A typical land-based wind turbine has a yield of about 25 to 30%, i.e. it produces about 25 to 30% of its maximum theoretical capacity. A typical offshore turbi

A typical land-based wind turbine has a yield of about 25 to 30%, i.e. it produces about 25 to 30% of its maximum theoretical capacity. A typical offshore turbine produces 45 to 65% of the time (the bigger turbine, the better). So installing 1GW of wind power onshore basically produces about half the actual power as 1GW offshore, off the bat. Similarly yields of other renewables vary considerably (unsurprisingly, 1MW of solar panels produces twice as much power in Spain as in Germany).