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What a battery or a solar plant would have earned
A few assets on sale today, on the real French day-ahead prices since 1 January 2017. Pick one to read it year by year, month by month and day by day.
| Asset | Earned in 2025 |
|---|---|
|
Tesla Powerwall 3, home battery
13.5 kWh, charging at up to 5 kW and discharging at up to 11.5 kW, on a tariff that would follow the day-ahead price quarter-hour by quarter-hour.
|
€500 |
|
Tesla Megapack 2 XL, grid battery
One container of 3.85 MWh and 1.93 MW, buying on the French day-ahead market and selling there later in the day.
|
€147,081 |
|
Solar plant in Paris
1 MWp of panels in Paris, each quarter-hour's output sold at its day-ahead price.
|
€38,893 |
|
Solar plant in Marseille
1 MWp of panels in Marseille, each quarter-hour's output sold at its day-ahead price.
|
€61,244 |
|
Solar plant and Megapack in Paris
1 MWp of panels in Paris with a Megapack charged from them: what it does not store is sold at the quarter-hour's price.
|
€59,915 |
|
Solar plant and Megapack in Marseille
1 MWp of panels in Marseille with a Megapack charged from them: what it does not store is sold at the quarter-hour's price.
|
€123,665 |
Gross cash flow of the day-ahead trades for one unit as described: two units earn twice as much.
Simulate further with a free account
The next five years on our calibrated price model, in a low, a base and a high scenario: the median and the conservative figure of each year, and the NPV and IRR on your own size and capex.
Indicative figures only
They come from simplified models: past prices, an asset as its datasheet describes it, and a battery that knows the next day's prices when it plans a day. Before any fee, tax, grid tariff or wear of the battery. They are neither a forecast, an offer nor investment advice.
A household in France does not trade on the day-ahead market: the home battery is shown as if its tariff followed that price, which overstates what it would save.
Tesla, Powerwall and Megapack are trademarks of Tesla, Inc. Rigular is not affiliated with Tesla; the specifications are those of its public datasheets.
How it is computed
- Prices: the day-ahead auction of the French bidding zone, published by ENTSO-E, hourly until 30 September 2025 and by the quarter-hour since. The figures run to yesterday and are updated every morning.
- Battery: dispatched exactly on each day knowing the next, from an empty battery on 1 January 2017, the energy left at midnight carried to the next day, and a cycle only when it clears 5 € per MWh discharged.
- Solar: 1 MWp of panels at the best inclination, 14 % of losses, hour by hour from PVGIS (European Commission), each quarter-hour's output sold at its price.
- PVGIS has no weather year after 2023: from 2024 on, the output is the site's average year over 2005–2023.
- The past only: what the market may do next takes a price model, which an account shows on these same assets.