● Explainer
By Environment+Energy Leader Editorial Staff · Updated July 2026
Definition
Power Purchase Agreement (PPA)
A power purchase agreement (PPA) is a long-term contract that allows an organization to buy renewable electricity and its associated renewable energy certificates (RECs) from a specific project at a predetermined price, typically for 10 to 20 years.
In This Explainer
Executive takeaway · What a PPA is · How PPAs work · Types of PPAs · Who should consider one · Market context · Benefits · Risks · Scope 2 reporting · Evaluation checklist · FAQ · Glossary
Power Purchase Agreements: The Executive Takeaway
A power purchase agreement is not simply a clean energy purchase. It is a long-term financial, operational, and emissions-accounting commitment that can reduce Scope 2 emissions and improve energy price visibility when the contract structure, project location, REC treatment, and delivery assumptions are understood before signing.
For executives, the central risk is treating a PPA as a sustainability shortcut rather than an energy procurement decision. The strongest PPA evaluations test the contract against market price exposure, basis risk, curtailment risk, interconnection delays, developer creditworthiness, accounting treatment, and the documentation needed to support market-based Scope 2 claims.
If you've spent any time in a sustainability strategy meeting in the last five years, you've heard the acronym. PPAs come up whenever the conversation turns to renewable energy procurement, Scope 2 targets, or the gap between what a company has committed to and what it's actually done. They're often described as the gold standard for corporate clean energy — which is true, with caveats — and just as often described in ways that make them sound more complicated, or simpler, than they actually are.
This explainer is for the sustainability director who keeps nodding along in those meetings and wants to stop. It's also for the energy manager who understands the mechanics but needs to explain them clearly to a CFO who controls the budget. We'll cover what a PPA is, how the different types work, who they make sense for, and where the real risks live — because there are real risks, and most vendor materials conveniently underplay them.
A power purchase agreement is a long-term contract between a company and a renewable energy generator — typically a wind farm, solar farm, or other clean energy facility — in which the company agrees to buy electricity at a fixed price over a set period, usually between 10 and 20 years.
That's the core of it. The company isn't buying solar panels or wind turbines. It isn't building anything. It's buying the output — the electrons, or more precisely, the contractual right to claim those electrons and the renewable energy certificates (RECs) that come with them.
The fixed price is the point. Grid electricity prices fluctuate constantly, subject to fuel costs, weather, geopolitical shocks, and regulatory changes. A PPA lets a company lock in a rate today for energy it will consume years from now, which does two things at once: it puts a ceiling on energy cost volatility, and it creates a traceable, auditable link between the company's energy consumption and a specific renewable energy source.
For companies with net-zero commitments, science-based targets, or RE100 membership, that traceability is increasingly non-negotiable. Unbundled RECs — certificates purchased separately from any specific power source — have come under growing scrutiny from sustainability standard-setters. A PPA offers what an unbundled REC can't: a direct contractual relationship with the generator, which provides the additionality and provenance that serious climate accounting frameworks now demand.
The electricity grid doesn't work like a direct pipeline. When a wind farm in Texas generates power, it doesn't flow through a dedicated wire to a corporate headquarters in Ohio. It goes into the grid, mixes with everything else, and the company in Ohio draws from whatever the grid is supplying at that moment.
So how does a PPA create a meaningful clean energy claim?
Through the contract and the certificates. When a company signs a PPA with a wind farm, it agrees to pay a set price per megawatt-hour (MWh) for the farm's output over the contract term. In return, it receives the RECs associated with that generation — one REC per MWh — which it uses to make market-based Scope 2 emissions claims under the GHG Protocol Scope 2 Guidance. The physical electrons may go anywhere on the grid, but the environmental attributes of that generation belong to the buyer.
In a physical PPA, the generator delivers power directly to the buyer through a utility or transmission arrangement. A recent example: a 100 MW solar installation in Elkhart County, Indiana, is supported by a long-term physical PPA with Indiana Michigan Power, part of American Electric Power — one of two utility-scale facilities that added a combined 200 MW to the U.S. grid earlier this year.
In a virtual PPA (also called a financial PPA or VPPA), no power changes hands at all. The contract is settled financially: the buyer pays the agreed fixed price, the generator sells into the wholesale market at spot, and the difference is settled between the parties. Either way, the buyer receives the RECs and can make its clean energy claim. VPPAs are the more common structure for corporate buyers who aren't in the business of managing power delivery.
Physical On-Site PPA
The generator builds and operates a renewable energy system on the buyer's property — rooftop solar is the most common example. The buyer purchases the output at a fixed rate. No grid complexity involved.
Best for: companies with significant owned or leased facility footprints and available roof or land space.
Physical Off-Site PPA
The generator is a utility-scale facility located elsewhere. Power is delivered through the grid. The buyer claims the associated RECs.
Best for: large industrial buyers with high, consistent energy loads and appetite for transmission logistics.
Virtual PPA (VPPA)
A purely financial contract. No physical delivery. The buyer receives RECs and the financial hedge against spot market volatility.
Best for: companies in deregulated markets that want the Scope 2 accounting benefits and price stability without managing physical delivery.
Sleeved PPA
A variation in which a utility acts as an intermediary, "sleeving" the renewable power to the buyer through the existing utility relationship. Simplifies delivery logistics.
Best for: buyers in regulated markets where direct PPAs are complex or restricted.
PPA Types at a Glance
| Type | Physical Delivery | RECs Included | Complexity | Typical Buyer |
|---|---|---|---|---|
| On-Site Physical PPA | Yes | Yes | Low | Facility owners with available roof or land |
| Off-Site Physical PPA | Yes | Yes | High | Large industrial buyers with high, consistent loads |
| Virtual PPA (VPPA) | No | Yes | Medium-High | Corporate buyers in deregulated markets |
| Sleeved PPA | Yes | Yes | Medium | Buyers in regulated markets needing utility intermediary |
PPAs are not universally the right tool. They're the right tool for a specific profile of buyer, and being honest about that profile upfront saves a lot of time.
You're likely a good candidate if:
A PPA is probably not the right starting point if:
One more thing worth saying here: a PPA is not a substitute for an energy strategy. As we've reported, most organizations have an energy plan — fewer have an energy strategy built on current infrastructure realities rather than grid conditions from three years ago. A PPA signed without that strategic context is a contract in search of a rationale.
The corporate PPA market is also more complicated to navigate than it was even two years ago. Global clean energy procurement volumes fell 10% in 2025 — the first decline in nearly a decade — and technology giants Meta, Amazon, Google, and Microsoft accounted for nearly half of all deals that did get signed. As we've reported, multinationals are increasingly splitting their procurement strategies by region as policy divergence between the U.S., Europe, and Asia Pacific makes a unified global approach increasingly difficult to execute.
That fragmentation is now being compounded by a tighter U.S. power market. AI data centers, hyperscalers, and other large-load customers are competing for many of the same renewable projects that manufacturers, retailers, hospitals, universities, public agencies, and mid-market buyers have historically pursued. At the same time, developers are facing interconnection delays, higher equipment and labor costs, and uncertainty around federal renewable energy incentives. Recent reporting has shown how competition for megawatts is already reshaping power access for manufacturers and data centers — a dynamic that also affects corporate renewable procurement strategy.
For mid-market buyers without hyperscaler budgets and dedicated procurement teams, that context matters. A PPA may still be one of the strongest tools available for renewable electricity procurement and market-based Scope 2 reductions, but the deal environment is tighter, more expensive, and less forgiving of underprepared buyers than it was when many long-term energy strategies were originally set. Smaller or less creditworthy buyers may need to evaluate aggregated PPAs, utility green tariffs, community solar, shorter-term REC strategies, or phased procurement alongside a traditional utility-scale PPA rather than assuming the same contract structures will be available on favorable terms.
|
|
Price certainty over a long horizon Energy markets are volatile. A 15-year contract at a fixed rate insulates a company from the kind of price spikes that have blindsided procurement teams in recent years. This is a real, quantifiable financial benefit — not just a sustainability talking point. |
|
|
Credible Scope 2 reduction Under the GHG Protocol's market-based accounting method, a PPA with delivered RECs is one of the strongest instruments available for reducing reported Scope 2 emissions. Standard-setters including the Science Based Targets initiative and RE100 recognize well-structured PPAs as qualifying instruments. |
|
|
Additionality A properly structured PPA with a new-build project supports the claim that the buyer's commitment helped bring new renewable capacity into existence — a distinction that matters increasingly as corporate climate claims face tighter scrutiny. |
|
|
Long-term developer financing PPAs provide revenue certainty that allows renewable energy developers to secure financing and build projects. Corporate buyers signing PPAs are, in a meaningful sense, helping to fund the clean energy buildout — which is precisely what standard-setters mean when they talk about additionality. |
|
This is the section most vendor materials skip. It's also the section where procurement teams learn the most expensive lessons.
|
|
Delivery shortfalls are a real and growing problem As of the end of 2025, over 2,060 gigawatts of generation and storage capacity were actively seeking grid connection in the U.S., according to Lawrence Berkeley National Laboratory's interconnection queue report. The median time from interconnection request to commercial operations has more than doubled — from under two years for projects built in 2000–2007 to over four years for those built in 2018–2024. As we reported in May 2026, interconnection queue delays, permitting backlogs, and construction cost inflation pushed a significant share of contracted renewable projects past their original commissioning dates — and the buyers absorbed the cost of sourcing equivalent supply from the spot market. |
|
|
The force majeure problem Many agreements executed during the high-volume procurement period of 2021 and 2022 include broad force majeure definitions that can encompass interconnection delays as supplier-excused non-performance. If interconnection delay qualifies as force majeure, the supplier is not in default, the buyer has no remedy, and the buyer absorbs the full cost of replacement power. Finance teams reviewing existing agreements need to understand which of their PPAs include this language — because it fundamentally changes their risk exposure. |
|
|
Basis risk in virtual PPAs is widening Basis risk — the difference in price between where the renewable project delivers into the grid and where the corporate buyer receives power — has always existed in VPPA structures. What's changed is the magnitude and volatility of that differential. BloombergNEF's 2025 analysis found that basis risk exposure widened significantly in 2023 and 2024, particularly in ERCOT and parts of PJM. During peak congestion events, nodal prices can go negative — meaning the project is effectively paying to deliver power the grid can't absorb. |
|
|
Curtailment and capture-price risk are getting harder to ignore In high-renewables markets, solar and wind generation can increasingly arrive when the grid does not need it, depressing prices or forcing generation to be curtailed. That matters for PPA buyers because the financial value of the contract depends not only on the agreed strike price, but on when the project generates, where it settles, whether it is curtailed, and how negative-price or low-price periods are handled. |
|
|
Volatility hasn't disappeared — it's moved Long-term energy contracts were supposed to reduce volatility. In 2026, volatility hasn't disappeared — it moved onto corporate balance sheets. Instead of exposure to commodity price swings, companies with PPAs may face basis risk, curtailment risk, load mismatch risk, and counterparty exposure. These risks show up in performance variance — often quietly, until a settlement period makes them visible. |
|
|
Developer creditworthiness matters enormously A 15-year contract is only as good as the counterparty on the other side of it. Due diligence on the developer's track record, financing structure, and balance sheet isn't optional. |
|
|
Contract complexity requires expert help PPA contracts are long, heavily negotiated documents with significant consequences for misunderstood terms. Buyers who sign without independent legal and technical advisory support routinely discover provisions they didn't understand — after it's too late to renegotiate. |
Under the GHG Protocol's market-based Scope 2 accounting method, a PPA qualifies as a valid instrument for reducing reported Scope 2 emissions if it meets the Scope 2 Quality Criteria. Those criteria require that the contractual instrument conveys specific renewable energy attributes from a known generator, that there is no double counting, and that the generator meets additionality standards.
A PPA that delivers RECs from a specific project generally meets these criteria, which is why it's considered a stronger instrument than unbundled RECs purchased on the open market.
For companies reporting under CSRD, SEC climate disclosure rules, or voluntary frameworks like CDP, the quality and documentation of PPA-linked RECs has become an area of increasing scrutiny. Buyers should ensure their contracts clearly specify the REC delivery mechanism and retain documentation sufficient for third-party verification.
It's also worth noting that a PPA addresses Scope 2 emissions — purchased electricity — not Scope 1 or Scope 3. Companies with net-zero commitments will need additional strategies beyond PPAs to address their full emissions profile. And a delivery shortfall doesn't just create a budget problem — it reduces the zero-carbon supply a company can claim, requiring replacement RECs at current market prices that may be higher than when the PPA was negotiated.
Another 2026 consideration is accounting uncertainty. The GHG Protocol's Scope 2 guidance is under revision, and the debate over more granular electricity accounting — including when and where clean power is generated relative to consumption — could affect how companies evaluate future PPA claims. Buyers do not need to wait for final guidance to act, but they should avoid assuming that today's market-based Scope 2 treatment will remain unchanged over the life of a 10- to 20-year contract.
This isn't a substitute for expert advisory support, but it's a reasonable frame for starting the evaluation process.
What is the main purpose of a PPA?
The main purpose of a PPA is to secure electricity and associated renewable energy certificates from a specific project under a long-term contract. For corporate buyers, the goal is usually a combination of renewable energy procurement, Scope 2 emissions reduction, and long-term electricity price visibility.
Does a PPA mean the company physically uses renewable electricity?
Not always. In a physical PPA, electricity may be delivered through a utility or grid arrangement. In a virtual PPA, no electricity is physically delivered to the buyer; the agreement is financially settled, and the buyer receives the RECs needed to support market-based Scope 2 claims.
Are PPAs only for very large companies?
Traditional utility-scale PPAs are best suited to organizations with large and predictable electricity demand, credit strength, and the ability to manage long-term contract risk. Smaller buyers may participate through aggregated PPAs, community solar, green tariffs, or shorter-term renewable energy procurement structures.
What is the difference between a PPA and buying RECs?
Unbundled RECs are purchased separately from the electricity generation that created them. A PPA links the buyer to a specific generation project and typically delivers both the renewable energy attributes and a stronger claim of project connection. That is why PPAs are often treated as higher-quality instruments than unbundled REC purchases.
What are the biggest risks in a PPA?
The biggest risks usually include basis risk, curtailment, project delays, under-delivery, REC shortfalls, termination penalties, accounting treatment, and counterparty credit risk. For VPPAs, the financial settlement risk can be as important as the clean energy benefit.
Can a PPA reduce Scope 1 or Scope 3 emissions?
No. A PPA addresses purchased electricity and therefore applies to Scope 2 emissions under market-based accounting. Scope 1 emissions require changes to owned or controlled operations, such as fuel switching or electrification. Scope 3 emissions require value-chain strategies such as supplier engagement, product redesign, logistics changes, and procurement standards.
Should a company sign a PPA before a project is built?
Many corporate PPAs are signed before a project reaches commercial operation, but that creates development and delivery risk. Buyers should understand the project's permitting status, interconnection position, financing, expected commercial operation date, force majeure language, and remedies if the project is delayed or never delivers as expected.
What should executives ask before approving a PPA?
Executives should ask whether the PPA matches the company's load profile, emissions goals, reporting obligations, risk tolerance, and financial controls. They should also ask who owns ongoing contract management, how performance will be monitored, and what happens if market prices, project output, or REC delivery differ from the assumptions used to approve the deal.
Environment+Energy Leader has covered corporate energy procurement and sustainability strategy since 2007. This explainer is updated periodically to reflect changes in market conditions, regulatory requirements, and industry practice.
