What Is a Corporate Power Purchase Agreement (PPA)?

A corporate power purchase agreement, or corporate PPA, is a long-term contract between a business and a renewable energy generator. The business commits to buying a set volume of electricity at an agreed price, typically for ten to fifteen years. The generator gets the revenue certainty it needs to finance a new project. Both parties get something they could not easily achieve in the spot market.

It is not a product for every organisation. The commitments are substantial. But for large energy users trying to secure price certainty, build credible green credentials, or support genuinely new renewable capacity in the UK, a corporate PPA is worth looking at closely.

Physical vs Virtual: The Two Main Structures

There are two fundamentally different types, and the distinction matters.

A physical PPA involves electricity actually being delivered to your site, either directly from the generator in an on-site arrangement or routed through the grid via a licenced supplier in what is called a sleeved PPA. You pay the generator for the power, and in most structures you also receive the Renewable Energy Guarantees of Origin (REGOs) that certify its source.

A virtual or synthetic PPA works differently. No power changes hands. Instead, you and the generator agree a fixed strike price, and you settle the financial difference against the market: if spot prices exceed the strike, the generator pays you back; if they fall short, you make up the difference. You continue buying electricity through your normal supplier as before.

Virtual PPAs are more common for businesses with multiple dispersed sites, or where direct physical delivery is not practical. Physical arrangements tend to be cleaner for carbon reporting, since REGO ownership and market-based scope 2 accounting are more straightforward to document.

Who Corporate PPAs Suit

Size is the primary constraint. Most PPA structures work best for businesses consuming five gigawatt hours (GWh) or more of electricity per year. Below that threshold, the contractual overhead, credit requirements, and basis risk involved start to outweigh the benefits.

That said, aggregated PPAs have emerged as a route to market for smaller businesses. A group of buyers can pool their consumption to meet the volume a generator needs to secure project finance, sharing the contract between them. It is more complex to arrange, but it opens the market to organisations that would otherwise fall short.

The types of business most commonly drawn to corporate PPAs are large manufacturers, data centre operators, retail chains, commercial real estate portfolios, and public sector bodies with substantial electricity consumption. For any of these, a corporate PPA sits at the more structured end of the green energy procurement options available, well above a standard green tariff in both commitment and substance.

The Main Benefits

For most signatories, price certainty is the main driver. Fixing the cost of electricity for ten or fifteen years provides protection against wholesale market volatility. In years when spot prices spike, the saving relative to short-term contract renewals can be very significant.

Green credentials come second. A corporate PPA linked to a new project that would not have been built without your commitment provides a more substantive environmental claim than purchasing a standard renewable tariff. It supports scope 2 market-based emissions reduction under the GHG Protocol, and it increasingly represents the kind of credible, auditable action that institutional investors, lenders, and large customers want to see documented.

Some businesses also value the additionality argument: that their contract is directly enabling new renewable capacity to be built, rather than simply re-attributing existing generation. For organisations working toward science-based targets or making public net zero commitments, this distinction carries genuine weight.

The Risks and What to Watch For

The long-term nature of a corporate PPA is both its main appeal and its main risk. Energy markets move. A business that locks in at a price that looks attractive in year one may find itself above market rates a few years later. And exiting early is typically expensive, with termination costs built into most contracts.

Basis risk is a specific concern in virtual structures. If the strike price references a national day-ahead index but your actual consumption pattern differs significantly from how the generator produces, you can end up with a financial mismatch between what you expected to settle and what you actually pay. Getting the structure right from the outset, with independent advice, matters a great deal.

Credit is also a practical consideration. Generators and their project financiers need confidence that the buyer will be around to honour the contract for its full term. Smaller or younger businesses may face guarantees or security requirements that add cost and complexity.

Ofgem’s guidance on business energy procurement covers the broader regulatory context for UK businesses buying electricity.

How the Procurement Process Works

Getting to a signed corporate PPA typically involves three stages, and the process is unlike standard energy procurement in several important respects.

First, an assessment of whether your business is a viable candidate: consumption volume, site structure, credit profile, and what you are actually trying to achieve. Not every business that wants a PPA will be attractive to generators, and understanding your position before going to market saves time.

Second, a structured market process to identify willing generators and negotiate terms. This is not simply a matter of comparing quotes. PPA negotiation involves bilateral commercial discussion, and the terms, particularly around indexation, curtailment, REGO provision, and termination rights, vary considerably between counterparties.

Third, legal and financial due diligence on the agreement itself. These contracts are long, complex, and the detail matters. Independent legal review is not optional.

Catalyst’s energy consulting team works with UK businesses on energy procurement strategy, including assessing whether a corporate PPA is the right fit for a given organisation’s consumption profile, risk appetite, and commercial objectives. Where it is appropriate, we can support the market engagement and negotiation process.

If you want to understand whether a corporate PPA makes sense for your business, get in touch.

Talk to Catalyst about corporate PPAs →

Related service: Power Purchase Agreements, how Catalyst helps UK businesses structure and procure corporate PPAs.

Further reading: REGO Certificates Explained, how unbundled certificates compare with a PPA when you need a renewable claim that survives scrutiny.