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A feed-in tariff is a policy that supports the growth of renewable energy. It determines the prices per kilowatt hour of a system over its lifetime, plus a return on investment.
Gross energy includes energy consumption within the energy sector along with distribution losses; final energy is the energy that reaches your doorstep as fuel or electricity. In other words, losses in production and transport are not included.
To complement renewables, we will need power plants that can change how much energy they produce relatively quickly. To pay for such reserve generating capacity, the power market will need to be redesigned.