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According to the description, Thermal generators must be built "over steam vents". Naturally, I assumed that this meant the space above the one marked "steam", so I cleared out rubble and tried to build on that space, only to find that I could not.

Do I need to actually build on the space that says "Steam", or above it as the description says? If above it, is there any reason I can't build on a space I've cleared out? (other than money, which was not an issue).

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up vote 10 down vote accepted

You can only build thermal generators on squares in your base view that have "Steam" in them. This is a bit confusing in the tooltip, but that's the way it's implemented.

There's no reason to avoid building on an adjacent square - there's nothing unusual about the space above a "Steam" square. However, there is an adjacency bonus for power plants. Therefore, you might want to consider building another power plant type there, in order to get the bonus power.

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