International Battery Substation (IBSS)
Battery storage power plant · Anchorage County, Alaska
Nameplate capacity
40 MW
Rank in Alaska
#18
of 150 plants
In service since
2024
October 2024
Details
- Primary fuel
- Battery storage
- Technology
- Batteries
- Operator
- Chugach Electric Assn Inc
- County
- Anchorage County
- Generating units
- 1
- Share of state capacity
- 1.28%
- Rank among battery storage plants in Alaska
- #2 of 5
- EIA plant code
- 68611
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| IBSS | Batteries | 40 MW | 40 MW | 2024 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Alaska
| Industrial Plant | Other | 42 MW |
| Battery Energy Storage System | Battery storage | 40 MW |
| University of Alaska Fairbanks | Coal | 40 MW |
| Auke Bay | Other | 36 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 40 MW solar plant and a 40 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Alaska power plants · What Alaska actually generates