The scope of electricity generation cost is astounding! On average it costs 5 times more to generate electricity from solar thermal power than geothermal power.
Specifically, the data we see plotted above is the levelized cost of electricity (LCOE) – a static that estimates the cost of building and operating a generating plant for a period of time (here it is 30 years). LCOE includes capital costs, fuel costs, operations & maintenance, financing costs, etc.
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