Healy Power Plant
Healy Power Plant is composed of two generating units:
- Healy Unit 1:
- Operational since 1967
- Healy Unit 2:
- Began burning coal in 1998, but was placed in warm-layup status until it was purchased from Alaska Industrial Development and Export Authority (AIDEA) in December 2013 and came back online in May 2015
- The plant has been commercially operated since September 2018
- More information on Healy Unit 2 can be found here.
Coal Ash Handling Systems:
- Healy Unit 1: The former coal ash handling system, constructed in the 1990s, consisted of a primary settling pond (Ash Pond), a Recirculating Pond, an Emergency Overflow Pond, and an Ash Drying Area (defined as a CCR landfill by the CCR Rule). All three ponds were incised with storage volume less than 20 acre-feet and height less than 20 feet. Coal ash from the Ash Pond was placed in the Ash Drying Area where excess water drained and evaporated prior to transport and disposal at Usibelli Coal Mine (UCM). The ash settling ponds and the Ash Drying Area make up the four CCR units regulated under the CCR Rule. After closure of Unit 1’s coal ash settling ponds in 2021, coal ash generated by Unit 1 is directed to Unit 2’s mechanical drag conveyor systems. Combined coal ash from the two units is conveyed to silos for intermediate storage prior to offloading for transport and final disposal at UCM.
- Healy Unit 2: A dry handling process and mechanical drag conveyor system is used to manage the generated coal ash. Unit 2’s coal ash is intermediately stored in silos prior to transport and disposal at the UCM.