Hawaiian Electric Company is planning two grid-scale energy storage projects to increase the reliability of the Oahu electric grid, accept more renewable generation and further reduce fossil fuel use.
If the projects are approved by the Public Utilities Commission, the company plans to move ahead on the following projects, both using lithium-ion technology:
- A 20-megawatt (MW) system to support the 20-MW West Loch Solar under construction at Joint Base Pearl Harbor-Hickam, West Loch Annex
- A 100-MW system at Hawaiian Electric’s Campbell Industrial Park Generating Station
“These projects will improve resilience and reliability while helping stabilize costs for our customers,” said Ron Cox, Hawaiian Electric senior vice president for operations. “As Hawaiian Electric progresses toward 100 percent renewable energy, these storage projects will reduce our fossil fuel use by enabling more solar and wind integration into the grid.”
Hawaiian Electric plans to own and operate a 20-MW battery capable of storing 80 megawatt- hours of energy at a cost of $43.5 million at the West Loch Naval Annex on land leased from the U.S. Navy for the West Loch solar project.
The company hopes to start construction by October 2019 with the system in service by February 2020. Because storage will be paired with the solar facility, it will be eligible for the Federal Investment Tax Credit that will save customers 30 percent of what the project would cost without the credit, the utility said. The battery will reduce the need for conventional, oil-fired generation during the evening peak and at night, reducing fossil fuel use and lowering carbon emissions.
To take advantage of the maximum Federal ITC to lower costs for customers, Hawaiian Electric is also accepting proposals for new grid-scale renewable generation that includes storage. The companies are seeking the largest amount of variable renewable resources ever developed at one time including 220 MW for Oahu; 60 MW for the island of Maui and 20 MW for Hawaii Island.
Campbell Industrial Park
The 100-MW/100-MWh battery energy storage system to be owned and operated by Hawaiian Electric at its Campbell Industrial Park Generating Station (CIP) will be part of an envisioned group of large-scale energy storage to provide contingency and regulating reserve for the Oahu grid. Hawaiian Electric hopes to start construction in October 2019 with the battery in service by October 2020 at an estimated cost of $104 million.
Using the battery to provide reserves – or backup – in place of running conventional power plants will reduce fuel costs for customers so the project will ultimately pay for itself. The CIP site was selected to minimize costs. This site has no additional land costs, requires minimal site preparation, has existing underground duct lines for the 138-kilovolt connection to an adjacent substation, and a full-time, on-site maintenance staff. Permitting requirements are minimal as it is an industrial area far from residential neighborhoods.