Nearly 40 years of production have been achieved at The Geysers field in California and at Wairakei, New Zealand, while the Larderello field in Italy has produced geothermal electricity since 1904.
Geothermal plants are modular, and can be installed in power increments to fit needs.
Construction time can be as little as 6 months for plants in the range 0.5 to 10 megawatts and as little as 2 years for clusters of plants totaling 250 megawatts or more.