They should be able to put memtest on the boot partition and then break to an EFI shell on boot and Ioad it manually.
There will be a bit of swearing and googling required but it’s doable in a way that doesn’t mess with the current boot arrangement.
Ok so as a indicative figure, my air-conditioned three bedroom home in Australia uses about 20kWh a day in the hottest part of the year, which multiplies out to about 0.6 MWh a month.
I wouldn’t expect the average Chinese home to use more than that, because that’s getting on the higher end of average usage in Australia and our homes are full of energy gobbling gadgets.