Minneapolis-based Xcel Energy Inc. said its Colorado utility’s alternative energy plan should provide customers with an estimated 85% reduction in carbon dioxide (CO2) emissions by 2030 from 2005 levels, which is more reductions than required by state law.

Under the plan, Xcel’s 1.4 million customers in Colorado would see renewable energy and battery storage options double. Renewable resources would comprise roughly 80% of the state’s electricity resources.

Xcel’s Clean Energy Plan is scheduled to go before the Colorado Public Utilities Commission in late March.

Xcel,which provides electricity to almost 3.5 million customers in Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin, said it became the first utility in the United...