Description
Even in endgame, I still like to mess around with steam plants for local power generation.
This design merges heating towers with nuclear reactors while still taking advantage of the latter's neighbor bonus. Heating Towers also act as great heat pipes due to their larger size.

To be fair, none of my bases produce millions in SPM (at most, 15K) and are largely belt-bases, not requiring really high power draw. The following power plant designs follow in the roots of tile-able 2-by-X Nuclear Reactors while incorporating Heating Towers, generating gigawatts from local resources and having backups when needed.
This blueprint book contains both fuel plant designs and some of the respective fuel factories.