No, they don’t.
The reason is stability.
1. Building a power plant on/into a mountain peak is prohibitively expensive.
2. If the volcano is an active volcano(meaning it may erupt in the near future) then building a permanent structure that will need to be operated and maintain by people is dangerous both for the equipment and the people.
3. If the volcano is inactive then there isn’t *that much* extra thermal energy laying around.
4. Thermal energy plants are more safely and more efficiently set up by simply drilling straight down from a convenient location. You can run a pipe(over simplifying) down into the mantel through a small bore hole and get consistent levels of energy without the risk of eruptions.
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