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The first steam turbine used in an American electrical power plant was a Westinghouse reaction turbine of the Parson's type installed at the Hartford, Connecticut, Electric Light Company in 1902.

The turbine inlet state was 200. psig and 400.°F, the generator produced 2.00 MW, and the plant had a heat rate of 35.0 × 10³ Btu/(kW · h). Determine its thermal efficiency.

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