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In 2021, the Black Mountain Power Plant in Nevada generated 723,457 MWh in electricity from combusting natural gas that contained a total of 5,343,091,000,000

In 2021, the Black Mountain Power Plant in Nevada generated 723,457 MWh in electricity from combusting natural gas that contained a total of 5,343,091,000,000 Btu in energy. What was the efficiency of the power plant that year? Answer in decimal form with 3 significant figures. [Helpful conversions: 1 MWh 1000 kWh 1 million Watt-hours; 1 Watt-hour 3.41214 Btu] =

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