Coal plant closures in the Northwest and an increase in natural gas generation meant fewer heat-trapping carbon dioxide emissions recently contributed to climate change, according to new data from the Northwest Power and Conservation Council.
In total, carbon dioxide emissions from the generation of electricity dropped about 20% in 2020 as compared to 2019, said Gillian Charles, senior policy analyst with the Council.
The data accounts for heat-trapping carbon dioxide emissions released as facilities generate power, including coal, natural gas, hydropower, wind, and solar generation. The data counts greenhouse gas emissions from 2020, which is the most recent year available.
鈥淭hat鈥檚 the lowest carbon dioxide emissions in 25 years,鈥� Charles said.
Heat-trapping greenhouse gas emissions, such as those generated by coal plants, are warming the planet, scientists said. A from NASA concluded 2021 was the sixth warmest year on record, tied with 2018. The past eight years combined for the warmest since record keeping began in 1880, according to the report.
In the Northwest, states have set renewable energy goals to eventually use carbon-neutral energy sources. Thus, retiring coal plants and reducing natural gas generation.
Right now, at least 50% of the region鈥檚 power supply comes from hydropower, Charles said, which means the Northwest emits much less carbon dioxide overall than the rest of the U.S.
According to the most recent council data, renewable energy such as wind power contributed to fewer greenhouse gas emissions in the Northwest. In addition to fewer emissions, renewable energy advocates said a growing list of renewable energy projects in the Northwest could help lower energy bills across the region.
The biggest decreases in emissions in the Northwest will come over the next few years as coal plants retire, Charles said.
However, the region won鈥檛 be able to simply subtract coal plant emissions as the plants go offline, Charles said. It all depends on what type of energy replaces the coal plants, she said.
鈥淎re we relying more on our natural gas, which will then contribute to our emissions? Maybe not as potent, but natural gas still contributes to emissions,鈥� Charles said.
Now, natural gas helps fill in the gaps when slow water flows cause less hydropower generation, she said.
Preliminary data from 2021 shows a slight decline in heat-trapping emissions, Charles said. Several coal plant retirements happened near the end of 2020.
鈥淲e haven鈥檛 really seen the full effects of those retirements on the emissions and the power supply,鈥� Charles said.
In addition, the Northwest is expecting significant renewable energy development over the next 20 years, Charles said, spurred in part by clean energy policies in Washington and Oregon, which will help decrease heat-trapping emissions.
An increase in renewable energy development is starting right now, said Fred Heutte, senior policy associate with the renewable energy advocacy group NW Energy Coalition. More renewable energy projects than natural gas development appear to be in the works, he said.
鈥淲e鈥檙e not seeing a lot of interest in new gas power plants at least for the rest of this decade,鈥� Heutte said.
In addition to what Heutte called an enormous wave of renewable energy projects, he said he鈥檚 seeing an increase in battery storage and smart technology that helps customers use energy when it鈥檚 not in peak demand.
An increase in renewable energy development could help lower energy bills, Heutte said. Once renewable energy facilities are built, you don鈥檛 have to pay for other fuel prices, he said, noting that natural gas prices have risen over the last few months.
鈥淚f you know what your energy costs are going to be 鈥� because you don鈥檛 have the fuel cost going forward 鈥� that really helps stabilize the bills you pay your utility,鈥� Heutte said.