The museum is free, although you need to take a token from the shop. The site is significant for renewable energy fans, according to the tour guide they produce 2% of Italy's electricity here from steam they drill down to find. The museum is neat and tidy and shows some artifacts and lots of models. Captions are in Italian and English. There are also few video displays. I was hoping for more details on the current structure of the industrial site but didn't find it. For a very small fee, one can drive, behind the guides' car, up to a disused well just outside Larderello and watch the guide open the valve and release steam at 4 bar. It is so noisy you have to stand at 50m distance with ear muffs.
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