Energy Cost Calculator

Supplier offers rarely line up cleanly on first inspection. One quote loads more onto the unit rate, another sits on a heavier standing charge, a third bakes in a non-commodity pass-through that only becomes visible months in once the first reconciliation lands. Reducing every offer to total £ at the consumption you actually use is the only honest comparison, and the standing-charge difference is the variable that most often hides the real ranking when the figures are read off the top of a quote.

On a 250,000 kWh per year site, a 2 p/kWh swing on the unit rate is £5,000 per year, and a £200 per year standing-charge gap is rounding error against it. On a 50,000 kWh per year SME, the same standing-charge gap is a quarter of the total spend differential, and the offer that looked cheapest on the unit rate may not be. The maths reverses around mid-market scale, which is where most decisions go wrong if they are made on headlines alone.

Purely Energy tenders to 30+ suppliers and presents every offer on the same total-£ basis at your actual consumption profile, with wholesale, non-commodity, supplier margin and our margin shown separately on the same page. Where the offer looks attractive but the structure is fragile (pass-through ratchets, end-of-term price step-ups, capacity assumptions that do not match your half-hourly profile), we flag it before the contract is signed, not after the bill arrives, so the offer that wins the tender is the offer that actually performs over the term.