On 0.6.1 there is no way to allow for you to use the Main Power! You can't even start your ship! I don't know what to do. I'm on a mac if that helps at all. I love the newest version, but I keep having to use 0.6.0 instead.
Main power is not a energy source, but a grid, you have to power it up with a strong energy source(turbines(they require plasma)). for starting up the ship use the batteries to power the aux. grid first, but don't discharge them!(last battery button);
