
Dive Brief:
- Prevalon Energy has brought online a four-hour, 80-MW battery storage project that will be owned by Idaho Power, the companies said Tuesday.
- Prevelon, a joint venture between Mitsubishi Power Americas and EES, in January said it signed a contract to build Idaho Power an additional 200-MW/800-MWh battery storage project.
- The project at the Happy Valley substation in Nampa, Idaho, started operating as Idaho Power has been lining up battery storage projects to help meet potential near-term capacity shortfalls and to prepare for a planned shift to 100% clean power by 2045.
Dive Insight:
Idaho Power has contracts to buy battery storage projects totaling 330 MW and it has entered into power purchase agreements to buy the output from storage facilities totaling 250 MW over 20 years, Idacorp, the utility’s parent company, said in a May 30 U.S. Securities and Exchange Commission report.
The Boise, Idaho-based utility owns about 230 MW of energy storage and has about 5,100 MW of generation on its system, including non-utility resources, according to a June investor presentation.
Idaho Power could add 705 MW of 4-hour storage between 2026 and 2030, according to a summary of its draft integrated resource plan that was presented to a stakeholder group last month. The draft IRP also calls for adding 745 MW of solar and 700 MW of wind by the end of this decade as the utility converts its remaining 480 MW of coal-fired generation to gas. Idaho Power expects to file the IRP with utility regulators in Idaho and Oregon by the end of this month.
The Idaho Public Utilities Commission in November approved a 150-MW, 20-year energy storage agreement under which Idaho Power will buy the output from the roughly $323 million Kuna project, which is owned by Aypa Power.
Meanwhile, Idaho PUC staff is giving mixed recommendations on Idaho Power’s request for a certificate of public convenience and necessity to add two 50-MW storage projects to its portfolio.
PUC staff recommended that the commission approve adding 50 MW to an existing 116-MW battery storage project at Idaho Power’s Hemingway substation near Melba, Idaho, according to testimony filed on June 11 at the PUC. The project is cost effective and will help meet a 2026 capacity shortfall, staff said.
However, staff urged the PUC to reject a proposed 50-MW expansion of Idaho Power’s 150-MW Boise Bench project, partly due to cost risks related to import tariffs imposed by the Trump administration. The utility self-build project would use batteries made in China, which was subject to a 145% tariff put in place in April, according to PUC staff. The tariff was reduced to 30% from May 14 to Aug. 12.
“As this is an evolving situation, there is a substantial financial risk to ratepayers due to the uncertainty of the resource cost,” staff said.
Further, based on Idaho Power’s latest estimates, it appears the utility would have a capacity surplus through next year without the project, staff said.
The action in Idaho comes as more than 2 GW of energy storage was brought online in the first quarter this year, making it the highest amount of additions ever in the period, according to a report released Wednesday by Wood Mackenzie and the American Clean Power Association. Developers brought online about 1.5 GW of utility-scale storage in the quarter, a 57% jump from a year ago, WoodMac and ACP said.