Warren Buffett-owned Iowa utility plans to meet 100% of customers’ power needs from renewable sources by 2021

A new, cleaner power plant that educates as well as keeps the lights one.

Solar and wind energy increasingly are competitive with conventional energy on cost, but their weather-dependent nature undermines confidence in them.

There is a renewed interest in construction of high-voltage direct-current transmission lines as they are viewed as an ideal solution to deliver far away wind and solar energy, and to stabilize intermittent renewable power, concepts backed by a recent report prepared for the Energy Information Administration.