Captive Power Plants

A captive power plant is a power station that a company or a group of users sets up mainly to meet its own electricity needs. For example, a large aluminium or steel factory may build its own coal power plant next to the factory. The electricity is "captive" because it is produced mostly for the owner's own use, not for sale to the public.

Why do industries build them?

Heavy industries like aluminium, steel, cement and refining need huge amounts of electricity, all day, without breaks. A power cut of even a few minutes can damage machines or spoil a batch of molten metal. Grid power is also often costly for industry, because industrial tariffs include a cross-subsidy that helps keep prices low for farmers and households.

So many factories find it cheaper and more reliable to make their own power. It is like a big hotel running its own generator and water tank rather than depending fully on the city supply.

What does the law say?

• Section 2(8) of the Electricity Act, 2003 defines a captive generating plant as a plant set up by any person to generate electricity primarily for his own use. It includes plants set up by a cooperative society or an association of persons for their members' use.
• Section 9 says any person may build, maintain or operate a captive plant and dedicated transmission lines. No licence is needed.
• Power from a captive plant that goes through the grid is regulated like any other generating station.
• Captive owners have a legal right to open access, meaning they can use the grid to carry power from their plant to their factory.

The two tests to qualify as captive (Rule 3, Electricity Rules, 2005)

1. Ownership test: The captive users together must own at least 26% of the plant.
2. Consumption test: The captive users must use at least 51% of the electricity the plant produces in a year.

Both tests are checked every financial year. If a plant fails either test in a year, it loses captive status for that year.

Group captive

Sometimes many small users jointly own one plant, often a solar or wind park. This is called group captive. Each user must consume power in proportion to its share of ownership. The Electricity (Amendment) Rules, 2026 (March 2026) revised Rule 3. Ownership can now be counted through a company's subsidiaries and holding company, which are treated together as one captive user.

The rules also clarified how the 51% consumption is shared among members and who verifies captive status (state agencies for plants within a state; the national grid operator for inter-state cases).

Why does captive status matter? Money

A consumer who buys from a supplier other than the discom through open access normally pays extra charges:

• a cross-subsidy surcharge, to make up for the subsidy the discom loses, and
• an additional surcharge under Section 42(4), to cover the discom's stranded costs.

Captive users are exempt from the cross-subsidy surcharge. In Maharashtra State Electricity Distribution Co. Ltd. v. JSW Steel Ltd. (10 December 2021), the Supreme Court held that captive users are a separate class from ordinary consumers and are not liable to pay the additional surcharge under Section 42(4) either. This is why companies are keen to keep captive status.

India's captive power in numbers

India's captive plants had a total installed capacity of roughly 81 GW in 2023-24. About 46 GW of this was coal-based, and the rest was diesel, gas and renewables. Many coal-based captive plants run well below full capacity. The biggest users are in states rich in coal and minerals, such as Odisha, Chhattisgarh and Jharkhand, where aluminium and steel plants are located.

Commonly confused concepts

• Captive power plant vs Independent Power Producer (IPP): A captive plant makes power mainly for its owner. An IPP is a private company that makes power to sell to discoms or others.
• Captive power plant vs captive coal mine: A captive coal mine is a mine given to a company to dig coal for its own end use, such as its power or steel plant. It is about fuel, not electricity.
• Captive vs rooftop solar (net metering): A household rooftop solar system is small and connected to the discom through net metering. Captive plants are industrial-scale and governed by the ownership and consumption tests.
• Captive vs open access: Open access is a right to use the grid to buy power from someone other than the discom. Captive generation is one way of producing power. Captive users often use open access to move their own power.

Issues, criticism and the way forward

• Loss for discoms: When large industries leave the grid for captive power, discoms lose their best-paying customers. This makes it harder to fund subsidies for farmers and households.
• Pollution and emissions: Many captive plants are old, small and coal-based, and often less efficient than big utility plants. Moving captive power to renewable energy through group captive models is seen as the way forward.
• Misuse of captive status: Some arrangements are designed only to avoid surcharges. Regulators check ownership and consumption closely for this reason, which also creates disputes.
• Idle capacity: Much captive coal capacity runs below full load. Letting it sell surplus power on exchanges can add supply at times of shortage.

Concepts to Know

• Installed capacity: The maximum power a plant can produce, measured in megawatts (MW) or gigawatts (1 GW = 1,000 MW).
• Open access: The right of a large consumer or generator to use the transmission and distribution wires to buy or sell power with someone other than the local discom, by paying charges.
• Surcharge: An extra charge added on top of the normal price.
• Plant load factor (PLF): How much electricity a plant actually produced compared with the maximum it could have produced. A PLF of 50% means the plant ran at half its potential on average.