Published: August 2026
Last Updated: August 2026

For businesses with high electricity consumption, a CAPEX solar power plant is a model where the company purchases and owns the solar system instead of paying a third-party developer to operate it. The business makes the initial capital investment and receives the financial benefit from lower electricity bills over the plant’s operating life.

For commercial and industrial businesses in Kerala, CAPEX solar can be particularly attractive because the value of the investment depends on factors such as electricity tariff, daytime consumption, available rooftop or land area, solar generation and the applicable grid-interconnection arrangement.

This guide explains how CAPEX solar works, what it costs, how ROI is calculated, the technical components involved, and what businesses should consider before installing a solar power plant.

What Is a CAPEX Solar Power Plant?

CAPEX stands for Capital Expenditure. In a CAPEX solar model, the business pays for the solar power plant and becomes its owner.

The investment normally covers:

• Solar PV modules
• Inverters
• Mounting structures
• DC and AC cabling
• Protection equipment
• Earthing and lightning protection
• Monitoring systems
• Installation and commissioning
• Electrical infrastructure
• Engineering and project management
• Applicable approvals and documentation

Once commissioned, the business generates electricity from the solar plant and uses it to reduce electricity purchased from the grid.

Unlike an OPEX or RESCO model, where a third party finances and owns the plant and sells electricity under an agreement, CAPEX gives the customer ownership of the solar asset.

How Does CAPEX Solar Work?

The typical CAPEX solar process involves five major stages:

1. Site and Energy Assessment

The EPC company evaluates the customer’s electricity consumption, sanctioned load, contract demand, electricity bills and operating pattern.

A technical site survey also checks:

• Available roof or land area
• Roof structure and load-bearing capacity
• Shading
• Orientation and inclination
• Electrical infrastructure
• Transformer capacity
• Cable routing
• Safety requirements

The proposed plant size should be based on both available solar resource and the customer’s actual electricity consumption.

2. System Design

The engineering team prepares the solar PV system design based on the site conditions and required system capacity.

For an industrial plant, this can include:

• Module layout
• String configuration
• Inverter selection
• DC/AC ratio
• Single-line diagram
• Cable sizing
• Earthing design
• Lightning protection
• Structural design
• Protection and isolation
• Grid-interconnection requirements

High-load factories may require a more detailed electrical study because the solar system has to operate alongside existing industrial loads and electrical infrastructure.

3. Procurement and Installation

After the technical and commercial proposal is approved, the solar modules, inverters, mounting structures and balance-of-system components are procured.

Installation can include rooftop structures, ground-mounted structures or other site-specific mounting solutions.

4. Grid Connection and Commissioning

For a grid-connected project in Kerala, the required application, technical feasibility, inspection, testing and interconnection processes must be completed with the relevant authorities.

KSEB operates a Solar Rooftop Portal for processing grid-connected rooftop PV applications. Its published process includes application, technical feasibility, registration, installation, project completion documentation, testing, agreement and meter installation.

5. Operation and Maintenance

After commissioning, the plant should be monitored regularly for energy generation, inverter performance, faults and abnormal performance.

Preventive maintenance can include:

• Module cleaning
• Electrical inspections
• Inverter inspection
• Thermographic inspection
• Cable and connector checks
• Earthing checks
• Performance monitoring
• Preventive replacement of selected components

CAPEX Solar Plant Cost

The cost of a CAPEX solar power plant depends on its capacity, technology, location, mounting arrangement, electrical infrastructure, module and inverter selection, civil work and project-specific requirements.

As an indicative 2026 market reference, published Indian C&I solar estimates place 500 kW–1 MW CAPEX projects around ₹35,000–₹40,000 per kW in some market segments, while other current estimates are higher depending on specifications and installation conditions. Therefore, a fixed “₹X per kW” figure should not be presented as a universal price.

Example CAPEX Calculation

Consider a hypothetical 500 kW industrial solar plant.

If the project quotation is assumed to be ₹40,000 per kW:

500 kW × ₹40,000 = ₹2 crore

This is only an illustrative calculation. The actual project quotation can change considerably based on site conditions, module technology, inverter configuration, structure, electrical upgrades, taxes and other project requirements.

For a proper investment decision, businesses should request a detailed EPC quotation rather than comparing only the price per kW.

What Does a CAPEX Solar Investment Include?

A commercial or industrial CAPEX proposal may include the following major cost components:

Component	Purpose
Solar PV modules	Convert sunlight into DC electricity
Inverters	Convert DC electricity into AC electricity
Mounting structure	Supports modules and withstands site conditions
DC cables	Connect PV modules to inverters
AC cables	Connect inverters to the electrical system
Protection equipment	Protects equipment from electrical faults
Earthing system	Provides electrical safety
Lightning protection	Protects the installation against lightning events
Monitoring system	Tracks generation and plant performance
Transformer/switchgear	Required where project design and grid configuration demand it
Installation	Mechanical and electrical installation
Engineering	System design and technical documentation
Commissioning	Testing and putting the plant into operation

The exact scope should be clearly defined in the EPC contract.

CAPEX Solar vs OPEX Solar

The main difference between CAPEX and OPEX solar is asset ownership and who makes the initial investment.

Factor	CAPEX	OPEX / RESCO
Initial investment	Customer	Third-party developer
Solar asset ownership	Customer	Developer
Electricity cost	Reduced grid purchase	Paid under PPA
Long-term asset value	Customer retains it	Usually remains with developer
Financing requirement	Higher initially	Lower upfront requirement
Control over system	Higher	Defined by agreement
Financial benefit	Customer captures solar savings	Shared through PPA pricing

CAPEX is generally more suitable for businesses that have the capital or financing capacity to purchase the system and want to retain the long-term economic benefits of owning the asset.

How Is Solar ROI Calculated?

The basic solar payback calculation is:

Payback Period = Total Solar Investment ÷ Annual Net Savings

For example, assume:

• Plant capacity: 500 kW
• Investment: ₹2 crore
• Annual solar generation: 700,000 kWh
• Effective avoided electricity cost: ₹8.50/kWh

Estimated annual electricity value:

700,000 × ₹8.50 = ₹59.5 lakh per year

Simple payback:

₹2 crore ÷ ₹59.5 lakh ≈ 3.36 years

This is an illustrative example, not a guaranteed ROI. Actual payback depends on generation, tariff, self-consumption, export settlement, degradation, O&M costs, downtime, financing cost and taxes.

A proper project feasibility study should therefore calculate both simple payback and a more complete financial model.

Tax and Depreciation Benefits

CAPEX solar is not only an electricity-saving investment. For eligible business owners, the solar plant can also have tax and depreciation implications.

The Income Tax Department’s current depreciation schedule lists solar power generating systems under renewable energy devices with a 40% depreciation rate. The actual tax benefit depends on the taxpayer, asset classification, applicable tax regime and other conditions, so the company’s tax advisor should confirm the treatment for the specific project.

This is why the financial evaluation of an industrial solar plant should consider more than the electricity-bill reduction alone.

Is CAPEX Solar Suitable for Industrial Businesses?

CAPEX solar can be particularly useful for businesses with:

• High daytime electricity consumption
• Large electricity bills
• Long-term ownership plans
• Available rooftop or land area
• Suitable electrical infrastructure
• Stable business operations
• Sufficient capital or access to financing

Typical applications include:

• Manufacturing facilities
• Food-processing units
• Warehouses
• Commercial buildings
• Hospitals
• Educational institutions
• Hotels
• Cold-storage facilities
• Engineering units
• High-load factories

The ideal plant capacity should not simply be based on the maximum available roof area. It should be matched with the customer’s load profile and the applicable grid-interconnection rules.

CAPEX Solar for Businesses in Kerala

For businesses in Kochi, Ernakulam and other parts of Kerala, the project design needs to account for local site and grid conditions.

A commercial solar EPC project may require coordination with KSEB, including application, technical feasibility, documentation, inspection, testing and meter-related procedures.

KSEB states that its rooftop solar net-metering framework allows a maximum capacity of 1 MWp at a single location under net metering, subject to the applicable rules and technical conditions. KSEB also specifies requirements relating to metering and compliance with applicable technical standards.

The applicable capacity, metering arrangement and approvals should always be confirmed during project planning because regulations and project conditions can change.

Does PM Surya Ghar Subsidy Apply to Industrial CAPEX Solar?

Businesses should not assume that the residential PM Surya Ghar subsidy applies to commercial or industrial CAPEX projects.

The MNRE guidelines for PM Surya Ghar specifically establish Central Financial Assistance for the residential sector.

For a commercial or industrial CAPEX project, the financial model should therefore primarily evaluate electricity savings, applicable tax/depreciation treatment, financing costs and project-specific incentives rather than assuming a residential subsidy.

Technical Factors to Check Before Installing a CAPEX Solar Plant

A proper technical feasibility study should examine the following.

Roof Structural Strength

Industrial rooftops must be checked for structural suitability before installing modules and mounting structures.

Shading Analysis

Nearby buildings, trees, tanks, exhaust systems and other structures can reduce solar generation. Shading analysis should be completed before finalizing the module layout.

Electrical Load

The solar plant must be designed around the facility’s existing electrical system, including:

• Connected load
• Contract demand
• Transformer capacity
• LT/HT connection
• Existing switchgear
• Load profile
• Protection systems

Module and Inverter Selection

Module technology, inverter capacity, efficiency, operating voltage range and environmental conditions should be evaluated together rather than selecting equipment purely based on brand or price.

Kerala Weather Conditions

Solar installations in Kerala need to be designed for heavy monsoon conditions, humidity and site-specific environmental exposure. Mounting structures, drainage, cable management and equipment protection should therefore be included in the engineering design.

What Documents Are Required?

The exact documentation varies according to the project and connection type, but a commercial solar project can involve:

• Electricity bills
• Consumer number
• Sanctioned load / contract demand details
• Site photographs
• Roof drawings
• Structural information
• Electrical single-line diagram
• Solar plant design
• Equipment specifications
• Project completion documents
• Electrical inspection documents
• Grid-interconnection documentation

KSEB publishes documentation and application information through its Solar Rooftop Portal.

CAPEX Solar Project: Typical Implementation Process

A commercial solar project can be structured as:

Site Survey → Energy Analysis → Feasibility Study → System Design → Financial Proposal → EPC Approval → Procurement → Installation → Testing → KSEB/Grid Approval → Commissioning → Monitoring & O&M

Each stage should have clearly defined responsibilities, documentation and approval milestones.

Why Businesses Choose CAPEX Solar

The major advantages include:

Lower Electricity Costs

Solar generation can reduce the amount of electricity purchased from the grid, particularly when the facility consumes substantial power during solar-generation hours.

Long-Term Asset Ownership

The company owns the solar plant and can benefit from its electricity generation over its operating life.

Predictable Energy Investment

Instead of relying entirely on future grid electricity prices, the company converts part of its energy expenditure into a long-term infrastructure investment.

Potential Tax Benefits

Eligible businesses may benefit from depreciation treatment applicable to solar power-generating systems, subject to prevailing tax rules and their individual circumstances.

Improved Sustainability Performance

A solar plant can also contribute to a company’s renewable-energy and sustainability objectives.

How to Choose a CAPEX Solar EPC Company

Price should not be the only factor when selecting an EPC contractor.

Businesses should evaluate:

• Engineering capability
• Previous industrial projects
• Installation experience
• Module and inverter specifications
• Structural engineering
• Electrical design
• KSEB approval experience
• Warranty terms
• O&M support
• Monitoring capabilities
• Project timeline
• Safety procedures
• After-sales service

TCM Solar has completed 500+ commercial and industrial solar installations across Kerala, including BrahMos Aerospace, Broad Bean Hotel and Janatha Charitable Society. Our in-house engineering/installations team manages site assessment, system design, installation and commissioning.

 

CAPEX Solar Project Case Studies

TCM Solar has delivered solar installations across commercial, institutional and industrial applications in Kerala. The portfolio includes projects ranging from smaller commercial systems to large-scale installations. The following projects demonstrate TCM Solar’s experience in designing and implementing solar power systems for organizations with significant electricity requirements.

1. BrahMos Aerospace – 1 MW

System Capacity: 1 MW

BrahMos Aerospace is one of the major industrial projects associated with TCM Solar, with a 1 MW solar power plant.

A project of this scale requires detailed engineering and planning across solar PV design, electrical infrastructure, mounting systems, protection equipment, grid integration and plant monitoring.

For a high-load industrial facility such as an aerospace manufacturing environment, the solar system must be designed around the site’s electrical load requirements and operating pattern rather than simply maximizing the available installation area.

Project Highlights:

• System capacity: 1 MW
• Project type: Industrial solar power plant
• Large-scale commercial and industrial application
• Engineered for high electricity consumption
• Requires detailed electrical and grid-integration planning
• Demonstrates TCM Solar’s capability in handling MW-scale projects

Important: Do not publish annual generation, percentage bill reduction, investment value or payback period for this project unless you have verified figures from the project records.

2. Janatha Charitable Society – 200 kWp

System Capacity: 200 kWp

TCM Solar’s portfolio includes a 200 kWp solar installation for Janatha Charitable Society. The project represents a larger institutional-scale solar application designed to generate renewable electricity and reduce dependence on grid power.

Project Highlights:

• 200 kWp solar power plant
• Institutional installation
• Large-scale rooftop solar application
• Designed for significant electricity consumption

3. Broad Bean Hotel – 125 kWp

Location: Thavakkara, Kannur
System Capacity: 125 kWp
Inverter: SolarEdge
PV Modules: MonoPerc Halfcut

TCM Solar installed a 125 kWp solar power plant at Broad Bean Hotel in Thavakkara, Kannur. The published portfolio identifies SolarEdge as the inverter technology and MonoPerc Halfcut as the PV module technology used for the project.

Hotels can have substantial daytime electricity consumption from air conditioning, lighting, kitchen equipment, refrigeration and other operational loads, making them suitable candidates for appropriately designed commercial solar systems.

Project Highlights:

• 125 kWp capacity
• Commercial hotel installation
• SolarEdge inverter
• MonoPerc Halfcut PV modules
• Location: Thavakkara, Kannur

4. Sabha Hospital – 100 kWp

Location: Taliparamba, Kannur
System Capacity: 100 kWp
Inverter: SolarEdge
PV Modules: Axitec

TCM Solar’s portfolio includes a 100 kWp solar installation at Sabha Hospital in Taliparamba, Kannur. The listed system uses SolarEdge inverters and Axitec panels.

Healthcare facilities can have significant electricity requirements from air conditioning, lighting, medical equipment and other essential loads. A properly engineered solar system can help offset suitable daytime electricity consumption.

Project Highlights:

• 100 kWp solar power plant
• Hospital installation
• SolarEdge inverter
• Axitec PV modules
• Location: Taliparamba, Kannur

5. Directorate of Technical Education – 60 kWp

Location: Pazhavangadi, Trivandrum
System Capacity: 60 kWp
Inverter: Fronius
PV Modules: MonoPerc Halfcut

The Directorate of Technical Education project in Pazhavangadi, Trivandrum, is listed in TCM Solar’s portfolio as a 60 kWp installation using Fronius inverters and MonoPerc Halfcut PV modules.

Project Highlights:

• 60 kWp solar power plant
• Government/institutional installation
• Fronius inverter
• MonoPerc Halfcut PV modules
• Location: Pazhavangadi, Trivandrum

Frequently Asked Questions

What is a CAPEX solar power plant?

A CAPEX solar power plant is a solar system purchased and owned by the business. The customer pays the initial capital cost and receives the financial benefits from electricity generated by the plant.

Is CAPEX solar better than OPEX?

CAPEX can be financially attractive for businesses that can invest upfront and want long-term ownership. OPEX can reduce the upfront investment because a third party owns and operates the plant.

How much does a CAPEX solar plant cost?

The cost depends on system size, modules, inverters, structures, electrical infrastructure, installation and site conditions. Current Indian commercial and industrial quotations vary significantly, so a site-specific EPC proposal is required.

What is the ROI of industrial solar in Kerala?

ROI depends on electricity tariff, solar generation, self-consumption, system cost and operating expenses. A site-specific financial model should be used instead of assuming a fixed payback period.

Can industrial consumers use net metering in Kerala?

KSEB’s published information allows net-metered rooftop systems up to 1 MWp at a single location, subject to applicable regulations and technical conditions.

Is PM Surya Ghar subsidy available for industrial solar?

The PM Surya Ghar Central Financial Assistance framework is for residential consumers. Commercial and industrial customers should not assume that the residential subsidy applies to their CAPEX solar project.

What size solar plant does a factory need?

The required capacity depends on electricity consumption, load profile, available roof area, sanctioned load or contract demand and the applicable grid-interconnection arrangement. An energy audit and site survey should be completed before selecting the capacity.

What is included in a CAPEX solar EPC project?

A typical EPC project can include engineering, solar modules, inverters, mounting structures, electrical equipment, cabling, protection systems, installation, commissioning, documentation and grid-interconnection support.

Conclusion

A CAPEX solar power plant is a long-term infrastructure investment that allows a commercial or industrial business to own its solar generation asset and reduce dependence on grid electricity.

For businesses in Kerala, the right project should combine accurate energy analysis, structural and electrical engineering, suitable solar equipment, KSEB compliance and a realistic financial model.

The most important number is not simply the price per kW. A proper CAPEX evaluation should consider the complete investment, expected generation, electricity tariff, self-consumption, operating costs, depreciation and the project’s expected payback.

For an accurate CAPEX proposal, the process should begin with an electricity-bill analysis and site feasibility study rather than a generic per-kW quotation.