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The Ofgem price cap rose to 26.11p per kWh for standard variable electricity from 1 July 2026, and every penny of that rise makes a solar system's self-consumed power more valuable

The July-to-September 2026 cap period pushed the average direct-debit electricity unit rate to 26.11p per kWh, with the October-to-December rate still to be confirmed by Ofgem by 26 August 2026, and predictions currently pointing to a slight fall rather than a further rise.

30 July 2026 · Source: Ofgem

The price cap doesn't set what you actually pay, it sets the maximum a standard variable tariff can charge, but it's the number that moves most household electricity bills up or down each quarter. At 26.11p per kWh for July to September, every unit of grid electricity you don't need to buy because your panels supplied it instead is worth more than it was the previous quarter, and that arithmetic runs the same direction regardless of which supplier or tariff you're actually on.

This is the part that's easy to lose in solar payback calculations done even a year or two ago: the value of self-consumption isn't fixed, it moves with the price cap, and the cap has moved up more often than down over the past several years. A system sized and priced against an older, lower unit rate is quietly outperforming its original payback estimate every time the cap rises, which is a genuine tailwind for anyone who installed before this rise and a factor worth including for anyone pricing a new system now rather than assuming today's rate holds steady.

The October 2026 rate is still unconfirmed, Ofgem publishes it by 26 August, and current predictions lean toward a slight fall rather than another rise. Even if that holds, it doesn't undo the case for self-consumption, it just means the specific saving per unit shifts slightly quarter to quarter. The structural point, that you're insulated from cap movements entirely for whatever share of your usage your panels cover, doesn't depend on which direction the next announcement goes.

Battery storage is where this compounds rather than just applies once. Without a battery, self-consumption is limited to whatever you're using while the sun's actually out. With one, you shift more of your daily usage away from cap-priced grid electricity entirely, which means a battery's value case gets marginally stronger every time the cap rises too, not just the panels' own payback.

Read the original: Ofgem. Commentary is Sandwich Solar's own editorial view; the original reporting is credited to its publisher.

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