BEIJING, July 20 — More than 137 firms across 32 countries reported signing power purchase agreements in 2021, according to industry figures. The contracts, known as PPAs, are long-term arrangements between electricity generators and customers that typically span 5 to 20 years, during which the buyer purchases energy at pre-negotiated prices. For renewable energy producers such as solar farms and wind farms, these agreements form the financial backbone that makes independent project financing possible.
A power purchase agreement defines the relationship between a seller — usually a project owner structured as a special purpose entity — and a buyer. The buyer may be a utility, a company purchasing electricity for its customers, an electricity trader, or in the case of commercial PPAs, the building occupant such as a business, school or government.
The contract can cover a predefined amount of electricity or a predefined portion of the seller’s output, with pricing that may be fixed per kilowatt-hour, escalate over time, or fluctuate with market rates. In regulated markets, an electricity regulator sets the price. The delivery point for electricity under a PPA varies.
In a busbar sale, the transfer occurs at the generator’s grid connection point, with the buyer responsible for transmission. Other arrangements place responsibility on the seller to deliver to an agreed point, or involve more complex structures where injection and withdrawal happen at different grid points, with price differences split as specified.
Distributed Generation and Commercial PPAs
In distributed generation — where the generator is located on-site, such as rooftop solar panels on a building — commercial PPAs allow businesses, schools and governments to buy electricity directly from the generator rather than from a utility. This model facilitates financing for assets including photovoltaic systems, micro-turbines, reciprocating engines and fuel cells. In Australia, onsite PPAs typically involve rooftop solar panels on commercial premises.
A solar engineering, procurement and construction (EPC) firm designs and builds the system, manages the asset, and sells energy back to the business for the contract’s lifetime. The seller under a PPA is often a special purpose entity structured specifically to enable non-recourse project financing — meaning the project’s assets and cash flows secure the debt, not the developer’s balance sheet.
This structure is critical for capital-intensive renewable energy projects that require long-term revenue certainty.
Key Terms and Guarantees
The PPA typically stipulates an expected annual output. Excess energy may negatively affect the sales rate, incentivising accurate production estimates. Performance guarantees are common: the seller must meet output standards, and if generation falls short, the seller compensates the buyer.
Additional guarantees may include availability and power-curve guarantees, providing further assurance to the buyer that the generator will perform as forecast. Pricing terms can be flat, escalate over time, or be otherwise negotiated.
The contract also specifies the expected annual output, and any deviation — particularly surplus generation — can reduce the effective sales rate, pushing the seller to forecast accurately.
Market Context and Outlook
As of 2021, more than 137 firms across 32 countries had reported signing PPAs, underscoring the global reach of these instruments. Since then, the expansion of renewable energy capacity has only deepened reliance on such contracts, though precise global figures for subsequent years are not yet available. Looking ahead, as countries accelerate deployment of solar and wind power to meet climate targets, the PPA structure will remain a central tool for developers seeking financing.
The contract’s flexibility — in pricing, delivery point, and duration — allows it to adapt to different regulatory environments and project types. Market participants will be watching how evolving electricity market rules, particularly in regulated systems, affect the standardisation and bankability of future agreements.
