Construction of a 230 kV substation expansion including a 230 kV gas circuit breaker, a 230 kV disconnect switch, seven control panels, and construction of a new 345 kV substation. The new substation utilizes a 345/230/13.8 kV, 600 MVA transformer, one 55 MVAR bus reactor, two 345 kV gas circuit breakers, six 345 kV disconnect switches, and a control building with seven control panels. Crews constructed foundations, steel structures, above and below grade raceway and grounding, bus, control cable terminations, drilling and pouring foundations, final grading, and setting gravel.