PPA offtaker: what it means and how your covenant sets the tariff
An offtaker is the buyer in a power purchase agreement: the business that commits to take, and pay for, a generator's electricity for the length of the contract. In a solar PPA the offtaker is you, and the provider funding the array is relying on your payments for 15–25 years, which is why your covenant sets the tariff you are offered.
What is an offtaker?
An offtaker is the party that buys a producer's output under a long-term agreement. In energy, the offtaker is the buyer in a power purchase agreement: the business or supplier that commits to take, and pay for, a generator's electricity (or its financial value) for the length of the contract. In a commercial solar PPA, the offtaker is the business whose site uses the power, which is usually the company that owns or occupies the building.
The word comes from commodity markets, where an offtake agreement is a contract to buy part of a mine's, plant's or farm's future production before it exists. The logic is the same in every sector. A committed buyer turns uncertain future output into contracted revenue, and lenders will finance a project against contracted revenue. You will see it written as "offtaker", "off-taker" or "off taker"; all three mean the same thing.
Offtaker, generator and supplier: who does what
Most confusion about PPAs comes from not knowing which party does what. There are two parties at the core of every deal and, in some structures, two more behind them.
| Party | Role | On-site solar PPA | Sleeved off-site PPA |
|---|---|---|---|
| Generator (seller) | Owns and runs the asset and sells its output | The provider's project company that owns the array on your roof | The owner of the solar or wind farm |
| Offtaker (buyer) | Commits to buy the output, or its value, at the agreed price | Your business, buying the solar units your site uses | Your business: the contracted buyer the farm is financed against |
| Licensed supplier | Delivers power over the public network and balances it | Not needed for the solar units; your existing supplier still supplies the rest of your demand | Takes the farm's output and delivers it to your meters for a fee |
| Lenders and investors | Fund the generator, relying on the offtaker's payments | Fund the project company | Fund the farm |
The supplier's charge in a sleeved deal is covered in what a sleeving fee pays for. For how the whole contract fits together, start with what a power purchase agreement is.
What an offtaker commits to
Signing as the offtaker is a long commitment, and the obligations go further than paying the bill. Before you sign, check how the contract handles each of these.
- The term. This site's indicative bands are 15–25 years for on-site deals and 10–15 years off-site. The provider needs long enough to recover the cost of the asset from your payments.
- The volume. On-site solar PPAs are usually pay-as-produced: you buy what the array generates and your site uses. Off-site deals can also be as-produced, or shaped into fixed blocks.
- The price path. Fixed for the term, fixed with an annual escalator, or indexed to inflation. How escalators change the price decides most of the long-run cost.
- Credit support. If your covenant is not strong enough on its own, providers ask for a parent company guarantee, a letter of credit or a deposit.
- Site obligations (on-site). Access for maintenance, keeping the roof available and unshaded, notice of planned roof works, and insurance responsibilities.
- What happens if you move or sell. The PPA usually passes to a buyer only with the provider's consent. Selling a business with a PPA in place explains what a buyer will ask for.
The provider's side of the commitment, and why it lends against yours, is set out on how solar PPA financing works.
What "off-taker covenant" means
The PPA SPV raises capital based on the certainty of your future kWh payments. The stronger your credit (the lower the chance you'll default on monthly bills), the cheaper their capital, the lower the tariff they can offer.
The covenant ladder
| Tier | Examples | Indicative tariff impact (this site's estimate) |
|---|---|---|
| Investment-grade rated (BBB- or better) | FTSE 100/250, NHS Trusts, major retailers, councils | Headline tariff |
| Strong unrated | Top-50 private companies, established mid-caps with audited accounts | +0.5–1 p/kWh |
| SME with parental guarantee | Mid-size with a strong UK or international parent | +1–2 p/kWh (or no deal without guarantee) |
| SME no guarantee | Most £5–20m revenue businesses | +2–4 p/kWh or shorter term required |
| Sub-investment-grade | Loss-making, distressed, or single-customer-concentration | Usually no deal |
The tariff-impact column is this site's indicative advisory estimate of how providers price covenant, not published market data. Your actual offer depends on the provider, the term, the site and the security you can offer.
How to strengthen your covenant for the PPA
- Group guarantee from a stronger parent (most common).
- Step-up tariff in the early years (provider takes more risk later when your covenant has hopefully strengthened).
- Letter of credit or cash deposit (typically 3–6 months of expected payments).
- Take a shorter contract to reduce the provider's risk window.
Offtaker questions
What is an offtaker?
An offtaker is the party that buys a producer's output under a long-term agreement. In a power purchase agreement it is the buyer: the business or supplier that commits to take and pay for a generator's electricity, or its financial value, for the contract term.
What does offtaker mean in a PPA?
In a PPA the offtaker is the electricity buyer. In an on-site solar PPA that is the business using the power on its own site. In an off-site deal it is the business whose commitment the generator finances its farm against, even when a licensed supplier delivers the power.
Is the offtaker the buyer or the seller?
The buyer. The generator, or the provider's project company that owns the array, is the seller; the offtaker takes the output and pays for it.
What is an offtake agreement?
An offtake agreement is a contract to buy part of a producer's future output before it is produced, whether that is a mine's ore, a plant's product or a generator's electricity. A power purchase agreement is the electricity version.
Why does the offtaker's credit rating matter?
Because the generator's lenders rely on the offtaker's payments to repay the finance for the asset. A stronger covenant lowers their risk and so the tariff they need. A weaker one means a higher tariff, extra security such as a parent company guarantee, or a shorter term.
Can a small business be a PPA offtaker?
Yes, if a provider will accept its covenant. Businesses without a credit rating are often asked for a parent company guarantee, a deposit or a shorter term, and some providers set a minimum system size. The form on this page gives a provider enough to say whether your site qualifies.
Not sure if your covenant qualifies?
Send us your basic financials (last 2 years of accounts) and we'll match you to providers comfortable at your tier.
Get an indicative PPA tariffWhere you sit on that ladder is worth real money in pence per kilowatt-hour, and the five covenant tiers and their tariffs shows roughly what each rung is priced at.
The larger the commitment, the harder the credit question becomes: the covenant test at 2 MWp typically means a full 25-year term or a parent-company guarantee, plus group electricity spend of £750,000 or more.
Covenant strength decides your tariff, but it does not decide who absorbs a future policy shift — that sits in the change-in-law clauses in UK PPAs, which you should read before signing.
Weaker covenants are priced up and papered more tightly, which is where step-in rights and lender protections enter the negotiation.
Covenant strength is the whole basis on which a corporate PPA is priced, which is why group guarantees come up so early in those negotiations.
Funders assess security over the asset as well as the buyer, and part-funded assets complicate that security in ways worth understanding before you apply for a grant.
Covenant strength and contract term are priced together, and the PPA rates by contract term table shows how the typical tenure lengthens as system size — and usually covenant — increases.
Get your site assessed for a solar PPA
PPA offtaker: what it means and how your covenant sets the tariff — tell us about your site and we'll return an indicative p/kWh tariff for it. Reply by email within one working day.