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Heatwave outages: planning one cool room that keeps going

Heatwaves strain the grid at the same time they make cooling a health issue. An outage at four in the afternoon in a heatwave is a different problem from one on a mild night.

Why the grid struggles in the heat

In a heatwave every air conditioner in the region runs at once, lines sag in the heat, and transformers run hot. Networks can be pushed into load shedding or faults at peak demand in the late afternoon. Older people, babies and anyone with a heart condition are at real risk without cooling, so for many households a heatwave plan is a health plan, not a comfort one.

What it would keep running

  • Heat pump cooling one shaded room
  • Fridge holding insulin or other medicines
  • Ceiling and pedestal fans
  • Freezer with ice packs
  • Modem for heat health alerts

The cool room approach

Choose one room, ideally on the shaded side of the house with good curtains, and plan to keep that room cool on backup. A heat pump in cooling mode fits easily within 15 kW alongside the fridge and freezer. Close it off from the rest of the house, draw the curtains before the sun hits, and run the cooling steadily rather than blasting it from hot.

Pre-cool the house on grid power in the morning while supply is steady, so stored energy only has to cover the hottest hours rather than pulling a hot house down from scratch. Keep the doors to the cool room shut and bring everyone into it during the late afternoon peak.

How it works →
The H2OME loop: an electrolyser splits water into hydrogen, the hydrogen is stored in a tank for weeks, a fuel cell turns it into electricity for your home, and the water returns to the loop.

Honest numbers on stored energy

Cooling for hours is a sustained load, and stored hydrogen is not a bottomless supply. Round-trip efficiency is 30% or less, so every kilowatt hour of cooling cost roughly three or more kilowatt hours of night-rate power to store. That is fine for an emergency and worth it when someone vulnerable lives with you. It is not a cheaper way to run air conditioning every summer afternoon.

Questions

Will it run ducted air conditioning?

A small ducted system may fit within 15 kW, a large one cooling the whole house may not leave headroom for anything else. Check the rated input on the outdoor unit. Most people get better results cooling one room than trying to cool everything.

Does heat affect the equipment?

Batteries and electronics prefer shade and airflow, so the enclosure should be sited out of the afternoon sun with ventilation kept clear. How the system performs through sustained high temperatures is part of what pilot homes will show.

Someone at home depends on cooling for health. Is this enough?

Keep any medically dependent registration you hold with your power company and talk to your clinician about a heatwave plan. Backup power can help, but it does not replace a medical plan or a hospital-grade supply.

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