Question: how much does tidal power cost a year?
Answer: The cost per kilowatt hour (kwh) of the plant is worked out by multiplying the construction cost and the capacity. As such, it has been estimated that Sihwa cost $117 per kwh, while it produces electricity at $0.02 per kwh. It is formed of 10 generators, which produce a total energy capacity of over 550GWh annually.