What You Need To Know About Power Purchase Agreements (2026 Updated)

If you're buying electricity for your business (or generating it), you've probably noticed that "energy contracts" can get complicated fast.

That's where Power Purchase Agreements (PPAs) come in. A well-structured PPA can give you cost certainty, help you hit sustainability targets, and make projects bankable. A poorly drafted one can leave you stuck with unexpected costs, delivery gaps, and disputes you didn't see coming.

In this 2026-updated guide, we'll break down what a PPA is, how it typically works in the UK, and the legal points you'll want to get right before you sign.

What Is A Power Purchase Agreement (PPA)?

A Power Purchase Agreement (PPA) is a contract where one party agrees to sell electricity and the other agrees to buy electricity on agreed terms (usually price, volume, and duration).

PPAs are common in renewable energy because they can provide predictable revenue for a generator (helping finance the project) and predictable costs and "green" credentials for the buyer.

Who Are The Parties In A Typical PPA?

• Generator / Seller: the party producing electricity (often solar, wind, hydro, AD, etc.).
• Offtaker / Buyer: the party buying the power (often a business aiming to lock in price and renewable supply).
• (Sometimes) A Supplier / Sleeving Provider: a licensed supplier may "sleeve" the power into the buyer's supply arrangements, depending on structure.

Common Types Of PPAs In The UK

In practice, "PPA" can describe a few different structures. The right one depends on your site, your risk appetite, and your operational reality.

• On-site / Behind-the-meter PPA: the generator is installed at (or near) your premises (e.g. rooftop solar), and power is used on-site.
• Off-site / Virtual PPA (vPPA): the generator is elsewhere and you agree a contract-for-differences style arrangement, often with settlement against a market reference price.
• Private-wire PPA: power is delivered via a direct cable arrangement (more common for adjacent or co-located sites).
• Sleeved PPA: a supplier sits in the middle to manage delivery through the grid and handle balancing/settlement mechanics.

Because these structures have different regulatory and operational moving parts, the legal drafting needs to match what's actually happening "on the ground" (and what each party is taking responsibility for).

Why Businesses Use PPAs (And What They're Really Trying To Achieve)

Most businesses don't sign a PPA just because it sounds sophisticated. They sign one because they want a specific outcome.

Common Commercial Drivers

• Budget certainty: locking in pricing (or a pricing formula) for part or all of your consumption.
• Renewable credentials: supporting ESG reporting, net zero targets, customer requirements, and supply chain expectations.
• Additionality: helping fund new renewable generation (particularly relevant for certain sustainability claims).
• Risk allocation: agreeing up front who carries market price risk, volume risk, and operational risk.

Why The Contract Matters More Than The Headline Price

Two PPAs can have the same ??/MWh? headline price but totally different outcomes if they treat risk differently.

For example:

• If generation is lower than expected, do you pay anyway?
• If your site's demand drops (new processes, relocation, closure), are you still locked into minimum volumes?
• If the grid connection is delayed, who pays for the months you can't receive power?
• If the law changes and costs increase, who absorbs that change?

This is why it's worth treating a PPA like a core commercial contract (not a utility sign-up). The basics of what makes a contract legally binding still apply - but PPAs typically add more complex operational obligations and risk-sharing than many businesses expect.

Key Legal Issues To Get Right In A UK PPA (2026 Update)

PPAs sit at the intersection of contract law, energy market mechanics, compliance, and (sometimes) property and construction arrangements. You don't need to become an energy lawyer overnight - but you do want to understand the main "pressure points".

1. Contract Structure: What Exactly Are You Buying?

Start with clarity:

• Is the buyer purchasing physical electricity, or is it a financial settlement (as in many virtual PPAs)?
• Is there a supplier "sleeving" the power - and if so, is that relationship documented separately?
• Are you also buying environmental attributes (for example, REGOs), and on what terms?

If the parties aren't aligned on this from the start, disputes later can be surprisingly basic: "we thought we were buying X, but the contract delivers Y".

2. Term, Volume, And Pricing: Where Disputes Often Begin

Most PPA negotiation time goes into three areas:

• Term: often 5?15+ years (sometimes longer).
• Volume: fixed volume, "pay as produced", baseload, shaped, or minimum take-or-pay arrangements.
• Pricing: fixed, index-linked, floor/cap, or a formula (particularly in vPPAs).

From a legal perspective, the key is to define the price mechanics with enough detail that someone can calculate the invoice without guesswork.

Also watch out for "reasonable" pricing adjustments or loosely defined re-openers - if you do use softer language, make sure it's anchored to objective rules or evidence. Clauses built around commercially reasonable efforts can work well, but only if it's clear what the parties must actually do in practice.

3. Change In Law, Taxes, And Regulatory Cost Pass-Through

Energy is heavily affected by regulation, network charges, and market rule changes. A good PPA will spell out:

• what counts as a change in law (including new charges, levies, or compliance requirements);
• who pays for the change (seller, buyer, or shared);
• what happens if the change makes performance illegal or commercially unworkable (renegotiation, termination, adjustment mechanism).

In 2026, this is still one of the most important "future-proofing" parts of the deal. If it's vague, you can end up arguing about costs for years.

4. Performance Risk: Availability, Curtailment, And Force Majeure

Renewables can be variable, and the grid can constrain delivery. Your PPA should clearly define:

• availability guarantees (if any) and how they are measured;
• curtailment (when generation is reduced due to grid constraints or instructions) and who bears the cost;
• force majeure events (what qualifies, how long relief lasts, and when termination is triggered).

One practical tip: make sure the contract distinguishes between "can't generate" and "can generate but can't deliver". Those are different risks, and they often get bundled together in sloppy drafting.

5. Credit Support And Security (Because PPAs Are Long-Term)

A long-term PPA is only as strong as the parties? ability to perform for the next 10+ years.

Credit support commonly includes:

• parent company guarantees;
• letters of credit;
• cash deposits;
• step-in rights for funders (common on generator side).

This is also where you'll see negotiation around caps and exposure limits - which should align with your broader approach to limitation of liability in commercial contracts.

6. Data, Metering, And GDPR (Often Overlooked)

PPAs rely on metering and settlement data. Depending on the structure, you might be exchanging:

• half-hourly consumption/generation data;
• site identifiers and account details;
• contact details of operational staff;
• access details for monitoring portals.

Some of this may be personal data (even if the PPA is a business-to-business contract). If personal data is involved, you should make sure your broader compliance approach is consistent with your Privacy Policy and internal data handling practices.

Where a party is processing personal data on behalf of another (less common in a straightforward PPA, but it can arise), you may need appropriate contractual terms to reflect UK GDPR and the Data Protection Act 2018.

What Should A PPA Include? A Practical Checklist For Buyers And Sellers

Every project is different, but most UK PPAs will need to deal with the following clauses in a clear, operational way.

Commercial And Operational Terms

• Definitions that match the market reality (especially around metering, settlement periods, and reference prices).
• Contracted quantity and how volumes are measured and reconciled.
• Price and the full pricing formula (including indexation, caps/floors, and timing of adjustments).
• Billing and payment terms, late payment interest, dispute process for invoices.
• Metering standards, access rights, testing, and what happens if data is missing or wrong.
• Balancing and shaping responsibilities (particularly in sleeved arrangements).
• Environmental attributes (e.g. REGOs) - ownership, transfer process, timing, and restrictions on double counting.

Risk Allocation Clauses

• Force majeure (relief, notification, mitigation, long-stop termination).
• Change in law and pass-through of new costs.
• Curtailment and network constraints (who bears the risk and what compensation applies).
• Performance guarantees and remedies (liquidated damages, price adjustments, termination).
• Events of default and termination rights (including insolvency and material breach).

Legal Mechanics That Make The Contract Enforceable

Don't underestimate the "admin" side of a PPA - this is where enforceability and dispute outcomes are often decided.

• Authority to sign (who can bind each party).
• Execution formalities (especially if any documents are executed as deeds or involve security).
• Notice provisions (how notices must be served, and when they're effective).
• Governing law and jurisdiction (typically England & Wales, but confirm).

If execution needs to be done as a deed (or you're unsure whether it should be), it's worth getting the signing blocks and formalities right from the start - executing contracts and deeds incorrectly can create real enforceability headaches later.

And as with any commercial arrangement, the PPA should fit within a coherent contracting approach - the basics of UK contract law still underpin how your rights and remedies will work if something goes wrong.

Common PPA Pitfalls In 2026 (And How To Avoid Them)

PPAs are often negotiated under time pressure - a project is about to start, funding is conditional on offtake, or a buyer has board-level emissions targets to meet.

Here are some of the most common pitfalls we see businesses run into, and the practical ways to reduce the risk.

Pitfall 1: Vague Volume And Settlement Rules

If your PPA is unclear on volume, shape, or settlement methodology, you can end up with:

• unexpected imbalance costs,
• ongoing invoice disputes,
• mismatched expectations about what the "price" really covers.

How to avoid it: make the settlement process boringly specific. Include worked examples if necessary. Define what happens when data is missing, corrected, or delayed.

Pitfall 2: Treating Curtailment As An Afterthought

Curtailment risk can materially affect project economics (for generators) and renewable claims (for buyers).

How to avoid it: define curtailment categories and their consequences. For example, grid-instructed curtailment may be treated differently from curtailment caused by the generator's own issues.

Pitfall 3: "Change In Law" Clauses That Are Too Broad (Or Too Narrow)

If the clause is too broad, one party may end up with an open-ended ability to pass through costs. If it's too narrow, the contract may become uneconomic and lead to termination or dispute.

How to avoid it: use clear definitions and a balanced adjustment mechanism. Consider including an escalation pathway (good-faith negotiations, expert determination) before termination is triggered.

Pitfall 4: No Clear Remedy Framework

When something goes wrong, your contract should answer:

• What is the remedy?
• How is it calculated?
• Is it the exclusive remedy or can the non-breaching party sue for additional losses?

How to avoid it: align your remedy framework with your commercial risk appetite, and make sure it integrates cleanly with your liability caps and exclusions.

Pitfall 5: Not Stress-Testing "Exit Scenarios"

It's easy to sign a 10?15 year PPA when business is stable.

But what happens if:

• you move premises,
• you sell the business,
• your energy demand drops,
• the generator is refinanced or sold,
• the project is delayed and doesn't reach commercial operation on time?

How to avoid it: negotiate assignment rights, step-in rights, termination triggers, and clear consequences (including termination payments) with those real-world scenarios in mind.

Key Takeaways

• A PPA is a long-term contract for the sale and purchase of electricity, and it needs to clearly reflect whether you're buying physical power, financial settlement, and/or environmental attributes.
• The headline price isn't the whole story - volume risk, curtailment, change in law, and performance obligations usually determine whether the deal is "good" in practice.
• Your PPA should be operationally precise on metering, settlement, billing, missing data, and dispute processes to avoid ongoing invoice disagreements.
• Change in law and regulatory cost pass-through clauses should be carefully defined and balanced, especially for long-term contracts signed in a shifting policy environment.
• Credit support and liability allocation need to match the length and risk profile of the arrangement, so you're protected if the other party can't perform.
• Execution formalities matter - if the signing process is wrong (particularly where deeds or security are involved), enforceability can become a problem when you least want it.

If you'd like help reviewing or negotiating a PPA (or putting the right contract structure in place around your energy project), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.