Try it on real data
Read one day through today’s grid.
Pick a household and we replay its day on the same real data the app uses (JEPX price · TSO carbon). Usage is sample; the grid numbers are real.
Family of 3 + EV — Kyoto
Detached house; electric car charged overnight.
Single, apartment — Tokyo
Small flat — mostly a fridge and evening lights.
Couple, condo (AC summer) — Fukuoka
Daytime air-conditioning through a hot summer day.
Couple, condo (AC summer) — Fukuoka
Monday
Rain · 26°/19° · 6.1h sun
More cloud than sun — the grid leaned on thermal longer; cleanest around 11:00.
In this home
Air conditioner
Fridge
Electric water heater
20.2kWh
Usage
¥213
Cost
4.8kg
CO₂
240W
Standby
:006:0012:0018:0024:00
Usage
Grid carbon
Cleanest 2h
Cheapest 2h
Move the peak (12:00) into the cheapest window (11:30) to save ≈ ¥5 · 0.02 kg CO₂.
20.2 kWh this day. The 2-person average nearby is ≈ 12.4 kWh/day (e-Stat FY2021) — +63%.
Usage is sample data. Carbon and price are real (Kyushu, 2026–06–15, JEPX and the regional TSO).
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