Portugal’s renewable electricity production (mostly from hydropower and wind energy) exceeded monthly consumption in March. The average renewable generation for the month exceeded 103.6 percent of consumption. According to the nation’s transmission system operator, renewable energy production reached 4,812 gigawatt hours, surpassing Portugal’s total electricity needs for March, which totalled 4,647 gigawatt hours. But that does not mean that Portugal’s electric system can rely solely on renewable energy. At least, some say, not until 2040—over 20 years from now—will that be able to happen in a cost effective way.