Riverside (Calif.) Public Utilities (RPU) is proposing the Riverside Transmission Reliability Project, which includes a new double-circuit 230-kV transmission line.
The project also includes a new 230/69-kV electrical substation and new 69-kV subtransmission lines, according to the RPU’s website.
The new line would connect the proposed substation, located on RPU-owned land to existing 230-kV transmission lines owned by Edison International (NYSE:EIX) subsidiary Southern California Edison. Six new 69-kV subtransmission lines would also connect the proposed substation to RPU’s electrical system, according to RPU.
RPU General Manager David Wright told TransmissionHub April 4 that the line will be about six miles long, noting that there are several different proposed routes. The route goes halfway through the city of Riverside and halfway through the city of Eastvale, Calif., he said.
The approximately $150m project is expected to be completed in 2015 or 2016, he said.
“We finished the draft [environmental impact review] and it should go to our city council within the next couple of months for final EIR,” Wright said. “Then it has to go to the [California Energy Commission] and the [California Public Utilities Commission] for their approval, so it’s still got several more processes it has to go through of approval before we can move forward.”
As to why the project is needed, RPU noted that all of its imported energy for its customers currently comes through SoCalEd’s Vista substation in the city of Grand Terrace. The capacity for RPU at that substation is limited to 557 MW. That limit was exceeded for the first time during the summer of 2006, but the dropping of customer load was avoided by use of internal generation. However, RPU added, use of internal generation is not a reliable long-term solution to this capacity shortage. A long-term solution is needed to provide enough electrical capacity to meet RPU’s current and projected load growth, RPU said.
The project would also help increase the reliability of RPU’s electrical system, RPU said, adding that it would provide a second point of electricity delivery, reducing dependence on the existing Vista substation, and providing the capacity and reliability needed to support recent and future growth in the area.