A million volts hummed between the wires. That’s the power of the HVDC Pacific Intertie right here.
This isn’t just any power line. The HVDC Pacific Intertie is a historical marvel. It was the first long-distance high-voltage direct current power line in the United States. Imagine connecting the Pacific Northwest’s hydroelectric power to Los Angeles. That’s exactly what this incredible feat of engineering does. Completed in 1970 it serves millions of homes. It transmits power from the Celilo Converter Station near the Columbia River to the Sylmar Converter Station right here in Los Angeles.
Initially using mercury arc valves the Intertie has undergone significant upgrades. The mercury arc valves were gigantic. Each weighed 14000 pounds and contained almost a liter of mercury. They were replaced over time by more modern thyristor converters. These improvements dramatically increased the Intertie’s capacity.
The Intertie isn’t just about power transmission. It’s a testament to technological innovation. The use of high-voltage direct current is key. DC current penetrates the entire conductor reducing energy loss compared to alternating current. This is particularly advantageous over the long distances covered by the HVDC Pacific Intertie.
The Intertie cleverly addresses regional power demands. In winter the Northwest uses more power for heating. In summer the South uses more power for cooling. The Intertie balances the energy needs between these regions.
The Sylmar Converter Station plays a vital role. Here the high-voltage direct current is converted back to alternating current. It then seamlessly integrates with the Los Angeles power grid. This station has also suffered damage from earthquakes necessitating reconstruction.
The HVDC Pacific Intertie is more than just wires and towers. It’s a story of ingenuity persistence and the constant drive to improve. It’s a vital part of Los Angeles’ infrastructure. It’s a symbol of the power of human innovation and collaboration. This power line literally lights up our lives.