Take-or-Pay in a PPA: What It Means and When It Bites
Take-or-pay commits a PPA buyer to a minimum volume, taken or not. How it differs from take-and-pay and pay-as-produced, and what to negotiate.
Every power purchase agreement has to answer a simple question: what happens if the buyer does not take the power? The answer sits in the volume clause, and in some deals it is a take-or-pay clause. Understanding it before you sign matters more than the headline price, because it decides what you owe in the months your site cannot use the output.
What take-or-pay means
Under a take-or-pay clause the buyer commits to a minimum volume. If it takes less, it still pays for the shortfall, often at the contract price or an agreed proportion of it. The clause gives the seller a guaranteed minimum revenue, which is what lenders look for when they finance a generator. The same idea runs through long-term contracts for gas, liquefied natural gas and other commodities.
The alternatives
| Volume basis | What you commit to | Who carries the volume risk |
|---|---|---|
| Take-or-pay | Pay for a minimum volume whether or not you take it | Mostly you |
| Take-and-pay | Pay only for what you actually take | Mostly the generator |
| Pay-as-produced | Buy whatever the system generates, as it generates it | Shared: you take the output profile, the provider takes the generation risk |
| Shaped or baseload | Buy a fixed profile, with someone balancing the difference | The party that balances |
Most on-site solar PPAs are closest to pay-as-produced: you buy what the array on your roof generates and your site uses. Take-or-pay matters most in deals where the generator has spent heavily to reach you, such as a private wire PPA.
Take-or-pay in private wire deals
The Welsh Government's 2026 guidance on private wires notes that private wire PPAs often include a take-or-pay clause, which ensures the generator can sell a minimum amount of electricity or receive compensation if the consumer cannot take it. It also notes that where the generator funded the cable, the PPA will generally not include a minimum supply requirement. Cardiff Council's Lamby Way solar farm is an example: its 20-year PPA with a neighbouring business is take-and-pay, with no minimum, because the farm can switch its output to the grid.
Source: Welsh Government — Private wire energy systems: guidance (29 June 2026) (sections 4.1 and 2). Verified 28 Sep 2026.
What to negotiate
- The minimum. Tie it to a realistic share of your lowest expected demand, not your average.
- Relief events. Planned shutdowns, force majeure and grid outages should reduce the minimum, not count as shortfall.
- The shortfall price. Paying the full tariff for units you never received is the most expensive version; a lower rate or a carry-forward is common ground to ask for.
- Site changes. If you sell, close or change the use of the site, what happens to the commitment, and can it transfer to a buyer?
How the whole contract fits together, including price, term and the other main clauses, is in our guide to what a power purchase agreement is.
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