Ezmerelda wanted to build a pizza joint next, but there wasn't enough electricity to supply it. You buy up that land way out west of Dryville and build Horace's Nuclear Power Plant. The equipment in nuclear plant gets hot, so again you need a lot of water. You again cool the used water by putting it through tremendous cooling towers that look like huge, round chimneys.
Hot water is sprayed inside the tower and is cooled by the surrounding air.
The joke around the plant is that it is a great way to let off steam. Finally, you realize your Dryville has grown up. You make a decision to leave Dryville and find some nice desolate spot to start building a new town.