Power (Civ2)

Power is a synergy bonus applied to city production in Civilization II. A city featuring a Factory and/or Manufacturing Plant accrues an additional 50% bonus to Shield yield when a power plant is also present, or the civilization controls the Hoover Dam.

The 50% power bonus is calculated based on the city's base Shield yield; the extra Shields created by the Factory and the Mfg. Plant do not get the 50% power bonus. The formula is:

$\lfloor s_{0}\times {\frac {f+m}{2}}\rfloor +\lfloor s_{0}\times {\frac {p}{2}}\rfloor =s_{1}$

where s₀ is the city's Shield yield; f, m and p each equal 1 when a Factory, Mfg. Plant, and/or power plant are present, respectively; and s₁ is the final bonus Shield output.

The bonus applies as long as a Factory or Mfg. Plant is present in the city; a city possessing a power plant alone accrues no bonus.

Power plants

Power plants are a type of city improvement. There are four possible plants; each confers the same bonus, but differs in prerequisite advance, build and maintenance costs, and pollution mitigation. Although multiple plants can be constructed, the synergy bonus only applies once: older plants must be manually sold to avoid superfluous upkeep.

Name	Prerequisite	Build cost	Upkeep	Pollution mitigation	Priority	Additional notes
Power Plant	Refining	160	4	1	4
Hydro Plant	Electronics	240	4	2	2	Requires city on or next to River or Mountain. Provided to all cities by  Hoover Dam
Nuclear Plant	Nuclear Power	160	2	2	3	Risk of destructive meltdown without Fusion Power
Solar Plant	Environmentalism	320	4	9999	1	Also mitigates pollution from population

See also

• Power in other games