Ultra-cheap energy

Some countries charge a household a very low price per joule for up to a specified low rate of energy use, and a higher price per joule for additional energy beyond that necessary minimum. That eliminates the danger of shut-offs for the poor, and assures that high fuel costs won't crush them.

Note that a kilowatt hour equals 3.6 mega joules. Any kind of energy can be measured in either of these units, and any system for delivering energy could be covered by a charging system like this one.