The long-term sustainability of geothermal energy has been demonstrated at the Lardarello field in Italy since 1913, at the Wairakei field in New Zealand since 1958, and at The Geysers field in California since 1960.
Keberlanjutan jangka panjang energi panas bumi telah dibuktikan di ladang Lardarello di Italia sejak 1913, di ladang Wairakei di Selandia Baru sejak 1958, dan di ladang The Geysers di Kalifornia sejak 1960.