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Home battery calculator: backup time, Rénoclimat grant and Flex D

How many hours your battery lasts in an outage, whether it meets the technical conditions of the Rénoclimat grant (up to $4,000 since October 1, 2026), and what it can save on Hydro-Québec’s Flex D rate.

See the spec sheet: some batteries keep a reserve.
Add up the average power of essential appliances (fridge, pump, lighting, backup heater…).
Hydro-Québec counted 20 in winter 2025-2026. Each event lasts 4 hours, up to 120 hours per winter.

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These calculations are estimates for information only, before taxes. Programs, rates and their conditions can change: check them on the Hydro-Québec and Government of Quebec websites before you sign.