NEW DELHI, July 20 — Power purchase agreements are quietly reshaping how corporate India buys electricity, but the model is far from new. A PPA is simply a long-term contract — lasting anywhere from 5 to 20 years — between an electricity generator and a buyer, typically a utility, a government, or a company. The buyer agrees to purchase energy at a pre-negotiated price over the life of the deal.
For independently owned renewable energy producers — solar farms, wind farms — these contracts are the financial bedrock that makes construction possible. In 2021, more than 137 firms across 32 countries reported signing such agreements.
That figure has only grown since, especially as tech giants look to power their sprawling data centers with renewable energy. By committing to long-term purchases, these buyers enable the financing of new solar and wind projects. For a company building a server farm, a PPA locks in electricity costs for a decade or more — a hedge against volatile grid prices.
How the deal is structured
The structure can vary. A PPA may specify a fixed amount of electricity to be delivered, or a fixed portion of the generator’s total output. Pricing might be flat per kilowatt-hour, or it could fluctuate with market rates.
The point of delivery also matters: in a ‘busbar’ sale, the buyer takes ownership at the generator’s connection point and shoulders transmission costs from there. Alternatively, the seller may agree to deliver to a different point on the grid, with complex arrangements to split the price difference.
In the distributed generation model — where panels sit on a building’s roof — commercial PPAs have evolved to let businesses, schools, and governments buy directly from the generator on site. That approach helps finance assets such as photovoltaic panels, micro-turbines, reciprocating engines, and fuel cells. Australia offers a clear example: onsite PPAs there typically involve a solar EPC company designing and installing rooftop solar panels on commercial premises, then managing and maintaining the system, selling power back to the business for the contract’s lifetime.
Performance guarantees and pricing
These contracts are not simple. A PPA often specifies the expected annual energy output. If the generator produces more than that, the sales rate can be negatively adjusted — an incentive to forecast accurately.
The buyer also typically demands performance guarantees: if output falls short, the seller must compensate. Other guarantees include availability and power-curve guarantees, especially for wind farms where output varies with the wind.
Pricing can be flat, escalate over time, or be negotiated freely — subject to regulation by an Electricity Regulator where one exists. In India, where state electricity regulators set tariff frameworks, PPAs must often fit within those rules. Yet the flexibility of the instrument allows companies to tailor terms to specific projects.
What to watch next
For Asian markets, the key question is whether the regulatory environment will keep pace with corporate demand. As more companies set renewable energy targets, PPAs offer a direct route to procuring clean power without owning the generation assets. The model that helped finance Australia’s commercial rooftop solar boom is now being adapted for office towers and factory roofs.
If the financing structure holds, expect more PPAs — and more renewable capacity — in the years ahead.
