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So if a wind turbine has a capacity of 10MW, what does that exactly mean? does it produce 10MW every hour, or is it the peak power it can generate at any time?

the following question is how to know how much MWh does it produce in a certain time-frame (lets say 24hrs)?

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  • \$\begingroup\$ Peak generation at some given wind speed. E=P*t. \$\endgroup\$ – winny May 5 '18 at 13:38
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    \$\begingroup\$ watts have no time factor, it's just volts times amps, so if constant, in 24h you expect 240Mwh. \$\endgroup\$ – dandavis May 5 '18 at 13:38
  • \$\begingroup\$ @dandavis as long as the wind blows... \$\endgroup\$ – Solar Mike May 5 '18 at 13:43
  • \$\begingroup\$ That beast produces 10,000,000 joules a second, which is the energy output of 10 sticks of dynamite. It can kill you. \$\endgroup\$ – analogsystemsrf May 6 '18 at 2:52
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A 10 MW wind turbine can be expected to output 10 MW (power) at the rated wind speed. If the wind remained at that speed for one hour then the output would be 10 MWh (energy). Over 24 hours that would total 240 MWh. At, say, 5 c/kWh that would be worth €12k.

I can't find a figure but I suspect that, on average, the output will be about one third of the rated output due to calm days, etc.

Have a look at the Wind chapter of David McKay's excellent Sustainable Energy Without the Hot Air which is available in book form or free PDF or HTML form. It provides figures relevant to Britain but the principles apply anywhere.

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    \$\begingroup\$ the capacity rating is a peak output before a safety shutdown, the output depends on two unknowns: the efficiency of the turbine (relates mainly to the magnets and blade size) and the location's climate: high avg wind speed and low anomaly (yielding times when winds are to high/low to be usable). There's map generators for the US, perhaps other nations offer the same thing? \$\endgroup\$ – dandavis May 5 '18 at 15:46

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