Renewable energy is winning again. The Power Sector Carbon Index just revealed that carbon dioxide (CO2) emissions intensity is the lowest on record. Thanks to government policy, market forces and new technologies, energy companies have moved away from carbon-intensive coal and towards cleaner, greener energy like renewables and natural gas. And the numbers aren’t insignificant – 13 years ago, carbon intensity was nearly 27% higher than it is now.

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Carbon emissions intensity is the rate of emissions produced relative to the amount of energy that we get from it. Carnegie Mellon University (CMU) and Mitsubishi Hitachi Power Systems (MHPS) released their 2018 Carnegie Mellon Power Sector Carbon Index — which tracks power producers’ environmental performance in the United States, and compares today’s emissions to over 20 years of historical data.

Assistant professor Costa Samaras said in a statement, “The Carnegie Mellon Power Sector Carbon Index provides a snapshot of critical data regarding energy production and environmental performance. We’ve found this index to provide significant insight into trends in power generation and emissions. In particular, the data have shown that emissions intensity has fallen to the lowest level on record, as a combination of natural gas and renewable power have displaced more carbon-intensive coal-fired power generation.”

Related: 104% of Portugal’s electricity consumption in March came from renewable energy

Specifically, emissions of power plants in America averaged 967 pounds of CO2 per megawatt-hour (MWh) last year. That figure is 3.1 percent lower than 2016, and 26.8 percent lower than in 2005, “often used as a benchmark year for measuring progress made in reducing emissions,” according to the university.

The 2017 fourth quarter (Q4) update from the university, also posted in early April, offers more insight into how renewables are playing a role. In Q4, power plant emissions actually averaged 952 pounds of CO2 per MWh. And compared against 2016 Q4, in 2017 Q4 coal generation dropped six percent, natural gas was up four percent, nuclear up four percent, hydro up one percent, wind up 13 percent, and solar up 30 percent.

MHPS Americas CEO Paul Browning said, “The power industry has made significant progress in reducing emissions for over a decade, as new technology, state and federal policies and market forces have increased power generation from natural gas and renewables, and decreased power generation from coal.”

+ Power Sector Carbon Index

+ Carnegie Mellon University College of Engineering

+ Power Sector Carbon Index — 2017 Q4 Update

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