Associated Press: A sun-powered generating station in southern Colorado’s San Luis Valley will finish this year as the nation’s most productive utility-scale solar electricity plant. The 8.22-megawatt SunEdison plant, with its photovoltaic arrays on 82 acres, produced enough power for 1,652 homes, making it the largest plant of its kind in the country. But the Alamosa plant might not be the biggest for long. Construction was recently completed on a 10-megawatt photovoltaic plant in southern …