Xcel Energy has an aggressive clean energy goal. How will it get there?

The utility says its interim goal of 80 percent carbon reduction by 2030 can be met with existing technology. After that, it gets more difficult.In Colorado, Xcel Energy says its recently announced goal of 80 percent reduction in carbon emissions by 2030 can be achieved with existing technology. Costs of renewables have declined, weather forecasts have improved, and engineers have learned how to integrate higher and higher levels of clean power without sacrificing reliability.