Denver Post: Colorado, already viewed as a renewable energy leader, took another step Monday when Gov. Bill Ritter signed into law a bill that will give the state the highest renewable energy standard in the Rocky Mountain West. The measure requires that 30 percent of electricity be generated from renewable sources by 2020. “This is a commitment to clean energy that is unparalleled in the country,” Ritter said. “There is no place in the world that compares to Colorado in research and …