Solar farms planted on an abandoned nuclear plant site or powering a coal museum or atop a strip mine offer stark images of the ascendance of renewables. But forget metaphorical images — utility-scale renewable electricity generation in March and April actually surpassed nuclear for the first time since July 1984. (Ronald Reagan was president, and “When Doves Cry” was the No. 1 hit on the radio.)Recent months have seen record generation from wind and solar, as well as increases in hydroelectric power because of 2017’s wet winter (note that these numbers, from the Energy Information Administration, do not include distributed solar). Most of the time, conventional hydroelectric generation is still the primary source of renewable electricity.