So the good news is that you would be able to boil that kettle in the evening... the bad news is that you couldn't get to work in the morning? <br><br>I like the idea of a colossal flywheel.  A huge diameter that can be spun slowly (for increased efficiency), that just so happens to be slow enough for people to ride like a ferris wheel.  For additional cheek, make sure that the entry is higher than the exit, thereby robbing tourists of their hard earned potential energy (muha, muha, muhahahahaa).<br><br>More sensibly, what's the argument against more massive wind turbines?  In a similar vein, we have thousands of them, if they were all a bit heavier that would smooth out the power delivery too surely?