Ken Bossong notices an interesting bit embedded in the latest monthly report from the Energy Information Administration (EIA). In 2011, for the first time in decades, the United States got more of its energy from renewable sources than it did from nuclear power. Not only that, but renewables are growing much faster than any other energy source.

Our changing energy world over time, based on percentage of electricity generation. (EIA)

Going forward, however, that could well shift. The nuclear industry is more focused on replacing soon-to-retire plants than expanding outright. There aren’t likely to be too many more large-scale hydropower plants in the United States — the prime hydro sites have all been taken. And as for biomass and biofuel, critics have raised serious questions about whether either of these sources are as sustainable as alleged. On the other hand, solar and wind were by far the fastest-growing energy sources last year — solar electricity grew 46.5 percent and wind by 27.1 percent (though it’s unclear whether either source can maintain that hectic pace now that Congress has allowed a few key subsidies to expire.)

Of course, there’s more than renewables. The other big story in EIA’s data is that natural gas has been rising fast as an electricity source — growing 1.6 percent in the past year — while coal use has been falling noticeably (4.2 percent). That’s likely to continue in the years ahead, as the EPA’s new pollution rules push utilities to shutter aging coal plants and cheap shale gas floods the market. Indeed, that’s one reason why, as Steven Hayward points out, U.S. coal exports have been surging in the past few years. If we can’t burn the stuff here, then we can always ship it abroad, particularly to Europe and (as it happens) South Korea.