Bigger house load, smaller net bill.
A paying ChargeSync customer: an all-electric family home on Octopus Agile, using the household’s own Octopus figures for 2025 and 2026 to date. The house added a second EV in December 2025 and still imported less, paid less per unit and earned far more from export. Net electricity cost for January to August fell from £2,178 to £1,221, 44% lower. A better export rate, the weather and the household’s own load-shifting account for part of the change.
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Less bought, more sold, and bought cheaper.
January to August, 2025 against 2026, pounds excluding VAT.
£2,178 to £1,221, £957 lower. ~£1,000 lower over the full year once September to December forecasts are included.
£528 to £984 on 39% more kWh exported, at an average 13.9p/kWh from 10.4p. Part of the rise is that better export rate; the battery also sells into the evening peak, not just when the sun is out.
£2,706 to £2,205 with a second EV on charge for all of 2026, at an average 16.2p/kWh from 18.3p. More of the home’s energy bought when Agile is cheap.
Net electricity cost by month, £ excluding VAT. 2026 September is actual to 21 September plus forecast; October to December are the household’s forecasts.
Winter is where the battery does the heavy lifting.
January to March net cost fell from £1,617 to £960. The battery rarely earns in those months, but it moves the house off the 4 to 7pm peak by charging when Agile is cheap and running the home from storage when it is not. Every month of 2026 to August came in below the same month of 2025.
Paid to charge, paid to discharge.
Not an everyday result, but the same logic runs every half hour. Over a week or a month it closes the gap between what the house spends and what it earns.
+£2.90 to import
The meter recorded 122.37 kWh of import across an extended negative-price window, and the household was paid for it. The battery, both EVs and the appliances were charged or run from it while solar covered the home’s own demand.
+£4.71 for the evening peak
Between 16:30 and 19:30 the battery sold 21.3 kWh back at about 22p/kWh, more than double the household’s 2025 average export price.
£7.61 earned for the day
Import paid for, export paid for, and the house ran on its own solar in between.
“The direction of travel is as you would hope, i.e. that the earnings are up and the costs to the consumer are down … I attribute a lot of that to better, more granular dispatch of ChargeSync.”
The customer, all-electric home on Octopus Agile, September 2026
One home, honestly counted.
- Year-on-year results also reflect weather, solar radiation, wholesale prices and a higher export rate (13.9p/kWh against 10.4p), not ChargeSync alone.
- The household shifts washing, the dishwasher and car charging to cheap Agile slots by hand as well.
- Solar generation is not tracked by the supplier, so self-consumed solar is not shown.
- All figures exclude VAT and the £10 ChargeSync subscription, and are rounded to the nearest pound. September to December 2026 are forecasts; the headline uses January to August actuals only.
- This is a larger home than the 10 kWh solar-and-battery home our savings ladder models. Individual results vary with home, equipment, tariff and usage.
Source: the household’s Octopus Energy account data for 2025 and 2026 to 21 September, shared with ChargeSync.
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