Solar Feasibility Study: Complete Process from Site Assessment to DPR
By AlgEnergy Engineering Consultancy Services | Technical Guide | Updated October 2026
Introduction: Why Every Successful Solar Project Starts with a Feasibility Study
A solar power project is more than an investment in photovoltaic modules, inverters, mounting structures and electrical infrastructure. It is a long-term engineering and financial commitment that requires careful evaluation of land suitability, solar irradiation, energy generation potential, grid connectivity, capital expenditure, operating costs and project risks.
Before investing in a commercial rooftop installation, industrial captive solar power plant, utility-scale solar farm or solar-plus-battery energy storage system, project developers must establish whether the proposed investment is technically achievable, commercially viable and financially sustainable.
This is where a solar feasibility study becomes essential.
A comprehensive solar feasibility study provides a structured technical and economic evaluation of a proposed solar energy project. It examines site conditions, solar resource availability, photovoltaic system configuration, annual energy yield, engineering requirements, regulatory considerations, capital costs, operating expenses, project risks and financial returns.
For industrial owners, renewable energy developers, EPC contractors, independent power producers (IPPs), investors and financial institutions, the feasibility report becomes an important foundation for project approval and investment decisions.
A well-prepared feasibility study answers several critical questions:
Is the proposed site technically suitable for solar PV development?
What solar PV capacity can realistically be installed?
How much electricity will the project generate annually?
What will be the estimated capital and operating costs?
Which technology and system configuration are appropriate?
What grid infrastructure and statutory approvals will be required?
Is the project financially attractive under realistic assumptions?
What technical, environmental, regulatory and commercial risks must be addressed?
Can the project progress to a Detailed Project Report (DPR), tendering and implementation?
AlgEnergy Engineering Consultancy Services, based in New Delhi, India, provides multidisciplinary project feasibility, engineering planning, techno-economic analysis and DPR preparation services for renewable energy, power, industrial and infrastructure projects.
Our approach connects technical evaluation with practical project implementation requirements, helping developers and investors establish a stronger foundation before committing significant capital.
For an overview of our capabilities, visit AlgEnergy Engineering Consultancy Services or explore our engineering feasibility and project planning services.
1. What Is a Solar Feasibility Study?
A solar feasibility study is a systematic assessment of the technical, environmental, regulatory, commercial and financial viability of a proposed solar photovoltaic power project.
Its primary purpose is to determine whether a project should proceed, be modified, undergo further investigation or be discontinued before substantial development expenditure is incurred.
The study integrates multiple engineering disciplines and commercial evaluations into a single decision-making framework.
1.1 Technical feasibility
Technical feasibility determines whether the proposed solar PV installation can be designed, constructed, connected to the electricity network and operated reliably.
The assessment normally includes solar resource evaluation, land or rooftop suitability, electrical infrastructure, preliminary PV layout, technology selection, structural requirements, environmental conditions and grid connectivity.
A technically feasible project must demonstrate that its proposed configuration can operate within the physical and regulatory constraints of the selected location.
For example, a site may have excellent solar irradiation but limited transmission capacity. Another site may offer convenient grid access but require expensive earthworks or flood protection.
Both factors can significantly affect project feasibility.
1.2 Economic feasibility
Economic feasibility evaluates the expected project costs relative to the economic benefits of electricity generation.
The analysis considers capital expenditure (CAPEX), operating expenditure (OPEX), energy production, electricity tariffs, avoided electricity purchases, financing assumptions, asset replacement costs and long-term project performance.
Typical economic indicators include levelized cost of energy (LCOE), net present value (NPV), internal rate of return (IRR), debt service coverage ratio (DSCR) and payback period.
1.3 Commercial feasibility
Commercial feasibility determines whether the proposed project has a realistic route to generating revenue or delivering energy savings.
For a utility-scale project, this may involve evaluating a power purchase agreement (PPA), merchant electricity market exposure or competitive tariff requirements.
For an industrial captive solar installation, commercial feasibility depends on electricity consumption, load profile, self-consumption potential, applicable grid charges and electricity tariff savings.
For a third-party open-access solar project, the analysis may also examine wheeling charges, banking arrangements, transmission charges and applicable contractual obligations.
1.4 Environmental and regulatory feasibility
Solar projects may require environmental screening, land-use permissions, construction approvals, electrical safety clearances and grid interconnection approvals.
Requirements vary by jurisdiction, project capacity, land classification, voltage level and development model.
A solar project feasibility report should identify applicable approvals, responsible authorities, potential compliance risks and indicative approval timelines.
1.5 Financial feasibility
Financial feasibility examines the project's ability to generate sufficient cash flow to meet operational expenses, debt obligations and investor return expectations.
The analysis should include alternative financing structures, sensitivity scenarios, potential cost escalation and realistic performance assumptions.
For debt-financed projects, lenders may require an independent technical review, energy yield assessment, financial model and additional due diligence.
A solar feasibility study therefore serves as the technical and commercial bridge between a project concept and an investment decision.
2. Why Is a Solar Feasibility Study Important?
Solar power plants are generally designed for operating lives extending over multiple decades. Decisions made during the feasibility stage can influence energy production, operating costs, maintenance requirements and project profitability throughout that period.
Skipping proper feasibility assessment can expose developers to avoidable technical and financial risks.
2.1 Prevents unsuitable project selection
Not every available land parcel or industrial rooftop is suitable for solar PV development.
A solar site assessment may reveal shading obstructions, weak soil conditions, inadequate rooftop load capacity, seasonal flooding, restricted land use or expensive grid interconnection requirements.
Identifying these constraints before land acquisition or equipment procurement can prevent substantial losses.
2.2 Improves solar PV system sizing
Solar PV capacity should not be selected solely according to available space.
The optimum installed capacity depends on site geometry, energy consumption, export limitations, grid availability, equipment configuration and project economics.
For example, an industrial facility with a high daytime electricity load may benefit from a system designed primarily for self-consumption.
A facility with limited daytime demand may require export arrangements, energy storage or a smaller solar installation.
2.3 Provides realistic energy generation estimates
Solar resource assessment and energy yield modeling estimate how much electricity the proposed plant can generate.
These estimates influence revenue projections, financial models, PPA negotiations and financing decisions.
A feasibility study should consider losses caused by temperature, soiling, shading, wiring, inverter conversion, equipment availability and other project-specific factors.
2.4 Supports investment and financing decisions
Investors need a reliable basis for evaluating project economics.
A structured feasibility report helps stakeholders understand estimated project cost, expected generation, financial returns, major risks and sensitivity to changes in key assumptions.
For larger projects, the feasibility study can support subsequent lender due diligence, although it does not automatically constitute a bankable assessment.
2.5 Reduces engineering changes
Early identification of site limitations, electrical infrastructure requirements and major equipment interfaces can reduce redesign during detailed engineering.
This can improve project scheduling, procurement planning and coordination between the owner, consultant, EPC contractor and equipment suppliers.
2.6 Supports regulatory and grid planning
Solar projects depend on location-specific rules governing grid interconnection, electrical safety, land use and power sales.
Early regulatory assessment helps developers identify approvals that may influence the project's development schedule.
For Indian solar projects, relevant policies and technical requirements should be checked through the Ministry of New and Renewable Energy (MNRE) solar policies and guidelines and applicable state and utility authorities.
The scope of a solar project feasibility study depends on the project's scale, business model, location and technical complexity.
3.1 Industrial rooftop solar projects
Industrial rooftop solar systems are installed on factory buildings, warehouses, logistics centers, manufacturing facilities and commercial structures.
Their feasibility assessments typically focus on rooftop structural capacity, roof condition, shading, available installation area, electrical load profiles, fire safety, cable routing and grid interconnection.
Special attention must be given to structural loading, wind uplift, maintenance access, waterproofing and safe installation procedures.
3.2 Commercial and institutional solar installations
Commercial buildings, educational institutions, hospitals, offices, shopping centers and public facilities may use solar PV to reduce electricity purchases.
Feasibility studies should assess operating hours, tariff structure, available roof area, load variation, system ownership options and applicable energy export arrangements.
Where uninterrupted power supply is important, the study may also examine integration with existing diesel generators, UPS systems and battery storage.
3.3 Utility-scale solar power plants
Utility-scale solar projects generally require more extensive technical investigations.
These may include land surveys, geotechnical studies, hydrological assessment, solar resource modeling, transmission studies, preliminary electrical design, environmental screening and long-term financial analysis.
Grid evacuation infrastructure can be a major cost and schedule driver.
For utility-scale solar farms, the feasibility study should assess both the solar generation facility and the infrastructure needed to deliver electricity to the designated interconnection point.
3.4 Captive and group captive solar projects
Captive solar projects supply electricity primarily to designated industrial or commercial consumers.
The feasibility study should evaluate the applicable captive structure, consumer load, generation profile, grid charges, regulatory eligibility, energy accounting and commercial arrangements.
Group captive projects require additional evaluation of ownership and consumption requirements under the relevant jurisdiction's regulations.
3.5 Floating solar photovoltaic projects
Floating solar PV systems are installed on suitable water bodies, including reservoirs and industrial ponds.
Their feasibility studies require evaluation of water-level variation, anchoring and mooring arrangements, wind and wave conditions, corrosion exposure, environmental constraints, electrical routing and operational access.
Floating solar development may offer land-use advantages, but it introduces engineering challenges that differ from conventional ground-mounted systems.
3.6 Solar-plus-BESS hybrid projects
Solar-plus-battery energy storage system projects combine photovoltaic generation with electrical energy storage.
A feasibility assessment should consider battery capacity, discharge duration, charge-discharge cycles, degradation, round-trip efficiency, fire safety, energy management strategy and grid operating requirements.
Battery storage may support peak shifting, renewable energy firming, backup power or participation in electricity markets, depending on local regulations.
The feasibility model must evaluate whether the expected benefits justify the additional capital and operating costs.
4. Complete Solar Feasibility Study Process: Step by Step
Site assessment
Solar resource analysis
System design and yield
CAPEX and OPEX
Financial and risk analysis
Feasibility report and DPR
A professional solar feasibility study follows a systematic sequence of technical investigations, design evaluations and commercial assessments.
Although individual projects may require different levels of detail, the following methodology provides a practical framework for industrial and utility-scale solar PV developments.
5. Step 1: Project Definition and Initial Data Collection
The first stage is to establish the project's objectives, boundaries and available information.
Before conducting detailed engineering studies, the solar engineering consultant must understand why the project is being developed and what success means to the owner.
5.1 Understanding the project objectives
The objectives may include reducing industrial electricity costs, supplying power under a long-term PPA, meeting renewable energy procurement requirements, developing a merchant solar plant or improving energy security.
Each objective leads to different technical and financial design considerations.
For example, a captive industrial solar project may prioritize daytime electricity savings, whereas a utility-scale PPA project may prioritize contracted annual energy delivery and long-term project cash flow.
5.2 Collecting site information
The initial data collection exercise should identify the site location, geographic coordinates, available land area, site ownership status, topography, access roads and existing infrastructure.
For rooftop projects, additional information should include structural drawings, roof dimensions, roof age, roofing materials and available electrical infrastructure.
For ground-mounted solar plants, land records, site boundaries, survey information and preliminary geotechnical data are important inputs.
5.3 Collecting electricity consumption data
For captive and commercial solar installations, the consultant should review electricity bills and, where available, interval meter data.
Monthly electricity consumption alone may not be sufficient to optimize solar capacity.
Hourly or sub-hourly demand information can help identify daytime consumption, peak demand, seasonal variations, weekend loads and potential export limitations.
5.4 Establishing the design basis
The design basis should document key project assumptions, including proposed plant capacity, grid voltage, operating model, design life, performance requirements and applicable standards.
A clear design basis helps prevent inconsistencies between technical calculations, equipment selection and financial modeling.
Typical deliverable: Project inception note, data gap register, preliminary design basis and feasibility study work plan.
6. Step 2: Solar Site Assessment and Land Suitability Analysis
A solar site assessment evaluates whether the proposed location can physically accommodate a solar power plant.
Site suitability affects plant layout, civil engineering requirements, construction costs, generation performance and operational reliability.
6.1 Geographic location and accessibility
The assessment should consider the site's coordinates, elevation, surrounding development, road access and distance from major infrastructure.
Poor site accessibility may increase the cost of transporting solar modules, mounting structures, transformers and construction equipment.
For remote projects, the feasibility study may need to evaluate temporary access roads, construction logistics and worker accommodation.
6.2 Topographical assessment
Topography influences module layout, drainage, foundations, cable routing and construction requirements.
A relatively level site may simplify construction, but even flat terrain can have drainage or soil-related challenges.
Steep or irregular land may require customized mounting arrangements, increased spacing or earthworks.
A topographical survey can provide contour data, elevation information, boundaries and existing physical features.
6.3 Geotechnical investigation
Ground-mounted solar PV structures must be designed for applicable structural loads and soil conditions.
Geotechnical investigations may evaluate soil bearing capacity, groundwater conditions, corrosion potential, soil stratification and foundation suitability.
The results influence the selection of driven piles, screw piles, concrete foundations or other support arrangements.
6.4 Flooding and drainage
Flood risk should be assessed using available hydrological records, site elevation, drainage patterns and local rainfall information.
Solar installations in flood-prone locations may require raised electrical equipment, improved drainage, erosion protection or alternative site layouts.
Ignoring drainage conditions can lead to foundation instability, access problems and damage to electrical equipment.
6.5 Environmental constraints
The assessment should identify potential environmental and social constraints, including protected habitats, vegetation removal, water resources, community access, cultural heritage and sensitive land uses.
For international projects, environmental and social due diligence requirements may be influenced by lender standards and national legislation.
6.6 Rooftop structural assessment
For rooftop installations, structural adequacy is a critical requirement.
The engineering assessment should consider dead loads, wind loads, mounting systems, roof condition and maintenance access.
Existing structural drawings should be reviewed where available, and additional investigations may be required to establish the building's load-bearing capacity.
Typical deliverable: Solar site assessment report, preliminary site constraints plan, survey requirements and recommendations for further investigation.
7. Step 3: Solar Resource Assessment and Irradiation Analysis
Solar resource assessment is one of the most important components of a solar feasibility study because it provides the foundation for estimating energy production.
Solar irradiation varies according to geographic location, atmospheric conditions, cloud cover, seasonal patterns and local environmental characteristics.
7.1 Understanding solar irradiation
Solar irradiation represents the solar energy received over a defined area during a specified period.
Common solar resource parameters include:
Global Horizontal Irradiance (GHI): Solar irradiance received by a horizontal surface, including direct and diffuse components.
Direct Normal Irradiance (DNI): Direct solar irradiance measured on a surface perpendicular to the incoming solar beam.
Diffuse Horizontal Irradiance (DHI): Solar irradiance received from the sky after atmospheric scattering, excluding the direct solar beam.
Plane-of-Array Irradiance (POA): Solar irradiance incident on the tilted or tracking surface of the photovoltaic modules.
For most conventional PV projects, GHI and POA irradiation are particularly relevant.
7.2 Solar resource data sources
Solar resource studies may use satellite-derived datasets, ground measurement stations, meteorological records and specialized modeling tools.
Recognized technical resources include the NREL PVWatts Calculator and NREL System Advisor Model.
PVWatts estimates electricity generation for grid-connected PV systems, while SAM supports more detailed performance and financial modeling.
For investment-grade assessments, reliance on a single representative weather year may be insufficient.
Long-term resource assessment should consider interannual variability, data uncertainty and the representativeness of available weather records.
Where appropriate, ground measurements may be used to validate or adjust satellite-derived data.
7.4 Seasonal irradiation variation
Monthly irradiation profiles help explain expected seasonal changes in electricity generation.
For example, monsoon conditions can reduce generation during certain months in parts of India, while high module temperatures can reduce conversion efficiency during hot seasons.
These effects must be considered in energy yield modeling.
7.5 Solar resource uncertainty
No solar resource dataset is perfectly accurate.
A feasibility report should identify the data source, observation period, spatial resolution, known limitations and applicable uncertainty assumptions.
This is particularly important when the results will be used for project financing.
Typical deliverable: Solar resource assessment report, monthly irradiation profile, weather dataset evaluation and resource uncertainty statement.
8. Step 4: Solar PV Capacity Optimization and Preliminary Plant Layout
Once site suitability and solar resource conditions have been evaluated, the consultant develops preliminary system configurations.
The objective is not simply to maximize installed PV capacity. It is to identify a technically practical and economically attractive configuration.
8.1 Determining available installation area
Usable installation area differs from gross site area.
Ground-mounted projects require space for internal roads, equipment stations, setbacks, drainage, transmission infrastructure and maintenance access.
Rooftop projects require allowances for obstructions, access pathways, safety requirements and shading zones.
The final installed capacity depends on module dimensions, mounting geometry, row spacing and electrical configuration.
8.2 Selecting fixed-tilt or tracking systems
Fixed-tilt structures offer relatively simple mechanical arrangements and maintenance requirements.
Single-axis trackers can increase energy capture under suitable conditions but introduce additional mechanical systems, land-layout considerations and maintenance needs.
Technology selection should be based on energy gain, equipment cost, site characteristics, wind conditions and lifecycle economics.
8.3 Module orientation and tilt
PV module orientation and tilt affect solar energy capture.
The optimum configuration depends on latitude, solar resource distribution, shading, structural constraints and project objectives.
For some commercial rooftop projects, an east-west configuration may allow greater installed capacity and a different daily generation profile compared with a conventional south-facing arrangement in the Northern Hemisphere.
The final selection should be supported by simulation rather than general assumptions.
8.4 DC-to-AC capacity ratio
The DC-to-AC ratio compares the installed photovoltaic module capacity with the inverter AC capacity.
A higher ratio can improve inverter utilization during lower-irradiance periods, but may increase clipping losses during peak production.
The optimum ratio depends on climate, module characteristics, inverter costs, electricity tariff structure and grid export limits.
8.5 Preliminary layout development
The preliminary layout should identify PV array blocks, inverter locations, transformer stations, internal roads, cable corridors, switchyards and grid connection interfaces.
It should also consider construction access, equipment replacement and future maintenance requirements.
Typical deliverable: Preliminary solar PV layout, capacity optimization assessment, equipment configuration and initial design assumptions.
9. Step 5: Solar Energy Yield Assessment
A solar energy yield assessment estimates the electrical energy that the proposed solar plant is expected to generate.
It is one of the most commercially important deliverables because projected energy production directly influences revenue, savings and financial returns.
9.1 Energy yield simulation
Solar energy modeling uses meteorological data, PV module characteristics, inverter parameters, array geometry and loss assumptions to estimate electricity generation.
Commonly used tools include PVsyst, PVWatts and SAM.
For detailed project assessments, modeling should reflect the proposed equipment and site conditions as closely as practical.
9.2 Major energy losses
Typical solar PV system losses include module temperature losses, soiling, shading, mismatch, DC cable losses, inverter conversion losses, AC cable losses, transformer losses, equipment downtime and grid curtailment.
Loss assumptions should be individually justified to avoid double counting or unrealistic generation forecasts.
9.3 Performance ratio
The performance ratio (PR) indicates how effectively a PV system converts the available in-plane solar irradiation into usable electricity relative to its nominal DC capacity.
A simplified expression is:
Where:
\(E_{AC}\) = measured or modeled AC energy over the assessment period
\(P_{STC}\) = installed DC module capacity at standard test conditions
\(H_{POA}\) = plane-of-array irradiation
\(G_{STC}\) = reference irradiance of 1 kW/m²
The measurement boundary and treatment of availability, curtailment and other exclusions should be defined consistently.
9.4 Specific energy yield
Specific energy yield expresses annual energy production per unit of installed DC capacity.
For example, a hypothetical 10 MWp solar plant producing 16,500 MWh annually has a specific yield of:
This value is illustrative and should not be interpreted as a guaranteed yield for a particular location.
9.5 P50 and P90 generation estimates
For projects requiring financing, energy yield assessments may include probabilistic generation estimates.
P50 represents an annual generation level with an estimated 50% probability of being exceeded under the stated model.
P90 represents a more conservative level with an estimated 90% probability of being exceeded.
These values depend on resource variability, model uncertainty and the assumptions used in the probabilistic assessment.
They are not guarantees of future performance.
9.6 Degradation and lifetime generation
PV module output generally declines over time due to degradation.
Lifetime generation forecasts should account for manufacturer-specific degradation assumptions, equipment replacements, system availability and other relevant operating factors.
Typical deliverable: Annual and monthly generation estimates, energy loss diagram, specific yield, performance ratio, uncertainty assessment and lifetime production forecast.
10. Step 6: Electrical Engineering and Grid Connectivity Assessment
Grid connectivity can determine whether an otherwise attractive solar project is commercially viable.
The electrical feasibility study evaluates how the proposed generation facility will connect to existing electrical infrastructure.
10.1 Grid connection point
The consultant should identify potential points of interconnection, relevant voltage levels, connection distances and preliminary infrastructure requirements.
The assessment may consider the availability of nearby substations, transmission lines or distribution feeders.
However, physical proximity to a substation does not establish available grid capacity.
10.2 Electrical infrastructure requirements
Depending on project scale, the proposed installation may require inverters, transformers, medium-voltage switchgear, protection systems, metering, cables, substations and transmission infrastructure.
The feasibility study should develop a preliminary single-line diagram and identify major electrical equipment.
10.3 Grid impact studies
The utility or system operator may require studies covering load flow, short circuit levels, voltage regulation, power quality, harmonics, protection coordination and dynamic behavior.
The scope depends on the interconnection voltage, project capacity and applicable grid code.
10.4 Evacuation system cost
For utility-scale projects, transmission infrastructure may represent a significant component of total project expenditure.
A site with strong solar resources may become less attractive if the required evacuation line, right-of-way acquisition or substation upgrades are expensive.
10.5 Grid curtailment risk
Grid congestion and operating restrictions can reduce the electricity exported by a solar power plant.
Where curtailment is a credible risk, the feasibility model should consider its impact on net energy delivery and revenue.
Typical deliverable: Preliminary electrical single-line diagram, grid connectivity assessment, evacuation concept and interconnection risk register.
11. Step 7: Solar Project CAPEX Estimation
Capital expenditure estimation is a critical component of a solar techno-economic feasibility study.
The objective is to estimate the total investment required to develop, construct, connect and commission the proposed solar power plant.
A preliminary CAPEX estimate should be based on the proposed engineering configuration, available market information, project location, construction requirements and procurement strategy.
11.1 Major CAPEX components
A comprehensive solar project cost estimate may include the following components:
Cost component | Scope of assessment |
|---|---|
Solar PV modules | Module procurement, transportation and warranties |
Inverters | String or central inverters and associated equipment |
Mounting structures | Fixed-tilt or tracker systems and foundations |
Civil works | Site preparation, roads, drainage and fencing |
DC electrical system | DC cables, connectors, combiner equipment |
AC electrical system | Transformers, switchgear, cables and protection |
Grid evacuation | Substation, transmission line and interconnection |
Monitoring and SCADA | Plant monitoring, data acquisition and communications |
Engineering and PMC | Design, consultancy and construction supervision |
Statutory approvals | Permits, inspections and applicable fees |
Contingency | Allowance for identified and residual uncertainties |
Development and financing | Land, development expenses and applicable financing costs |
11.2 Equipment selection and lifecycle value
Selecting equipment solely on the basis of the lowest purchase price may lead to higher lifecycle costs.
A solar feasibility study should compare equipment options considering efficiency, degradation, reliability, warranty conditions, availability of technical support and replacement requirements.
For example, higher-efficiency modules may reduce mounting structure and land requirements for a specified DC capacity, but their commercial value depends on the actual price premium and site constraints.
Similarly, selecting central or string inverters requires consideration of maintenance strategy, redundancy, installation layout and expected energy losses.
11.3 Preliminary versus detailed cost estimates
Cost estimate accuracy generally improves as engineering information becomes more detailed.
At the pre-feasibility stage, costs may be developed using benchmarks, preliminary quantities and budgetary assumptions.
At the detailed feasibility or DPR stage, the estimate can be refined using equipment specifications, bills of quantities, vendor budget quotations and defined construction requirements.
The estimate should clearly state its basis, exclusions, currency, reference date and uncertainty range.
11.4 International project cost considerations
For solar projects outside India, CAPEX analysis should reflect local labor costs, import duties, taxation, transportation, grid requirements, applicable engineering standards and construction conditions.
Currency fluctuations and procurement lead times may also affect the investment estimate.
International developers using engineering design outsourcing from India should ensure that preliminary engineering assumptions are checked against local codes and approval requirements.
Typical deliverable: Itemized preliminary CAPEX estimate, estimate basis, equipment cost comparison and project contingency assessment.
12. Step 8: Solar Project OPEX and Lifecycle Cost Assessment
Operating expenditure includes the recurring costs required to operate and maintain the solar power plant.
Although solar PV installations do not require fuel for electricity generation, they still incur maintenance, asset management, insurance and other operating expenses.
12.1 Operation and maintenance costs
Typical O&M activities include preventive maintenance, inverter servicing, module cleaning, vegetation management, electrical testing, inspection and performance monitoring.
The cost depends on project capacity, location, equipment configuration, service contracts and operating conditions.
12.2 Module cleaning and soiling
Dust, pollution, bird droppings and other deposits can reduce PV module output.
The feasibility assessment should consider expected soiling losses, water availability, cleaning frequency, labor costs and potential automated cleaning systems.
For water-constrained locations, cleaning strategy can become an important engineering and operational consideration.
12.3 Equipment replacement
Some equipment may require major servicing or replacement before the end of the project's operating life.
The financial model should include realistic assumptions for inverter replacement, transformer maintenance, monitoring system upgrades and other significant lifecycle expenses.
12.4 Insurance and asset management
OPEX may include property insurance, liability insurance, security, asset management fees, land lease payments and applicable taxes.
The treatment of these costs should match the project's ownership and contractual structure.
12.5 Long-term cost escalation
Operating expenses can increase due to inflation, labor costs, spare parts and service contract escalation.
A reliable solar project financial model should incorporate appropriate escalation assumptions and distinguish between nominal and real cash flows.
Typical deliverable: Annual OPEX forecast, lifecycle maintenance plan, equipment replacement schedule and operating cost assumptions.
13. Step 9: Solar Techno-Economic Feasibility Study
A solar techno-economic feasibility study combines engineering performance estimates with capital and operating cost assumptions.
Its purpose is to determine whether the proposed solar configuration offers an acceptable economic outcome.
13.1 Levelized cost of energy
The levelized cost of energy is a widely used metric for comparing electricity generation costs.
A simplified discounted LCOE expression is:
Where:
\(CAPEX_0\) = initial capital investment
\(OPEX_t\) = annual operating expenditure
\(R_t\) = replacement and other included costs
\(E_t\) = annual electricity generation
\(r\) = discount rate
\(n\) = project evaluation period
Any residual value, tax treatment, financing costs or other model-specific items must be handled consistently with the chosen LCOE methodology.
LCOE is useful for cost comparison but does not independently establish whether a project is profitable.
13.2 Net present value
Net present value measures the discounted value of expected project cash flows after considering the initial investment.
A positive NPV indicates that the project generates value above the assumed discount rate, provided the underlying forecasts are achieved.
13.3 Internal rate of return
Internal rate of return is the discount rate at which the net present value of a defined series of cash flows equals zero.
The feasibility model should distinguish between project IRR and equity IRR.
Project IRR assesses returns before the effects of financing structure, while equity IRR considers cash flows attributable to equity investors.
13.4 Payback period
Payback period estimates how long it takes to recover the initial investment through project cash flows.
Simple payback can provide a quick indication of investment recovery but does not account for the time value of money.
Discounted payback is more appropriate when the objective is to consider the timing of cash flows.
13.5 Debt service coverage ratio
For debt-financed projects, DSCR measures the relationship between cash flow available for debt service and scheduled debt obligations.
Lenders may assess DSCR under base-case and downside scenarios.
13.6 Sensitivity analysis
Financial results should not be presented as a single guaranteed outcome.
A comprehensive feasibility study examines how returns change when key assumptions vary.
Typical sensitivity variables include project CAPEX, electricity tariff, annual energy yield, OPEX, financing costs, construction delays and module degradation.
For international projects, currency exchange rates and country-specific commercial risks may also be important.
13.7 Scenario analysis
A useful feasibility report may compare conservative, base-case and optimistic scenarios.
The scenarios should be internally consistent and clearly explain the underlying assumptions.
For example, a conservative scenario might combine lower energy generation with higher construction costs and a delayed commissioning date.
Such analysis helps investors understand potential downside exposure before making a final investment decision.
14. Illustrative Solar Feasibility Calculation for a 10 MWp Project
The following example demonstrates how a preliminary solar project feasibility model can be structured.
Illustrative assumptions only. These figures are not a current market quotation, site-specific estimate or investment guarantee.
Parameter | Illustrative value |
|---|---|
Installed solar PV capacity | 10 MWp DC |
Annual specific energy yield | 1,650 kWh/kWp |
First-year energy generation | 16.50 GWh |
Initial CAPEX | ₹40 crore |
First-year OPEX | ₹60 lakh |
Electricity realization | ₹4.00/kWh |
First-year gross revenue | ₹6.60 crore |
First-year revenue less OPEX | ₹6.00 crore |
Simple indicative payback | 6.67 years |
14.1 Annual energy calculation
Estimated first-year energy generation is 16.50 million kWh.
14.2 Revenue calculation
Estimated first-year gross revenue is ₹6.60 crore.
14.3 Simplified payback calculation
Assuming first-year revenue less OPEX of ₹6.00 crore:
This simplified calculation excludes financing costs, taxation, degradation, replacements, working capital, escalation and other relevant project-specific factors.
It should not be used as a substitute for a complete financial model.
14.4 Interactive sensitivity illustration
Use the following assumptions to explore how generation, electricity realization and capital cost influence a simplified payback estimate.
10 MWp solar project — simplified feasibility calculator
1,650 kWh/kWp
₹4.00/kWh
₹40 crore
A professional solar techno-economic feasibility study should replace these illustrative assumptions with verified site data, current equipment quotations, project-specific energy yield modeling and a detailed financial forecast.
15. Step 10: Solar Project Risk Assessment
Risk assessment is necessary to identify uncertainties that could affect project cost, schedule, generation and commercial performance.
The objective is not to eliminate every risk but to understand which risks are material and how they can be mitigated.
15.1 Technical risks
Technical risks may include incorrect resource assumptions, equipment underperformance, unexpected soil conditions, structural deficiencies, grid compatibility issues and excessive system losses.
Mitigation measures may include independent design reviews, site investigations, equipment qualification and detailed simulation.
15.2 Construction risks
Construction risks include schedule delays, material shortages, adverse weather, contractor performance, logistics challenges and inadequate site preparation.
A realistic implementation schedule should include major engineering, procurement, approval and construction dependencies.
15.3 Regulatory risks
Changes in electricity tariffs, open-access regulations, grid charges, equipment eligibility requirements and permitting conditions can influence project economics.
For projects in India, the applicable requirements should be reviewed through the relevant authorities, including the Ministry of New and Renewable Energy and state electricity regulators.
15.4 Financial and commercial risks
Financial risks include changes in interest rates, currency fluctuations, cost escalation, delayed payments, offtaker creditworthiness and revenue uncertainty.
The feasibility model should evaluate material commercial exposures and identify appropriate mitigation options.
15.5 Environmental and climate risks
Extreme wind, flooding, high temperatures, hail, corrosion and other site-specific hazards may affect plant design and long-term reliability.
Climate resilience should be incorporated into engineering decisions where these hazards are relevant.
15.6 Risk register
A professional feasibility report should include a risk register identifying each major risk, likelihood, potential impact, mitigation measure and responsible party.
This provides a practical framework for monitoring risks as the project advances.
16. Step 11: Regulatory Approvals and Statutory Compliance
Regulatory compliance is a fundamental consideration for solar project development.
The required approvals depend on the project location, installation type, grid voltage, capacity, land classification and electricity sales arrangement.
16.1 Solar feasibility study in India
For Indian projects, the regulatory review may include land-use requirements, electrical safety, grid connectivity, metering, open access, captive power provisions and applicable equipment standards.
Requirements vary by state and project category.
The feasibility consultant should identify the relevant regulatory authorities and prepare an approval matrix showing each required permission, application responsibility and expected project-stage dependency.
16.2 MNRE guidelines and equipment requirements
Indian solar projects may be subject to applicable MNRE policies and Approved List of Models and Manufacturers (ALMM) requirements.
Applicability must be checked against the latest notifications, procurement model, project category and commissioning conditions.
Developers can refer to the official MNRE ALMM information and updates for current requirements.
16.3 International solar project regulations
International solar projects must comply with the applicable national and local regulatory framework.
This may include land development permits, environmental approvals, electrical codes, grid interconnection procedures, occupational safety requirements and equipment certification.
For projects in Europe, the Middle East, Africa, Southeast Asia and the Americas, regulatory assessment should be undertaken with appropriate local expertise.
16.4 Compliance documentation
The feasibility report should identify the standards and regulations used in developing preliminary engineering assumptions.
It should also distinguish between approvals already obtained, approvals under application and approvals still required.
A feasibility study is not itself a statutory approval or authorization to construct.
17. Step 12: Solar Feasibility Report Preparation
The solar feasibility report consolidates the results of technical investigations, engineering evaluations, economic analysis and risk assessment.
It should present a clear recommendation supported by documented assumptions and evidence.
17.1 Recommended feasibility report structure
Chapter | Key contents |
|---|---|
Executive summary | Project concept, findings and recommendation |
Project background | Objectives, developer information and scope |
Site assessment | Location, land, topography and constraints |
Solar resource | Irradiation, meteorological data and uncertainty |
Technology selection | Modules, inverters and mounting configuration |
Preliminary engineering | Layout, capacity and electrical concept |
Energy yield | Generation forecast, losses and performance |
Grid connectivity | Interconnection and evacuation requirements |
CAPEX and OPEX | Cost estimates and lifecycle assumptions |
Financial analysis | LCOE, NPV, IRR and sensitivity |
Risk assessment | Technical, regulatory and commercial risks |
Implementation schedule | Project milestones and dependencies |
Conclusions | Feasibility findings and next steps |
17.2 Executive summary
The executive summary should explain whether the proposed project appears viable and identify the conditions required for implementation.
It should highlight the proposed plant capacity, expected annual generation, estimated investment, major constraints and recommended next steps.
17.3 Engineering assumptions
All major engineering assumptions should be traceable.
This includes resource datasets, equipment specifications, performance losses, cost assumptions, applicable codes and preliminary design criteria.
Transparent assumptions allow the project owner and independent reviewers to understand how the conclusions were developed.
17.4 Recommendations and decision gates
A useful solar feasibility report should conclude with a practical recommendation.
Possible outcomes include proceeding to DPR preparation, conducting additional site investigations, revising the proposed capacity, evaluating alternative locations or postponing the project.
The recommendation should reflect both technical feasibility and commercial viability.
18. From Solar Feasibility Study to Detailed Project Report (DPR)
A Detailed Project Report is often prepared after initial feasibility has established a viable project concept.
The solar project DPR develops the proposed project into a more detailed technical, commercial and implementation framework.
18.1 Solar feasibility study versus DPR
Parameter | Solar feasibility study | Solar project DPR |
|---|---|---|
Primary objective | Determine project viability | Define project implementation |
Site evaluation | Preliminary to detailed | Detailed and documented |
Plant layout | Conceptual or preliminary | More developed engineering layout |
Equipment selection | Technology options | Defined specifications |
Energy modeling | Feasibility-level forecast | Refined project model |
Cost estimation | Preliminary estimate | More detailed project estimate |
Financial evaluation | Investment screening | Detailed project financial analysis |
Project schedule | Indicative milestones | Developed implementation schedule |
Tender support | Limited | May include tender-ready inputs |
Main outcome | Investment decision support | Project execution planning |
The exact scope varies by client requirements and financing arrangements.
18.2 Key contents of a solar project DPR
A comprehensive DPR may include project objectives, design basis, survey findings, plant configuration, engineering calculations, technical specifications, electrical systems, civil and structural requirements, equipment schedules, bill of quantities, cost estimate, implementation schedule and financial analysis.
For larger projects, the DPR may also address grid evacuation, construction methodology, quality assurance, commissioning requirements and operational planning.
18.3 Importance of multidisciplinary engineering
Solar projects require coordination between electrical, civil, structural, mechanical, environmental and project management disciplines.
For example, the electrical layout influences cable routing and trench requirements. Module selection affects structural loading and mounting design. Grid connection requirements influence transformer and switchyard configuration.
An integrated engineering approach reduces inconsistencies between project disciplines.
18.4 Transition to tendering and detailed engineering
Once the DPR is approved, the project may progress to preparation of EPC tender documents, technical specifications, procurement packages, detailed engineering and construction planning.
AlgEnergy's published engineering service framework covers feasibility studies, DPR preparation, multidisciplinary engineering, tender support and project execution-related services.
Explore AlgEnergy's DPR preparation and detailed engineering consultancy services for related project development support.
19. Solar Feasibility Study for Industrial Projects
Industrial solar installations require a feasibility methodology that accounts for the interaction between photovoltaic generation and facility electricity consumption. Unlike utility-scale projects that primarily export electricity, industrial solar installations may derive their economic value from avoided electricity purchases.
19.1 Industrial electricity load assessment
An industrial solar feasibility study should begin with a detailed examination of the facility's electricity demand.
The analysis may cover production schedules, operating shifts, peak demand, seasonal consumption and future expansion plans.
A facility operating continuously may have a different optimum solar configuration from one operating only during daytime working hours.
19.2 Self-consumption optimization
Self-consumption represents the portion of solar electricity used directly by the facility.
Increasing self-consumption can improve project economics where avoided grid electricity costs exceed the compensation available for exported solar energy.
The optimum configuration depends on applicable tariffs, load patterns, metering rules and export arrangements.
19.3 Integration with existing electrical systems
Industrial facilities may operate transformers, captive power systems, diesel generators, UPS systems and multiple electrical distribution networks.
The solar engineering consultant should evaluate how the PV installation will interact with these systems.
Protection coordination, synchronization, reverse power flow, power quality and operational safety may require particular attention.
19.4 Industrial solar expansion planning
Some industrial owners prefer phased solar development.
A feasibility study can examine whether the initial design should accommodate future capacity additions, battery storage or expansion of the facility's electrical infrastructure.Phased development can be useful where electricity demand is expected to grow.
20. Solar Feasibility Study for International EPC Contractors and Developers
International solar developers increasingly require engineering consultancy support for project screening, preliminary design, energy modeling, cost estimation and tender preparation.
A solar project consultancy team can support these activities remotely, provided the project has access to reliable site data and suitable local engineering coordination.
20.1 Engineering design outsourcing from India
Engineering design outsourcing can provide international developers with additional technical capacity for feasibility studies, calculations, drawings, technical documentation and multidisciplinary engineering.
The commercial advantages may include flexible engineering resources, access to specialized skills and efficient preparation of standardized deliverables.
However, successful international engineering support requires clear scope definition, quality control, project communication and compliance with local requirements.
20.2 Solar consultancy for the Middle East
Solar projects in the UAE, Saudi Arabia and other Middle Eastern markets may require particular attention to high ambient temperatures, dust accumulation, soiling, cleaning water availability and equipment performance under severe environmental conditions.
Feasibility studies should evaluate these factors alongside grid requirements, project financing structures and local approval procedures.
20.3 Solar consultancy for Africa
Solar developments in African markets may include utility-scale grid-connected plants, industrial captive projects, mini-grids and solar-plus-storage systems.
Feasibility considerations can include grid reliability, infrastructure availability, currency exposure, land arrangements and project financing.
The technical study should be adapted to the specific country, utility and business model.
20.4 Solar consultancy for Southeast Asia
Solar projects in Southeast Asia may face site-specific challenges involving heavy rainfall, high humidity, flooding, typhoons, land constraints and grid integration.
Floating solar and solar-plus-BESS configurations may be relevant in some markets.
The feasibility methodology should consider local environmental conditions, electrical standards and commercial arrangements.
20.5 Solar consultancy for Europe and the USA
Projects in Europe and the United States may require detailed attention to local grid codes, permitting, environmental and land-use restrictions, electrical standards and financing requirements.
For international assignments, Indian engineering consultancy services can support technical analysis and design documentation, while locally licensed professionals should perform tasks requiring jurisdiction-specific authorization.
International developers seeking solar feasibility study services can contact AlgEnergy Engineering Consultancy Services India to discuss project-specific engineering requirements.
21. How to Select the Right Solar Feasibility and DPR Consultant
Selecting a solar engineering consultant should involve more than comparing consultancy fees.
The quality of the feasibility assessment can influence project configuration, cost estimates, risk identification and investment decisions.
21.1 Evaluate multidisciplinary engineering capabilities
Solar development requires expertise across several engineering disciplines.
The consultant should have access to appropriate capabilities for solar resource assessment, electrical engineering, civil and structural design, financial evaluation and project planning.
21.2 Review relevant project experience
Developers should request examples of comparable assignments.
Relevant experience may involve industrial rooftop solar, utility-scale solar, captive power, solar-plus-storage or project-specific DPR preparation.
The complexity and scope of completed work are often more informative than the total number of projects listed.
21.3 Examine modeling methodology
A professional solar feasibility consultant should explain the basis of energy yield calculations, resource data selection, equipment assumptions and loss modeling.
The study should clearly distinguish measured information from assumptions and estimates.
21.4 Check financial analysis capability
Technical generation forecasts must be integrated into a financial model that reflects the project's commercial structure.
The consultant should be able to explain cost assumptions, revenue calculations, financing scenarios and sensitivity results.
21.5 Review deliverable quality
The consultant's proposal should identify expected reports, drawings, calculations, models and review stages.
Clearly defined deliverables help avoid misunderstandings and additional costs during execution.
21.6 Evaluate communication and project management
International and multidisciplinary projects require consistent technical coordination.
Defined responsibilities, document control, review procedures and project schedules help improve delivery quality.
22. Why Consider AlgEnergy Engineering Consultancy Services?
AlgEnergy Engineering Consultancy Services is an India-based multidisciplinary engineering consultancy serving energy, renewable power, industrial and infrastructure projects.
The company's published service portfolio covers project feasibility studies, techno-economic assessment, DPR preparation, engineering design, technical specifications, tender documentation and project management-related support.
For solar developers and EPC contractors, an integrated consultancy approach can help maintain technical continuity from project concept through engineering and implementation planning.
22.1 Solar project feasibility and planning
A project-specific scope may include site evaluation, solar resource assessment, preliminary PV configuration, energy yield modeling, cost estimation, financial analysis and feasibility reporting.
22.2 Detailed Project Report preparation
DPR support can include development of engineering assumptions, technical documentation, preliminary drawings, equipment specifications, cost estimates and implementation schedules.
22.3 Multidisciplinary engineering support
Solar projects often require electrical, civil, structural and associated infrastructure engineering.
Coordinating these disciplines within a common project framework can help reduce design interfaces and documentation inconsistencies.
22.4 Support for Indian and international clients
AlgEnergy can be considered by project owners, developers and EPC contractors seeking engineering consultancy support from India.
The scope, delivery schedule, required site investigations and applicable local professional approvals should be agreed for each assignment.
For further information, visit the AlgEnergy official website.
23. Information Required to Start a Solar Feasibility Study
A project owner can help accelerate the feasibility process by preparing basic project information before engaging a consultant.
Required information | Purpose |
|---|---|
Project location and coordinates | Solar resource and site assessment |
Proposed solar capacity | Initial system sizing |
Land or rooftop drawings | Layout and physical suitability |
Electricity bills and load profile | Captive solar optimization |
Existing electrical single-line diagram | Interconnection assessment |
Site photographs | Preliminary constraints review |
Topographical survey | Ground-mounted plant planning |
Grid connection information | Electrical feasibility |
Commercial project model | Financial analysis |
Target implementation schedule | Development planning |
Not every item must be available at the beginning.
A feasibility consultant can identify missing information and recommend the necessary surveys, investigations and studies.
24. Frequently Asked Questions About Solar Feasibility Studies
What is a solar feasibility study?
A solar feasibility study is a technical, commercial and financial assessment used to determine whether a proposed solar power project can be successfully developed and operated. It examines site suitability, solar resources, plant configuration, energy yield, investment costs, regulatory requirements and financial viability.
How much does a solar feasibility study cost in India?
The consultancy fee depends on project capacity, location, study complexity, required site investigations and expected deliverables. A preliminary rooftop feasibility assessment generally requires a different scope from a utility-scale project involving detailed resource analysis, surveys, grid studies and financial modeling. A project-specific proposal is the most reliable way to establish the cost.
How long does a solar feasibility study take?
The duration depends on the availability of site information, project complexity, survey requirements and client review cycles. A preliminary desktop assessment may be completed relatively quickly, while a detailed utility-scale feasibility study involving field investigations and third-party inputs can require substantially more time.
What is the difference between a solar feasibility study and a DPR?
A solar feasibility study evaluates whether a proposed project is viable. A Detailed Project Report develops the selected project concept into a more detailed technical, commercial and implementation framework. A DPR typically contains more developed engineering, equipment specifications, cost estimates and execution planning.
Is a solar feasibility study required for bank financing?
Lenders may require technical and financial feasibility documentation, but requirements differ by lender, project size and financing structure. Larger projects may require independent engineer reviews, detailed energy yield assessments and additional technical due diligence. A standard feasibility report is not automatically a bankable report.
Which software is used for solar energy yield assessment?
Commonly used tools include PVsyst, NREL PVWatts and the System Advisor Model. The appropriate tool depends on the required accuracy, project configuration, available data and purpose of the assessment.
What is a bankable solar feasibility study?
A bankable solar feasibility study is generally understood as a sufficiently detailed and credible assessment that supports lender evaluation. It should use defensible assumptions, reliable resource data, documented engineering, transparent financial analysis and appropriate uncertainty and risk assessments. Acceptance depends on the specific lender's requirements.
Can a solar feasibility study be conducted remotely?
Many activities, including preliminary solar resource analysis, desktop site assessment, energy modeling, layout development and financial analysis, can be performed remotely. However, site surveys, structural inspections, geotechnical investigations and certain grid assessments may require local specialists or fieldwork.
Does a solar feasibility study include P50 and P90 energy generation?
Detailed energy yield assessments may include P50 and P90 estimates where appropriate. Their preparation requires a suitable uncertainty methodology and adequate resource information. They should be specifically included in the consultant's scope if required for financing.
Can solar feasibility studies include battery energy storage?
Yes. Solar-plus-BESS feasibility studies can evaluate battery capacity, energy shifting, storage losses, degradation, grid services, operating strategy and lifecycle economics. The analysis should account for both technical performance and commercial benefits.
What is included in a solar site assessment?
A solar site assessment may include land suitability, rooftop condition, shading, topography, accessibility, geotechnical requirements, drainage, environmental constraints, electrical infrastructure and preliminary layout feasibility.
How is solar project profitability calculated?
Profitability is evaluated using projected energy generation, electricity revenue or savings, CAPEX, OPEX, financing assumptions, taxation and project life. Common indicators include NPV, IRR, LCOE, DSCR and payback period.
Can AlgEnergy support international solar project developers?
AlgEnergy offers multidisciplinary engineering consultancy and feasibility-related services. International developers can discuss project-specific solar engineering, feasibility and DPR requirements, including the division of responsibilities between remote engineering support and local licensed professionals.
25. Conclusion: Build a Strong Foundation Before Investing in Solar Power
A successful solar project begins with a clear understanding of technical feasibility, energy generation potential, engineering requirements, project costs and financial risks.
A comprehensive solar feasibility study helps project developers evaluate these factors before making major investment commitments.
From solar site assessment and irradiation analysis to PV system configuration, energy yield simulation, grid connectivity, CAPEX estimation, OPEX forecasting and financial evaluation, each stage contributes to informed project planning.
The transition from feasibility assessment to Detailed Project Report preparation provides a more developed foundation for engineering, tendering, procurement and implementation.
For industrial owners, EPC contractors, renewable energy developers and investors, selecting an appropriately qualified solar project consultant can improve decision-making and reduce avoidable development risks.
AlgEnergy Engineering Consultancy Services supports project development through feasibility assessment, engineering planning, DPR preparation and related multidisciplinary engineering services.
Whether the proposed development involves an industrial rooftop system, utility-scale solar farm, captive solar installation or solar-plus-BESS project, the first step is to establish a clear and defensible technical and commercial basis.
