A second fluid lets geothermal plants run on cooler water
A binary-cycle geothermal plant hands hot water's heat to a fluid with a low boiling point. Its vapour spins the turbine, so cooler reservoirs make power.
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Westinghouse underbid GE, and alternating current won
Westinghouse bid $399,000 against General Electric's $554,000 to light the 1893 Chicago fair, and the win helped settle the AC-DC rivalry.
A pumped-hydro plant stores height, not water
A pumped-hydro plant stores energy as water lifted to a high reservoir, then lets it fall through turbines to give the power back when demand peaks.
A tripped power line can black out a grid in seconds
Every generator on a grid must stay locked to one frequency. That is why one lost line can drag others down, as 33 lines did in the 2006 European blackout.
The UK's £400 energy bill grant cost £12bn and has closed
The UK's Energy Bills Support Scheme began as a £200 loan and became a £400 grant costing £12bn. It closed along with the seven other energy support schemes.