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

Energy News Network: As states, cities and towns set goals for 100 percent renewable energy, critics question whether it can actually be done, and done cost-effectively.

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.

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