Group Captive

What Is Group Captive?

The captive consumer(s) must hold at least 26% of the equity capital of the generating company.

The captive consumer(s) must consume at least 51% of the electricity generated by the plant on an annual basis.

Consumption is measured over the financial year. For a company, ownership means equity share capital with voting rights. When both thresholds are met, the plant qualifies as a captive generating plant. The consumer benefits from regulatory treatment specific to captive plants, most importantly exemption from cross-subsidy surcharge, which Section 42(2) of the Electricity Act 2003 says is not leviable when open access is used to carry captive power to the owner’s own use.

For a step-by-step walkthrough of setting up this structure, see our detailed group captive solar setup guide.

For C&I consumers in states with high CSS, the saving from group captive over standard open access is roughly the CSS that would otherwise apply on the contracted volume. Against typical grid C&I tariffs, group captive can deliver compelling economics.

Heaven Green Energy insight: We have structured group captive arrangements for textile, pharmaceutical, and chemical clusters across Gujarat, Maharashtra, and Rajasthan. The CSS exemption alone typically improves project IRR by 2 to 3 percentage points for high-consumption industrial clients.

Why Group Captive Matters

Group captive is one of the most powerful financial structures available to large electricity consumers in India.

1. CSS exemption is transformational: Cross-subsidy surcharge is set state by state and is a large part of the cost of open-access solar in high-CSS states. Removing it can cut the landed cost of solar substantially.

2. Long-term price certainty: Group captive PPAs typically run 15 to 25 years at fixed or lightly escalating tariffs, insulating consumers from volatile grid tariff increases.

3. No balance sheet burden: The SPV structure allows consumers to benefit from captive treatment without consolidating the power plant on their balance sheets.

4. Scalability: Multiple consumers can pool demand to achieve economies of scale on large ground-mount projects that individual consumers could not justify alone.

5. Regulatory stability: The captive definition sits in central rules (Electricity Rules 2005) and the CSS exemption in the Electricity Act 2003, giving more stability than state-specific incentive schemes.

How Group Captive Works

The group captive structure follows a precise legal and financial sequence.

Step 1, Developer identification: A solar developer identifies suitable land with grid evacuation infrastructure for a utility-scale solar plant, typically 10 to 100 MW. Because these plants are almost always ground-mounted, developers typically commission professional ground-mount PV layout and design services to optimize land use and array orientation before finalising the site.

Step 2, Consumer consortium formation: C&I consumers interested in captive solar come together as a captive group. Each consumer’s equity contribution must track its share of consumption: in an association of persons, each captive user consumes in proportion to its ownership share, within a 10% variation.

Step 3, Equity structuring: The captive users invest equity to acquire, in aggregate, at least 26% of the generating company’s equity share capital with voting rights. The developer retains the remaining 74% and operational control. A shareholders agreement governs rights, obligations, and exit provisions.

Step 4, PPA execution: The generating company signs long-term power purchase agreements with each captive consumer. Tariffs are typically Rs 3.00 to Rs 4.00 per kWh before open-access charges.

Step 5, Plant construction: The developer constructs the solar plant using EPC contractors. ALMM-listed modules, BIS-certified inverters, and IEC-certified components are standard requirements.

Step 6, Commissioning and operation: Upon commissioning, power flows from the plant through the transmission network to each consumer’s delivery point. Consumers pay the PPA tariff plus applicable wheeling, transmission, and banking charges.

Step 7, Annual compliance verification: Each financial year, the captive users must show that they held at least 26% ownership and consumed at least 51% of generation. Under Rule 3(2), if the minimum captive consumption is missed in any year, the entire electricity generated is treated as a supply by a generating company, so captive benefits such as the CSS exemption are lost for that year. State regulatory filings document compliance.

Visual Explanation

Real-World Example

The following is an illustrative scenario, not a specific client project.

An industrial park in Vapi, Gujarat’s chemical cluster housed 12 manufacturing units with combined electricity demand of 45 MWh per day. Grid C&I tariffs from the local DISCOM, DGVCL, averaged Rs 9.50 per kWh with annual escalation of 3% to 5%.

Before shortlisting the 25 MW site, the park’s association commissioned a formal site survey and land feasibility assessment to confirm evacuation capacity, soil bearing strength, and shading constraints for the proposed ground-mount plant.

The park’s association evaluated three procurement options:

The association chose Option C. Five large consumers together took 30% of the equity in the generating company (exceeding the 26% minimum). The combined consumption of the five members exceeded 55% of plant output, satisfying the 51% threshold.

Modelled results:

• Average landed cost: Rs 4.80 per kWh (PPA Rs 3.50 + wheeling Rs 1.00 + transmission Rs 0.30)
• Savings versus open access: Rs 1.70 per kWh
• Annual savings: Rs 7.8 crore across the five member units
• Payback on equity investment: 4.2 years

In a structure like this, other park members could join later, provided the group’s ownership and consumption still meet the thresholds.

Technical Specifications / Benchmarks

Benefits / Advantages

• CSS exemption: The primary benefit. Saves the cross-subsidy surcharge that standard open access pays, which matters most in high-CSS states.
• Lower effective tariff: Final landed cost of Rs 4.00 to Rs 5.50 per kWh versus grid tariffs of Rs 8.00 to Rs 12.00 per kWh.
• Long-term price certainty: Fixed or lightly escalating tariffs for 20 to 25 years protect against volatile grid tariff increases.
• No upfront capital requirement: The 26% equity contribution is modest relative to total project cost and is recoverable through tariff savings.
• Scalability through pooling: Multiple consumers achieve utility-scale economics that individual consumers cannot justify.
• Green energy credentials: 100% renewable procurement supports ESG reporting and carbon reduction targets.
• Tax benefits: The generating company can claim Accelerated Depreciation (40% on solar power generating systems), improving project returns. Electricity itself is exempt from GST, so GST paid on the plant is generally not recoverable as input credit.
• Regulatory stability: Central rules (Electricity Rules 2005) and the Electricity Act provide more certainty than state-specific schemes.

Limitations / Drawbacks

• Equity requirement: Consumers must invest capital and hold equity throughout the PPA term. Corporate actions affecting shareholding can jeopardise captive status.
• Consumption commitment: The 51% annual consumption threshold must be maintained. Business downturns or facility closures can breach compliance.
• Structuring complexity: SPV formation, shareholders agreements, and regulatory filings require specialised legal and tax expertise.
• State-level variation: Implementation rules vary across states. Some states have restrictive interpretations of equity and consumption thresholds.
• Developer dependence: The consumer relies on the developer for construction quality, O&M, and regulatory compliance.
• Limited to C&I: Residential consumers cannot practically participate due to consumption scale and equity requirements.
• Exit constraints: Selling equity or leaving the captive group requires careful structuring to maintain the 26% and 51% thresholds.
• Not suitable for low-CSS states: In Gujarat and Rajasthan where CSS is modest, standard open access may be simpler with similar economics.

Comparison

Applications

Large industrial consumers: Steel, cement, textile, and chemical plants with 10+ MWh daily consumption use group captive to offset high grid tariffs. A single 50 MW captive plant can serve multiple facilities within a 50 km radius. These loads sit squarely in the C&I solution category, where inverter sizing and evacuation design differ significantly from residential or small commercial systems.

Industrial parks and clusters: Multiple units within an industrial park pool demand to form a captive group. The shared infrastructure reduces per-unit transaction costs.

IT campuses and data centres: Technology parks with consistent 24/7 load profiles benefit from long-term price certainty and green energy credentials.

Multi-location corporates: Pan-India companies set up group captive plants in multiple states, each serving regional facility clusters.

Educational and institutional campuses: Universities, hospitals, and research campuses with large contiguous loads form captive groups for dedicated solar parks.

Industry Standards & Regulations

Group captive is governed by a layered regulatory framework:

• Electricity Act 2003: Defines captive generating plant and establishes regulatory authority
• Electricity Rules 2005: Rule 3 specifies the 26% ownership and 51% consumption thresholds
• State SERC orders: Implement captive rules at state level, including CSS treatment
• CERC regulations: Govern inter-state connectivity, access and transmission pricing
• Forum of Regulators: Issues model frameworks for captive implementation
• Corporate law: SPV formation, shareholders agreements, and governance under Companies Act 2013
• Income Tax Act: Tax treatment of equity returns, dividend distribution, and depreciation

Key regulatory considerations:

• For a company, the 26% threshold is measured as equity share capital with voting rights (Rule 3, Explanation); check later amendments to the Rules for how group-company holdings are treated
• The 51% consumption threshold is verified each financial year based on metered data
• The CSS exemption is statutory, but state SERCs set the verification procedure and can levy CSS if captive status is not proved
• Inter-state captive arrangements need inter-state connectivity and access under CERC regulations, administered by the CTU and grid operators

India-Specific Context

Group captive adoption varies significantly across Indian states based on CSS levels and regulatory environment.

High-CSS states (active group captive markets):

• Maharashtra: CSS is high for many C&I categories, so group captive is widely used by large consumers.
• Karnataka: Active captive market with well-established implementation rules.
• Tamil Nadu: High CSS drives strong captive adoption among manufacturing units.
• Andhra Pradesh and Telangana: Growing captive markets with supportive regulatory frameworks.
• Uttar Pradesh: Increasing captive activity as industrial load grows.

Moderate-CSS states (nuanced choice):

• Gujarat: CSS is relatively lower, making the open access vs group captive decision more project-specific. Heaven Green Energy’s commercial solar team advises clients on state-specific modelling.
• Rajasthan: Similar to Gujarat. Open access may suffice for smaller consumers.

Restrictive states:

• Some states have at times added conditions on open access or captive verification that affect both open access and captive models. Check the current SERC regulations before structuring.

PLI scheme interaction: Domestic module supply under PLI supports captive projects with ALMM-compliant, cost-competitive modules. Developers increasingly source from Indian manufacturers to meet project requirements.

Future Trends

Regulatory evolution: The Forum of Regulators continues refining model frameworks for captive implementation. Expect greater standardisation of equity and consumption verification processes across states.

Corporate renewable demand growth: Corporate RE100 commitments and ESG reporting requirements are pushing up corporate renewable procurement. Group captive is likely to capture a significant share of this demand.

Hybrid captive models: Group captive structures are expanding beyond solar to include wind-solar hybrid, solar-plus-storage, and round-the-clock (RTC) arrangements. The 26%/51% rules apply to the combined generation.

Green hydrogen linkage: Large electrolyser projects for green hydrogen production will use group captive structures to secure low-cost renewable power, potentially creating the largest captive consumers in Indian history.

Digital compliance: Digital generation tracking and automated compliance reporting could reduce the administrative burden of maintaining captive status.

Consolidation: The RESCO and captive markets are consolidating around large players with strong balance sheets and regulatory expertise. Smaller developers face increasing competitive pressure.

Common Mistakes & Misconceptions

1. Treating the 26% and 51% rules as automatically met without proper documentation. Annual verification requires maintained records and regulatory filings.

2. Underestimating SPV structuring complexity. Tax, regulatory, and corporate law all interact. Engage specialists early.

3. Forgetting that consumption must be actual, not just contracted. The 51% threshold applies to metered consumption, not contracted capacity.

4. Failing to track equity proportions through corporate actions. Mergers, demergers, or share transfers can disturb the 26% threshold without careful planning.

5. Skipping due diligence on the developer. A group captive PPA failure is more complex to unwind than standard open access. Verify track record and financial strength.

6. Not addressing consumption profile changes. If a consumer’s business changes and consumption falls below their pro-rata share, the 51% threshold may be at risk.

7. Assuming CSS exemption is automatic. The exemption is statutory, but it holds only while captive status is proved each year, and state SERC verification procedures can change. Monitor regulatory developments.

8. Ignoring inter-state complications. Multi-state captive groups face inter-state access requirements and transmission pricing complexity.

9. Neglecting exit provisions. The shareholders agreement must address how members can exit without jeopardising captive status.

10. Choosing group captive in low-CSS states without comparison. In Gujarat and Rajasthan, standard open access may deliver similar economics with lower complexity.

Key Takeaways

• Group captive requires 26% equity and 51% consumption by the consumer group to qualify for captive regulatory treatment.
• CSS exemption is the primary benefit, removing the cross-subsidy surcharge that standard open access pays.
• The structure suits large C&I consumers in high-CSS states (Maharashtra, Karnataka, Tamil Nadu, Uttar Pradesh).
• SPV-based equity holding allows multiple consumers to pool demand and meet thresholds collectively.
• Final landed cost is Rs 4.00 to Rs 5.50 per kWh, versus grid tariffs of Rs 8.00 to Rs 12.00 per kWh.
• Annual compliance verification of ownership and consumption thresholds is mandatory; missing 51% in a year makes all that year’s generation a normal supply.
• Structuring requires specialised expertise in regulatory, corporate, and tax law.
• Group captive is one of the most cost-effective ways to source renewable energy at scale in India.

Related Glossary Terms

Related Resources

• OPEX vs CAPEX Solar
• PM KUSUM Complete Guide
• Net Metering in India
• Accelerated Depreciation Solar
• How to Choose a Solar Contractor
• Commercial Solar
• Industrial Solar
• Ground Mount Solar Park
• Solar Calculator

Sources & References

• Electricity Act 2003, Government of India
• Electricity Rules 2005, Definition of Captive Generating Plant
• Central Electricity Regulatory Commission (CERC), Orders on Inter-State Open Access and Captive Generation
• State Electricity Regulatory Commissions (SERCs), Maharashtra, Karnataka, Tamil Nadu, Gujarat, Rajasthan
• Forum of Regulators, Model Framework for Captive Generation Implementation
• Ministry of Power, Guidelines for Open Access
• MNRE, Scheme Guidelines for Grid-Connected Solar
• Mercom India Research, C&I Solar Market Report 2025
• Bridge to India, India Solar Compass Q1 2026