By one measure – and measuring this sort of thing can get pretty complicated – the world’s biggest energy providers got a whole lot greener in 2013.

The publication EI New Energy, in releasing its third annual compilation of the “Top 100 Green Utilities” (PDF), said emissions-free sources accounted for 80 percent of the new energy generating capacity added by large utilities in 2013, a dramatic increase from 30 percent the year before.

The big additions – 21 gigawatts of non-hydropower renewables, 16 GW of hydro, and 3 GW of nuclear power – didn’t jumble the leaderboard much, at least not at the top: the Spanish company Iberdrola heads the new list, as it did in 2013, followed again by Energias de Portugal. The only changes in the