When the heat goes off — winter grid fragility, calmly
European winters now run on a tighter electricity margin than at any point in the last decade. Three small habits that turn a 24-hour outage from a crisis into an inconvenience.
The new normal
The 2022–2023 winter taught most European grid operators that "spare capacity" is a fiction. ENTSO-E's 2025 winter outlook still flags Germany, France and the Baltic states as operating within a few hundred MW of system stress on the coldest evenings — enough that a single generator trip can mean rolling blackouts.
The good news: this is the kind of risk you can plan for in an afternoon.
Three habits, one weekend
- Pick your warm room now. One internal room, doors closed, blankets on the floor seams. With a household of two adults, body heat alone will keep an insulated 12 m² room above 8°C for ~12 hours, even when the rest of the flat sits near zero. Decide which room before the outage, not during.
- Keep one heat source independent of the grid. A camping gas stove with two cartridges. A wood-burner if you have one. Not for cooking warmth into the room (CO risk) — for boiling water for hot drinks, washing, hot-water bottles. Heat carried close to the skin lasts longer than heated air.
- Fill the bath when the warning comes. Three days of water and a thermal mass that releases overnight. Even cold water in a tub stays well above outside temperature and gives you something to wash with that isn't ice from the tap.
What this is not
This is not about generators, off-grid living, or wood stoves you don't yet have. The household that survives the grid event in good shape is the one that practiced sleeping in their warm room for one night last November — before they needed to.
One thing this week: identify your warm room. Walk into it tonight. Note what's missing.
— Systems Fail Lab