There was a note tucked behind this photo in the album. It read:

"Temporary installation made for about 2 years - La Porte Rock Crusher. 2 Pole Rack for 50 kW transformer - 13kV"

This might be slightly later than many others in the album if this really is La Porte, CO. Denver Gas & Electric Light merged with Western Light & Power and Colorado Power Company in 1924 to become Public Service Co. of Colorado (which later became Xcel Energy). DG&EL never reached outside Denver, so this might be post-1924 when the systems were combined.