LAS VEGAS — President Barack Obama brought presidential star power to tout the benefits of solar and wind electricity in the U.S. during an annual green power conference Monday in Las Vegas.

The president used a keynote speech to the eighth National Clean Energy Summit to endorse continuing development of commercial and home solar energy.

He also called for overcoming resistance from what he called fossil-fuel interests trying to protect the status quo.

Earlier, the costs and benefits of rooftop solar electricity in Western states was a key topic of the conference hosted by U.S. Sen. Harry Reid.

The question hits home in Nevada, where the dominant utility, NV Energy, last week hit a preset statewide cap of 235 megawatts on the amount of rooftop solar power it will buy back from customers.