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Chapter 18:Risk Assessment <br /> 18.1.11 Energy Systems <br /> 18.1.11.1 Electrical/Feel <br /> The Hawaii Electric Light Company, Inc. (HELCO) operates the electrical system on this is- <br /> land. The electrical system consists of power generating plants, substations, and transmission <br /> lines (see Figure 18-14). HELCO power plants are located at Keahole,North Kona, Waimea, <br /> South Kohala, Waiakea Peninsula and Kanoclehua, South Hilo, and Keaau, Puna. Generating <br /> plants rely on petroleum to produce 75% of the power, with the balance generated from <br /> renewable sources such as geothermal, hydroelectric, and wind. Should the supply of <br /> petroleum become a problem, HELCO has fuel storage to generate power from oil for an <br /> average 30 days, per a PUC requirement. The fuel tanks are at the Hilo base and located out <br /> of flood,tsunami, and lava hazard zones. All major transmission lines are overhead. <br /> 18-31 Hawaii County Multi-Hazard Mitigation Plan <br />