Energy and its use are like money. We need to account for it by defining essential requirements -such as life support systems, and security and non-essential requirements - and then contain them and continually review them. Power is 'managed energy, differential potential' - a change in state. Energy is wasted, but it can be harvested from the process. When required, this captured energy can be released to deliver power on demand in the form of heat, cooling, pressure, mechanical torque or electrical power.
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