Group Captive Solar in India Benefits, Cost & Eligibility Power is not a utility cost for Indian manufacturers and commercial businesses. It directly influences production costs, operating margins and long-term competitiveness. Businesses want more control over their energy spend, and group captive solar has come up as an alternative to buying all their electricity from discoms.
Unlike a conventional rooftop solar installation, a group captive arrangement allows multiple businesses to invest in a shared solar power plant and consume electricity generated by that facility.
However, group captive solar in India involves more than simply signing a power purchase agreement. Businesses must understand ownership requirements, annual electricity consumption obligations, open-access regulations, and the actual cost of delivered electricity.
This guide explains how the model works, who qualifies, what the investment involves, and how industrial consumers can evaluate its financial and operational suitability.
What Is Group Captive Solar?
Group captive solar is an electricity procurement model in which two or more eligible consumers collectively own an interest in a solar power plant and use its electricity for their own operations.
For example, Picture three manufacturers in Surat. One runs a textile processing unit, one a chemical plant and one a packaging line. Each has a heavy daytime load, and each has a roof too small to cover it. None wants to build and run a power project alone.
So, they do it together. They form a company, usually called an SPV, which builds one solar plant at a well-chosen site. Each factory owns a share of that company and takes power in proportion to its share. The electricity travels through the grid to each factory’s meter.
The key idea is ownership. Because the buyers are owners as well as customers, the law treats the plant as a captive generating plant, and that status carries real financial benefits.
Group Captive Solar Eligibility in India
Two tests decide whether a plant qualifies, and both sit in Rule 3 of the Electricity Rules, 2005. Captive users together must hold at least 26% of the plant’s ownership and consume at least 51% of the electricity it generates in a financial year. Engineers often call this the 26/51 test. lexology
What the 2026 amendment changed
The Ministry of Power notified the Electricity (Amendment) Rules, 2026 on 13 March 2026. This is the most important update for anyone planning a group captive project today, and many older blog posts do not reflect it. The changes are mostly in the buyer’s favour:
- The tests apply to the group as a whole. The 26% and 51% conditions are now checked on the aggregate of all captive users. Under the older approach, one member’s shortfall could expose an otherwise compliant member to surcharges. The new framework reduces that risk.
- Individual consumption has a cap. Each user’s consumption is capped at 100% of its proportionate entitlement, calculated from its ownership share. Consumption beyond the cap is treated as non-captive, with CSS and additional surcharge levied on it.
- Large holders are exempt from the cap. A captive user holding 26% or more is exempt from the proportionate consumption cap entirely. This gives an anchor investor much more flexibility.
- Group companies can count as one user. A company, along with its holding and subsidiary companies, can be treated as a single captive user. That helps businesses that run several units under one group.
Storage is recognised. Consumption through an energy storage system is now recognised as captive consumption. Solar combined with batteries is therefore easier to structure.
How Does the Group Captive Solar Model Work?
A group captive project connects electricity consumers, project investors, a solar generating facility, and the electricity network.
Group captive solar power flow
Illustrative structure; actual ownership, metering, and electricity settlement depend on the project and applicable regulations.
Step 1: Businesses join a shared solar project
Multiple commercial or industrial consumers participate in a solar project through an appropriate ownership structure. Their investment and contracted electricity allocation are determined by project requirements and applicable regulations.
Step 2: A solar power plant is developed
The project developer arranges land, engineering, procurement, construction, grid connectivity, and other necessary approvals. Ground-mounted projects are common where consumers require substantial electricity volumes.
Step 3: Electricity reaches consumers through open access
The solar plant generates electricity, which is scheduled, metered, and accounted for through the relevant electricity network. The consumers receive credit or settlement for eligible energy according to applicable state and central rules.
Step 4: Captive status is verified
Ownership and electricity consumption records are reviewed to establish whether the plant and participating consumers satisfy captive requirements.
Importantly, group captive solar does not guarantee uninterrupted electricity during a grid outage. Unless suitable backup or storage arrangements are provided, the factory
Understanding the ownership requirement
Participating captive consumers must collectively maintain the minimum qualifying ownership. This is not necessarily a requirement for every individual business to hold 26%.
Ownership documentation, voting rights, corporate relationships, and the SPV structure should be reviewed before the investment is finalised.
Understanding the consumption requirement
Captive users must collectively consume at least 51% of the qualifying plant's electricity generation over the financial year.
For example, if a qualifying solar plant generates 1 crore units in a financial year, at least 51 lakh units must be consumed for qualifying captive use.
The remaining electricity may be sold or otherwise dealt with under applicable commercial and regulatory arrangements.
Benefits of Group Captive Solar for Indian Industries
1. Potential reduction in electricity procurement costs
One of the main benefits of group captive solar is the opportunity to lower the effective cost of electricity.
Qualifying captive consumption can receive exemptions from cross-subsidy surcharge and additional surcharge, subject to the governing legal framework and compliance requirements.
However, transmission charges, wheeling charges, losses, scheduling charges, and other applicable costs may still affect the final landed tariff.
2. Reduced exposure to electricity tariff changes
A long-term solar procurement arrangement can provide greater visibility over part of a company's electricity expenditure.
The actual level of price certainty depends on the agreement's tariff structure, escalation provisions, open-access charges, and future regulatory changes.
3. Access to solar without sufficient rooftop space
Factories often have limited roof capacity because of structural restrictions, ventilation equipment, building layouts, or future expansion plans.
Group captive solar allows these businesses to procure solar electricity from an off-site project rather than relying exclusively on rooftop installations.
4. Shared project investment
Instead of independently developing an entire solar plant, participating companies can share ownership and investment obligations.
This can reduce the upfront equity commitment for an individual consumer, although the amount depends on the project valuation and commercial structure.
5. Support for sustainability objectives
Electricity procured from solar generation can support a business's renewable electricity strategy and emissions-reduction planning.
Businesses should ensure that renewable energy attributes, environmental claims, and any certificates are correctly allocated under their agreements and reporting standards.
6. Professional operation and maintenance
A professionally managed solar project can benefit from systematic performance monitoring, preventive maintenance, equipment inspection, and fault management.
These activities help protect energy generation and long-term asset performance.
What Is the Cost of a Group Captive Solar Project in India?
The total cost of group captive solar depends on the project's size, technology, land requirements, grid connectivity, financing structure, and state-specific charges.
Unlike a straightforward rooftop solar installation, the consumer's financial commitment usually includes both an ownership investment and recurring electricity procurement costs.
Main group captive solar cost components
|
Cost component |
What businesses should evaluate |
|
Equity investment |
Ownership contribution required for captive participation |
|
Solar project capital cost |
Modules, inverters, mounting structures, civil works, electrical systems and construction |
|
Energy purchase tariff |
Contracted electricity price and escalation conditions |
|
Transmission and wheeling |
Charges for using electricity networks |
|
Energy losses |
Applicable transmission and distribution losses |
|
Banking and settlement |
State-specific banking availability, charges and energy accounting |
|
O&M and insurance |
Maintenance, monitoring, repairs and insurance obligations |
|
Regulatory and transaction costs |
Open-access approvals, metering, legal documentation and compliance |
A universal ₹/MW cost or ₹/unit tariff would be misleading without specifying the state, project structure, capacity, and commercial assumptions.
Illustrative group captive solar cost calculation
Consider a manufacturing business that consumes 30 lakh units of electricity annually and is evaluating a group captive solar supply arrangement.
Illustrative annual savings calculator
Change the assumptions to understand the basic energy-cost difference. Figures are hypothetical, not market quotations.
Annual solar units
12.0 lakh
Displaced grid tariff (₹/unit)
8.50
Landed solar cost (₹/unit)
5.50
Illustrative annual energy-cost difference
₹36 lakh
₹8.50 − ₹5.50 = ₹3.00 per unit
Reset exampleThis is a simplified operating-cost comparison. It excludes equity financing, taxes, contract escalation, changes in charges, and other project-specific adjustments. It is not a payback or ROI calculation.
In the base illustration, 12 lakh units of solar electricity replace grid electricity costing ₹8.50 per unit, while the assumed all-in landed solar cost is ₹5.50 per unit.
The resulting energy-cost difference is ₹36 lakh annually, before accounting for the additional factors described above.
The example demonstrates the calculation method, not a guaranteed saving. Businesses should compare their actual avoidable electricity cost with a detailed landed-cost estimate.
Group Captive Solar vs Third-Party Open Access vs Rooftop Solar
Choosing the right solar procurement model depends on energy demand, capital availability, property constraints, and the company's preferred level of ownership.
|
Factor |
Group captive solar |
Third-party open access |
Rooftop solar |
|
Plant ownership |
Shared captive ownership |
Generally developer-owned |
Business-owned or developer-owned |
|
Equity contribution |
Required |
Usually not required |
Depends on CAPEX or OPEX model |
|
Location |
Commonly off-site |
Commonly off-site |
On-site |
|
Captive compliance |
Applicable |
Not applicable as captive procurement |
Depends on ownership and structure |
|
CSS and AS |
Captive exemptions may apply |
Generally subject to applicable charges |
Depends on applicable rules |
|
Roof space |
Not required |
Not required |
Required |
|
Best suited for |
Businesses seeking long-term captive procurement |
Businesses preferring low-equity procurement |
Businesses with suitable rooftop area |
For some industrial consumers, combining rooftop solar with group captive procurement may be more effective than selecting only one model.
The right combination should be based on hourly electricity consumption, available infrastructure, regulatory feasibility, and project economics.
Challenges and Risks Businesses Should Consider
Group captive solar can offer attractive economics, but the investment requires careful risk assessment.
Regulatory and compliance risk
Failure to satisfy captive ownership or consumption requirements can create financial liabilities, including applicable cross-subsidy surcharge, additional surcharge, and carrying costs.
Changes in open-access charges
The financial model may be affected by changes in network charges, banking rules, electricity losses, and state regulations.
Generation and consumption mismatch
Solar electricity generation varies throughout the day and across seasons. A business operating mainly at night may not be able to utilise its contracted solar electricity as effectively as a daytime manufacturing facility.
Long-term contractual commitments
Shareholding agreements, power purchase arrangements, exit provisions, payment security, and changes in electricity demand should be examined before committing capital.
Project performance risk
Poor site selection, delayed grid connectivity, equipment failures, or inadequate maintenance can reduce energy delivery and expected financial returns.
How to Evaluate and Set Up a Group Captive Solar Project
A structured feasibility assessment helps prevent costly mistakes.
- Analyse electricity consumption: Review at least 12 months of electricity bills and, where available, interval-metering data. Identify annual demand, peak consumption, load factor, and seasonal changes.
- Assess open-access eligibility: Check the relevant state electricity regulations, connection requirements, contract demand, metering arrangements, and applicable charges.
- Estimate solar energy requirements: Match expected generation and delivered electricity with the business's consumption profile.
- Review the ownership structure: Confirm equity requirements, corporate relationships, consumption allocation, and captive compliance obligations.
- Evaluate financial returns: Compare projected landed solar costs with avoidable grid electricity expenditure. Include financing costs, taxes, escalation, and sensitivity analysis.
- Select project partners: Assess developer experience, EPC capability, equipment specifications, O&M arrangements, and contractual responsibilities.
- Establish ongoing compliance monitoring: Maintain accurate generation, consumption, shareholding, and energy-settlement records.
A sound feasibility study should test both a base case and adverse scenarios, including lower generation, increased network charges, and reduced factory electricity demand.
How Rayzon Green Supports Industrial Solar Projects
A successful group captive solar project requires dependable engineering and long-term operational performance, alongside sound commercial and regulatory structuring.
Rayzon Green Private Limited provides solar EPC services for industrial and commercial applications, including project consultation, design and engineering, procurement, installation, commissioning, and maintenance.
For businesses evaluating a group captive solar project, relevant EPC support can include technical feasibility assessment, solar plant design, equipment selection, construction planning, project execution, and ongoing performance monitoring.
The objective is to develop a technically reliable solar asset that supports predictable generation and long-term project value.
Commercial ownership arrangements, captive eligibility, and open-access approvals should also be reviewed with appropriately qualified legal, regulatory, and project development advisers.
Explore Rayzon Green's solar EPC solutions or contact the team to discuss your industrial solar requirements.
Conclusion: Is Group Captive Solar Right for Your Business?
Group captive solar in India can be a practical electricity procurement option for industrial and commercial consumers seeking to optimise energy costs, access renewable power, and participate in long-term solar generation assets.
Its commercial value depends on more than an attractive electricity tariff. The 26% ownership requirement, 51% annual captive consumption requirement, regulatory compliance, open-access charges, and project performance all influence the final outcome.
Before investing, businesses should undertake a detailed technical, financial, and regulatory feasibility assessment.
For industrial solar EPC planning, project design, and execution support, connect with Rayzon Green to explore an appropriate solar solution for your operations.
Frequently Asked Questions
1. What is the 26% and 51% rule in group captive solar?
Under India's captive generation rules, captive users must collectively hold at least 26% ownership of the qualifying generating plant and consume at least 51% of its aggregate electricity generation during the financial year. Additional rules govern individual consumption entitlement and verification.
2. Who is eligible for group captive solar in India?
Industrial and commercial electricity consumers can participate if they satisfy the applicable ownership, consumption, open-access, and regulatory requirements. Eligibility depends on the specific project structure and electricity connection.
3. How much investment is required for group captive solar?
There is no single fixed investment amount. The consumer's equity contribution depends on the project valuation, ownership structure, capacity, and participation agreement. Businesses should request a detailed equity and electricity-cost breakdown.
4. Is group captive solar cheaper than grid electricity?
It can be cheaper when the landed solar electricity cost is below the avoidable grid electricity tariff. Actual savings depend on energy consumption, contracted tariff, network charges, regulatory compliance, and financing arrangements.
5. What is the difference between group captive and open-access solar?
Group captive solar is a particular ownership and consumption arrangement. Open access is the mechanism that allows eligible consumers to procure electricity using the electricity network. Third-party open-access procurement generally does not require the consumer to own part of the generating plant.
6. Is group captive solar exempt from cross-subsidy surcharge?
Qualifying captive electricity consumption benefits from the applicable cross-subsidy surcharge exemption. The Electricity (Amendment) Rules, 2026 also address additional surcharge treatment and pending verification. Exemptions depend on compliance with prescribed requirements.
7. Can small and medium enterprises participate in group captive solar?
Yes, eligible SMEs can participate. However, commercial feasibility depends on electricity consumption, minimum participation requirements, equity affordability, open-access eligibility, and project economics.
8. What happens if a group captive project fails the 51% consumption requirement?
Failure to satisfy the required captive consumption threshold can result in loss of qualifying captive treatment and liability for applicable surcharges and carrying costs. The precise consequences depend on verification findings and governing regulations.
