If you're feeling a little flush this Christmas why not treat yourself to a special present...
Yes, the energy windmill will give you unlimited free energy for a week! At first it costs 175 Horseshoes and shows as charged when the bolt glows blue and the door is lit...
Then, when it's out of charge (after one week) Jack will pop up and let you recharge the Mill for 125 HS, giving you another full week of free energy!