Oct 2026 1 Oct 2026 – 31 Oct 2026 Updated 8th November 2026
Total benefit
£232
Saved on bills
£216
Earned exporting
£16
Top solar day
29.5
kWh on 8 Oct 2026
Solar generated
536
kWh · 75% used at home
Battery discharged
543
kWh · £105 of the saving
Exported
135
kWh sold back to the grid
EV charging
£19
245 kWh · not counted as saving
Would have paid
£283
with no solar and no battery
Actually paid
£67
before export payments and standing charge
Household use
1,007
kWh · 37% not bought from the grid
Paid back
24%
£4,536 of £18,990 · 5.5 yrs to go
Heating
322
kWh · £9 of the bill
By day 1 Oct → 31 Oct
Solar Used Battery Exported Benefit (£) Cash flow (£)
45 0 kWh £12 0 −£6

This tool was built with Claude

Every line of it — the Octopus and AlphaESS clients, the settlement model, this screen — was written in conversation with Anthropic's Claude. Here is what that cost.

Tokens
110.8million
across 364 requests · measured
Electricity
2.3kWh
estimated · 0.7–8.3
Carbon
294g CO₂e
estimated · 83–1,039
Fresh water
2.5litres
cooling only · 0.7–9.0

Roughly 8.0% of what this roof made on its best day.

Only the token count is measured. Anthropic publishes no per-token energy figures, so the rest is inferred from Google's first-party measurements of its own models and from published per-token estimates — two methods that disagree by about ninety times, which is why these are ranges and not numbers. The water figure covers datacentre cooling only, not the water used to generate the electricity, so read it as a floor. Model training is excluded: it is shared across everyone who ever uses the model and cannot be fairly attributed to one project.

By day 1 Oct → 31 Oct
Solar 535kWh Used 1,008kWh Battery 543kWh Exported 135kWh Benefit (£) £232 Cash flow (£) −£51
45 0 kWh £12 0 −£6
1 Oct 4 Oct 7 Oct 10 Oct 13 Oct 16 Oct 19 Oct 22 Oct 25 Oct 28 Oct 31 Oct