# Confusion between MW and MWh

A 1MW power plant producing power constantly for 24 hours will produce 24 MWh a day. Is that right?

If it is, I don't understand when it says, in http://www.beaconpower.com/files/Flywheel_FR-Fact-Sheet.pdf, that the 20MW energy storage plant can release 25kWh at 100kW for 5 minutes.

What does that mean? I don't get why they refer the plant as having 20MW, when all it can do is release 25kWh at 100kW for 5 minutes. Also isn't 25kWh over 5 minutes at a rate of 300kW?

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Fisrt take a look at this sentence:A 20 MW energy storage plant consists of 200 such flywheels. So 20*100 kW=2 MW Next take a look at the calculation itself. The device can deliver 25 kWh of energy and can deliver 100 kW for 15 minutes. 60/15=4, so 100 kW* 1h/4=25 kWh. Everything looks fine to me. –  AndrejaKo Dec 27 '12 at 7:21
Ahh... I don't know why I read it as "5 minutes"... Thanks for clearing it up! –  Eric Dec 27 '12 at 7:23