Captive and group captive solar projects are becoming attractive electricity cost-saving options for Indian manufacturers, particularly steel, textile, cement, chemical and automotive companies. Both models allow eligible industrial consumers to generate or procure renewable electricity while potentially avoiding cross-subsidy surcharge (CSS) and additional surcharge (AS).
However, captive and group captive solar differ in capital requirements, ownership, financial returns and regulatory obligations.
For businesses evaluating solar investments in 2026, the key question is whether owning an entire solar project delivers better returns than participating in a developer-managed group captive project.
The answer depends on electricity consumption, project cost, equity investment, state-specific open access charges and compliance with India’s updated captive electricity rules.
Captive vs Group Captive Solar: Key Differences
| Factor | Captive solar | Group captive solar |
| Ownership | Individual qualifying consumer | Multiple qualifying consumers |
| Investment | Higher individual capital commitment | Equity investment shared |
| Project size | Based on individual requirements | Often larger shared projects |
| Operations | Self-managed or outsourced | Commonly developer-managed |
| Electricity procurement | Own generating facility | Shared project under agreed allocation |
| Main benefit | Asset control and long-term savings | Lower individual capital requirement |
| Major risk | Capital and generation performance | Compliance, developer and exit risks |
A large steel manufacturer with substantial electricity demand may prefer a dedicated captive solar plant. Smaller steel producers operating in the same industrial cluster may benefit from a shared group captive project.
Both structures can qualify for captive benefits, provided statutory ownership and electricity consumption conditions are satisfied.
India’s Captive Solar Rules 2026: Ownership and Consumption Requirements
The Electricity (Amendment) Rules, 2026, notified in March, clarified captive generating plant ownership, electricity consumption and verification requirements.
Under the general captive framework:
Captive users must collectively hold at least 26 percent ownership of the generating plant.
Captive users must collectively consume at least 51 percent of aggregate annual electricity generation for captive use.
Association-of-persons structures are subject to applicable proportionate-consumption requirements.
Changes in ownership and consumption can affect captive eligibility.
The amended framework also addresses ownership changes during the financial year and verification of captive status.
A user holding at least 26 percent ownership is exempt from the specified proportionate-consumption limit under the amended provisions, although other captive requirements continue to apply.
If a project fails captive qualification, applicable CSS and AS may become payable, potentially with carrying costs.
The Ministry of Power’s Electricity (Amendment) Rules, 2026 provide the legal framework businesses should examine before investing.
Captive vs Group Captive Solar Investment Cost in 2026
Project investment depends on capacity, location, solar equipment, land, grid infrastructure and financing.
Consider an illustrative utility-scale solar investment cost of ₹3.5 crore per MW.
| Project capacity | Total investment | Equity at 30% | Debt at 70% |
| 1 MW | ₹3.5 crore | ₹1.05 crore | ₹2.45 crore |
| 5 MW | ₹17.5 crore | ₹5.25 crore | ₹12.25 crore |
| 10 MW | ₹35 crore | ₹10.5 crore | ₹24.5 crore |
| 50 MW | ₹175 crore | ₹52.5 crore | ₹122.5 crore |
These are financial modelling assumptions, not verified nationwide market prices.
Under captive ownership, an individual company may need to arrange the entire project equity contribution.
Under group captive procurement, participating consumers share qualifying ownership and associated equity obligations, while developers and financing partners may provide the remaining investment.
For example, a 50 MW group captive solar project costing ₹175 crore could require qualifying captive users collectively to hold at least ₹45.5 crore of ownership value if ownership is measured proportionately to this assumed project equity valuation. Actual contributions depend on the project’s ownership structure and applicable rules.
This makes group captive solar worth evaluating for businesses that cannot independently finance large renewable projects.
How Much Can Captive and Group Captive Solar Save?
The financial advantage of qualifying captive generation comes partly from exemptions from CSS and AS, where applicable.
However, businesses may still pay transmission, wheeling, banking, scheduling and other applicable charges.
The correct comparison is between the avoidable grid electricity cost and the fully landed cost of usable solar electricity.
Consider a manufacturer paying ₹8.50 per unit for avoidable grid electricity.
If the effective solar electricity cost is ₹5.50 per unit, the saving is ₹3 per usable unit.
| Annual solar consumption | Savings at ₹3/unit |
| 10 lakh units | ₹30 lakh |
| 25 lakh units | ₹75 lakh |
| 50 lakh units | ₹1.50 crore |
| 1 crore units | ₹3 crore |
| 1.5 crore units | ₹4.50 crore |
These figures represent illustrative electricity cost differences, not guaranteed net profits. The landed solar cost must include all applicable costs without double-counting project capital or operating expenses.
10 MW Captive Solar Project: Cost and Savings Example
Consider a 10 MW solar project requiring ₹35 crore in capital investment.
Assume annual generation of 1.6 crore units, with participating factories using 90 percent of production.
Usable electricity would reach 1.44 crore units annually.
At an avoidable grid cost of ₹8.50 per unit and an assumed fully landed solar cost of ₹5.50, the project delivers a cost advantage of ₹3 per unit.
Illustrative annual electricity savings: ₹4.32 crore.
However, this amount cannot automatically be treated as the cash return on ₹35 crore invested.
If the ₹5.50 solar cost includes capital recovery, financing or maintenance, those expenses must not be deducted again or ignored when calculating investment payback.
Captive investors should separately model annual operating cash flows, debt servicing, taxes, depreciation and residual asset value.
Group Captive Solar Case Study: Raipur Steel Industry
A 2026 study by JMK Research & Analytics, WWF-India, Climate Catalyst and CII-Green Business Centre examined renewable electricity procurement for India’s secondary steel industry.
The JMK Research study on secondary steel renewable electricity procurement evaluated group captive solar economics across industrial clusters.
For a representative steel producer in Raipur, the study modelled a 10–12 MW allocation from a larger 50–70 MW AC solar project.
Key findings included:
Estimated equity investment: ₹2.7 crore
Estimated annual electricity savings: ₹2.4 crore
Landed electricity cost: approximately 34 percent below grid tariffs
Modelled equity payback: one to two years
These figures suggest that group captive procurement can offer attractive equity returns when the developer finances and manages much of the generating asset.
However, the estimates represent modelled outcomes rather than independently verified operating returns.
Group Captive Solar Case Study: Rajkot Foundries
The same study examined renewable electricity procurement for a representative foundry in Rajkot, Gujarat.
For a 5 MW group captive allocation, the analysis estimated:
| Financial indicator | Modelled outcome |
| Solar allocation | 5 MW |
| Equity investment | ₹1.4 crore |
| Annual electricity savings | ₹2.2 crore |
| Electricity cost reduction | Approximately 20% |
The results indicate that group captive solar could offer meaningful savings for smaller industrial consumers.
However, annual electricity savings and equity investment are different financial measures. The ₹2.2 crore saving should not automatically be interpreted as distributable cash flow or an investment return.
Financing costs, contractual obligations, electricity delivery and captive compliance determine the actual benefit.
Which Industries Should Choose Group Captive Solar?
Group captive projects can be particularly relevant to industrial clusters where multiple companies have substantial electricity demand but limited individual investment capacity.
Steel and foundries: High electricity consumption can support large renewable procurement allocations.
Textiles: Spinning mills and processing units may benefit from long-term electricity cost stability.
Automotive suppliers: Manufacturers can combine rooftop generation with group captive procurement.
Chemicals and pharmaceuticals: Continuous industrial operations create opportunities for substantial renewable electricity purchases.
Food processing: Businesses with predictable daytime loads may benefit, although seasonal demand must be considered.
For example, five manufacturing companies could participate in a common solar project rather than independently developing five smaller plants. Shared development and operations may create economies of scale, although savings depend on the contractual structure.
Major Risks in Group Captive Solar Projects
Group captive projects introduce risks beyond solar generation performance.
Ownership compliance: Participant exits or ownership changes can affect captive eligibility.
Electricity consumption: Individual allocations must comply with applicable consumption requirements.
Developer performance: Delays, poor maintenance or financial difficulties can reduce electricity delivery.
Regulatory changes: State-level charges, banking rules and network regulations may change project economics.
Exit restrictions: Long-term contracts and shareholding agreements can limit flexibility.
Before signing, companies should review ownership arrangements, electricity allocation, exit rights, developer guarantees, payment obligations and liability for failed captive verification.
Final Verdict: Captive or Group Captive Solar?
Captive solar can be attractive for large manufacturers with predictable electricity demand, sufficient investment capital and a preference for controlling their generation assets.
Group captive solar may be better suited to medium-sized manufacturers seeking lower individual equity commitments and developer-managed renewable procurement.
The Raipur and Rajkot case studies illustrate the potential for substantial electricity savings and relatively short modelled equity payback periods under favourable conditions.
However, the best investment is not necessarily the project with the lowest solar tariff or smallest initial equity requirement.
Businesses should compare landed electricity costs, equity cash flows, financing expenses, generation forecasts and compliance risks over the entire project life.
In 2026, the most important requirement is to maintain captive eligibility while delivering reliable electricity savings. A project that fails ownership or consumption verification may lose surcharge benefits and materially weaken its financial returns.
SHAFANA FAZAL