The Colorado Public Utilities Commission has raised the energy-efficiency bar for Xcel Energy Inc. even as Colorado's biggest power utility sought to hold it steady. Under a 2007 state law, investor-owned utilities, like Minneapolis-based Xcel, have to implement programs to cut the demand for electricity-known as "demand-side management" or DSM- in return for financial incentives. In setting the targets for the next five years, Xcel's subsidiary, Public Service Company of Colorado, had sought a goal of 400 gigawatt-hours of electricity reductions, the same as the last five years.