Video trailer: https://youtu.be/HV8aBXBBX_w

It's cold at home.

Every couple of hours an Ofenhocker rises out of Aquilo's ocean, drifts round your factory and settles on a warm
heating tower or nuclear reactor.

• It charges up on its seat's heat. Put a lightning collector in reach and the charge cracks into it as a bolt: a
  little more power than heat exchangers would make of the same heat.
• With no collector, the charge just fizzles away.
• It stays as long as its seat is warm, then finds a warmer one or goes home.
• It's harmless. Turrets leave it alone; shoot one and it flees back to the sea.

Requires Space Age.