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.
Family of 3 + EV — Kyoto
Monday
Rain · 26°/18° · 3.5h sun
More cloud than sun — the grid leaned on thermal longer; cleanest around 12:30.
In this home
EV (PHEV)
Solar PV
Home battery
Heat-pump water heater
Air conditioner
32.8kWh
Usage
¥406
Cost
10.9kg
CO₂
360W
Standby
:006:0012:0018:0024:00
Usage
Grid carbon
Cleanest 2h
Cheapest 2h
Move the peak (01:00) into the cheapest window (06:30) to save ≈ ¥4 · 0.46 kg CO₂.
32.8 kWh this day. The 3-person average nearby is ≈ 14.2 kWh/day (e-Stat FY2021) — +131%.
Usage is sample data. Carbon and price are real (Kansai, 2026–06–15, JEPX and the regional TSO).
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