In West Oahu, the island’s two main transmission corridors are linked together by transmission lines between power plants and substations. However, no similar connection exists on the eastern side of the island.
The Hawaiian Electric Company Inc. (HECO), based in Oahu, Hawaii serves 95 percent of the state’s 1.2 million residents.
HECO was looking for an answer to address overload and reliability concerns in this region and ensure reliable power supply to its customers.
HECO selected a comprehensive Siemens smart grid solution that automated the high-load distribution circuits feeding sections of East Oahu. The phased smart grid project integrated an intelligent 46 kV substation and sub-transmission infrastructure with the existing control center system. Intelligent substation controllers and automated switches and reclosers enable quick fault isolation and power restoration. This forms the basis of a self-healing grid.
By taking a smart grid approach, HECO modernized its grid cost efficiently instead of investing in a new infrastructure.
Reliability of service could be improved significantly to more than half of HECO’s customers in Oahu and the duration of power outages has been greatly reduced—in many cases from two to four hours down to a few minutes.