Highmark Erectors, Inc. was contracted to perform (2) 230kV power circuit breaker change outs for Black Hills Corporation. Scopes of work included removing and disposing of the existing oil filled breaker, installation of (2) new SF6 gas breakers, misc. conduit and grounding, power & control cable installation and termination, re-installing strain bus jumpers. This work started in the summer of 2020 and was completed by the fall of 2020.