Altitude (Basic)
From Alpha Centauri Wiki
The Altitude of a region affects the amount of Energy which can be collected there from a Solar Collector. Areas below 1000m above sea level produce 1 unit of energy. From 1000m to 1999m"," areas produce 2 energy; 2000m-2999m areas produce 3 energy"," and areas more than 3000m above sea level produce 4 energy.
Ocean squares do not normally produce energy unless you build a Tidal Harnesses"," in which case they produce 3.
See also Altitude (Advanced).
