The PR Electric Power Authority awarded this project to ABB, a major electrical equipment vendor, in September 2005. Because of site limitations, it was necessary for it to be done in 2 phases. Phase 1 involved a 1,665-sf building, which had to be operational to permit the demolition of a 38kV switchyard so that phase 2 could begin. A high bay main level of 8,706 sf was constructed in this second phase, with a 7,132-sf basement space. The building includes an overhead traveling crane for maintenance purposes. Adjacent to the first phase building, a diked area was constructed for two 100 mVA 115/38 kV transformers. Site works primarily included foundations for the gas insulated bus duct supports which connect the building’s electrical equipment to the power plant’s main transformers, and for the H frame structures which intercept the four 115kV overhead lines. The Palo Seco plant has a generating capacity of 744 MW.