What Is a Power Purchase Agreement (PPA)
A power purchase agreement (PPA) is a long-term contract to buy electricity, usually at a defined price formula, often linked to a specific generator or portfolio. In the UK, corporate PPAs range from sleeved arrangements through licensed suppliers to purely financial contracts that hedge wholesale exposure without changing your physical import MPAN. Understanding which flavour you have matters for balance sheet treatment, REGO claims, and how Ofgem-licensed retail supply still fits around the edges.
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Key takeaways
- Not all PPAs change your bill layout: virtual structures hedge price while retail supply continues.
- Sleeved PPAs need a willing supplier: someone must integrate generator output with settlement.
- REGO transfer is contractual: verify documentation alongside marketing claims.
- Credit and collateral: generators price counterparty risk over a decade or more.
Physical, sleeved, and virtual PPAs in the UK context
Physical private wire projects connect generation behind or alongside your site; legal separation of wires and liabilities is material. Sleeved PPAs use a licensed supplier to “sleeve” power from an independent generator into your half-hourly profile, blending settlement complexity with brand-friendly renewable stories. Virtual PPAs are often financially settled swaps against a reference price—treasury may love the hedge while operations still see a conventional supplier invoice.
None of this removes the need to understand how business energy prices are set on the residual volume you do not cover, or how pass-through elements on your import contract behave.
Price formulas, basis risk, and policy charges
PPAs may fix a £/MWh escalator, track CPI, or embed floor and cap collars. Basis risk appears when the settlement index in the contract diverges from your retail supplier’s purchasing stack. Policy costs such as renewable obligation legacy costs, feed-in premium echoes, or supplier obligations may still flow through retail schedules depending on structure and vintage.
Climate Change Levy applies to taxable electricity supplied for business use; how a PPA allocates certificates or supply points should be reviewed by tax advisers. Do not assume green colour automatically changes levy treatment.
Due diligence: generation, offtake, and termination
Review generator performance warranties, curtailment rights, and force majeure clauses that reference grid outages or planning revocations. On the buyer side, volume flex clauses protect you if sites close or efficiency programmes cut load.
Align PPA ambition with simpler retail options discussed in green energy tariffs for business when scale does not justify transaction costs.
Governance and reporting
Large entities may fold PPA claims into SECR-style reporting or voluntary TCFD-aligned disclosures. Keep evidence packs that tie invoices, REGO retirement statements where relevant, and meter data to public claims.
PPA negotiation checklist
| Clause cluster | Ask | Why it matters |
|---|---|---|
| Tenor | Early termination £ | Balance sheet shock |
| Volume | Take-or-pay bands | Efficiency penalty |
| Price | Index + floor/cap | Basis risk |
| REGO | Transfer timing | Marketing proof |
| Supplier | Sleeving fees | Hidden £/MWh |
Legal, tax, and treasury coordination in the UK
PPAs touch company law authorisations, derivatives accounting for virtual structures, and sometimes state aid or subsidy questions on older assets. Engage solicitors who routinely work with sleeved supply templates accepted by your incumbent licensed supplier; bespoke drafts that nobody will sign waste fees. Treasury should model cash flows with the same rigour as FX hedges, including collateral calls if markets move against the structure.
From an energy operations perspective, keep a single register linking PPA volumes to MPAN settlement each month. Mismatches between sleeved energy and residual grid purchases confuse accruals and undermine carbon disclosures. If the generator underperforms, understand whether buyer-friendly volume flex exists or whether you must go to spot for shortfalls.
Change-of-law, curtailment, and grid emergencies
PPAs should spell out who bears policy cost shifts and curtailment when the system operator constrains output. UK examples in recent years remind buyers that legal text matters more than handshake trust. Review force majeure definitions to ensure they are mutual, not one-sided.
If your business downsizes, understand whether you can novate the PPA to a new offtaker or whether breakage fees apply—due diligence in M&A often misses energy contracts until weeks before completion.
A concise takeaway: if the legal and treasury teams cannot explain the PPA in one page, site managers will not operationalise it. Simplify or split structures until roles, meters, and invoices line up.
UK corporates should map PPA settlement against Balancing and Settlement Code metering classes where virtual structures settle differently from import MPANs—misaligned settlement can produce surprises in working capital even when the headline p/kWh looks stable. If parent guarantees are requested, treat them like bank covenant events: model downside scenarios where power prices move against you and collateral calls coincide with other liquidity stress.
File counsel’s one-page PPA summary with annual board packs so new directors inherit the same risk story treasury signed—oral handovers miss breakage triggers every time.
Related guides
Read REGO certificates explained, flexible vs fixed energy contracts, and the energy hub.
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