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A power plant giving least running cost of production of electrical power is

The hydroelectric power plant has the lowest running cost because it does not need any fuel and can be operated by few persons.

It is cheaper as compared to electricity generated from coal and gas-fired plants. Nuclear gas and thermal power plant require fuels also the handling cost of fuels is added with the total cost.

It also reduces the financial losses due to frequency fluctuations and it is more reliable as it is inflation-free due to not usage of fossil fuel.

Converting over 90% of available energy into electricity, hydropower is the most efficient source of electrical energy. By comparison, the best fossil fuel power plants operate at approximately 60% efficiency.