SMUD is proposing to construct and operate a new 230-115-69 kilovolt (kV) substation that would replace the existing Elverta Substation located south of Elverta Road and just west of El Rio Avenue in Elverta, California. The El Rio Substation is proposed to be constructed on a portion of the existing Elverta Substation as well as on the 4.4-acre property immediately east of the Elverta Substation. The proposed El Rio substation would include new transformers and circuit breakers, a substation control building, paved access, fencing, lighting, stormwater drainage and utilities. North of the substation, two existing electrical towers carrying 230- kV transmission lines would be replaced with two or three steel monopoles (also known as steel tubular poles) on a new alignment to tie the proposed substation into the existing grid. A stormwater retention basin would be constructed south of the existing Elverta Substation. Following the energization of the proposed El Rio Substation, the existing Elverta Substation would be decommissioned and outdated substation equipment dismantled and removed from the site.