TWO geothermal power facilities of First Gen-owned Energy Development Corporation (EDC) have surpassed the expected 25-year life span of geothermal systems and remain in operation for 40 years now, supplying clean, renewable, and reliable energy to Luzon and Visayas since 1983. The 112.5-megawatt (MW) Palinpinon geothermal power plant in Valencia,…