Efficient Energy Use--wait, let's be efficient and call it EEU--is a great way to save money. And it's an old way: "Give me a lever long enough and I will move the world" said some ancient Greek dude.
Sure, energy--by itself--can move mountains. That's what's known as "volcanoes." EEU can move mountains too. And that's known as progress.
We've got all sorts of ideas here for EEU (Efficient Energy Use, remember?) Each idea will save you money. Put them all together and they'll save you a lot of money!