U.S. electric power sector emissions continue to drop to historic levels.

That's according to the U.S. Energy Information Administration (EIA), which found that on a 12-month rolling total basis, power sector carbon dioxide (CO2) emissions have consistently fallen below transportation sector CO2 emissions for the first time since the late 1970s. 

From October 2015 through September 2016, U.S. CO2 emissions from the U.S. power sector were 1,803 million metric tons (MMmt) while transportation sector emissions were slightly higher at reached 1,893 MMmt.

The chart below illustrates monthly energy-related CO2 emissions from both sectors over the past three decades. 

Source: U.S. Energy Information Administration

As the chart shows, power sector emissions have generally been trending lower since 2007, with emissions from the sector dropping to the lowest point on an annual basis since 1993.