Energy Encyclopedia

Electricity · 8 min read · Energy Atlas Editorial

How Electricity Is Generated

Most electricity still comes from spinning generators. Inverters now add solar, wind, and batteries to the mix.

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A thermal plant is a heat engine plus a generator: coal, gas, nuclear, geothermal, CSP, and biomass all raise a working fluid. Hydro and wind are prime movers without a boiler. PV has no turbine at all. Grids must accept whatever mix is connected and still keep frequency near the setpoint.

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Questions

What is the efficiency of different power plants?

Efficiency depends on the conversion physics. Do not use one number for every nuclear, coal, or solar plant.

Why can’t electricity simply be stored everywhere?

Electricity is a flow. Storing it means converting it into another form and back, with losses and cost.

Glossary