I think the closest to free energy perpetual motion is making use of energy in a system so large that there's no noticeable depletion. Solar, wind, hydro, are some examples.

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Those things can only be harnessed by extremely expensive and inefficient machines such as solar panels and windmills, and even when they do work, they do not provide power all the time. Solar panels only work during the day; windmills only work when it's windy.

The closest thing to a perpetual motion machine is substances that contain vast amounts of energy that exist in unimaginable abundance in the earth, such as petroleum, coal, natural gas, and radioactive metals. These are the best sources of energy, which is why the Left wants to take them away from us.

Those things were put in the earth by God, Who foresaw that one day the human race would become so large that traditional means of energy such as horses and oxen and sails and slaves would not be sufficient to produce the food, housing and other necessities of the human race. So, He put these incredibly potent substances in the earth in vast amounts, far greater than anyone has any knowledge of, knowing that one day people would discover their uses and how to harness them, and that this would coincide with humanity's need of such materials.

It is the enemy of mankind who wants to take these things away from us, knowing how good and necessary they are.

The idea that we are going to deplete petroleum reserves soon is a myth by the left. It is a docuмented fact that oil wells that had been thought to have run dry have been replenished by more petroleum from deeper within the earth. So, any estimates about the amount of oil available (laughable as they are) are only based on what is currently guessed to be in the oil wells currently known. But there is certainly more petroleum deeper within the earth's crust that seeps into oil wells, and the amount of that petroleum is obviously completely beyond anyone's ability to hazard the slightest guess.

Are trees considered solar energy? Solar energy allows trees to convert air and some minerals into solid fuel, which can be used for heat, or powering a turbine or engine that produces electricity. 

Wrong, Mr Yeti. I heat my house with it, some European countries burn trees instead of coal or gas, and I think there's still a few old saw mills in the USA running on wood scrap fired steam engines.

I think wood and solar energy could be harnessed in many more ways than people think.

Oh! I forgot our slow combustion stove which also heated our water.

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I was very surprised to learn this. Yes, I did a search and apparently there are power plants in Europe that burn huge piles of wood chips to produce energy. I would have thought this was extremely inefficient. I guess you learn something new every day.

Maybe they have a lot of leftover wood from various lumber mills.  Around here they tend to turn it into mulch, but maybe mulch isn't as much of a thing over there.

I don't know if it was mentioned already, but I had learned something about Nikola Tesla having come up with having continuous electricity in a building I thought.