Gas-fired power plants are a significant source of carbon pollution in the US power sector, according to data from the Energy Information Administration. These plants pose various problems for communities, and the proposal of new gas power plants only adds to these concerns.
Developers of gas plants are considering the use of hydrogen as a way to reduce carbon emissions and stay relevant in a transitioning economy. However, the effectiveness of this approach compared to using renewable energy sources needs to be carefully examined. Research from the Union of Concerned Scientists (UCS) delves into the complexities of hydrogen cofiring and its implications.
When burning hydrogen in a gas plant, there is a reduction in carbon emissions from the smokestack. However, the energy content of hydrogen is lower than methane, leading to the need to burn more of the gas-hydrogen blend to generate the same amount of electricity. This results in a nonlinear relationship between the percentage of hydrogen blended and the reduction in carbon emissions.
The production of hydrogen, especially through steam methane reforming (SMR), can be carbon-intensive, emitting CO2 and other greenhouse gases. The carbon emissions from producing hydrogen can outweigh the reductions achieved by burning hydrogen in a gas plant. Using renewable energy sources for electrolysis to produce hydrogen can result in “green hydrogen” with no carbon emissions, but the carbon implications of diverting existing renewable energy need to be considered.
Hydrogen production through electrolysis requires a significant amount of electricity, which may come from renewable sources or high-carbon sources. The renewable energy requirements for producing hydrogen can be substantial, with electrolysis being less efficient than directly using solar or wind energy.
In addition to carbon emissions, burning hydrogen in gas plants can lead to increased nitrogen oxide emissions, water consumption, operational costs, and electricity usage. Investing in hydrogen burning perpetuates the use of gas plants and may not be the most effective solution for reducing carbon pollution.
Renewable energy sources like solar and wind offer a more efficient and environmentally friendly alternative to cutting gas plant pollution. By directly displacing gas generation with renewable electricity, communities can achieve greater reductions in carbon emissions without the drawbacks associated with hydrogen cofiring. The key takeaway is to use gas plants less by utilizing renewables more to address the challenges of carbon pollution in the power sector.
