Illinois’s Climate and Equitable Jobs Act sets a goal of 100 percent clean energy by 2050, but offers limited direction on reducing emissions from gas used in buildings and other sectors. A new Gas Decarbonization Pathways Study, commissioned by the Illinois Commerce Commission (ICC), examines options for aligning the gas system with that goal.
The study models five possible pathways, ranging from electrification and energy efficiency to continued gas use supported by alternative fuels. Its authors say the report’s assumptions contain significant flaws that make comparisons between scenarios unreliable. Even so, the analysis finds that gas use in Illinois buildings and industrial facilities needs to decline by at least 50 percent to reach net-zero emissions by 2050. Across all five modeled pathways, gas use falls by about 50 to 85 percent.
Heat pumps feature prominently in every feasible scenario. The study estimates that between 52 and 97 percent of Illinois homes would need electric heat pumps by 2050, compared with 3 percent today. In three scenarios considered more feasible by the report’s commentators, annual heat pump sales rise from 40,000 in 2025 to roughly 300,000–400,000 in 2050.
The study also projects that gas rates could increase fourfold to 25-fold by 2050, as infrastructure costs are spread across fewer customers and, in one scenario, alternative fuels add expense. It finds that all-electric customers would have significantly lower average monthly utility bills than gas customers by that point. The report’s authors argue that helping low-income households switch earlier could reduce the risk of leaving them on an increasingly costly gas system.
The article’s authors caution against treating pathways that depend heavily on unproven fuels as equivalent to electrification-focused options. The modeled fuels include biomethane, green hydrogen and e-methane, which the study assumes can be made using green hydrogen and carbon captured directly from the air. The article says these technologies face questions over availability, cost and readiness, and notes that e-methane remains at the prototype and demonstration stage.
The study also considers a managed transition that avoids continued investment in replacing old gas pipelines by electrifying the households they serve. The report describes potential savings from this approach as illustrative, rather than based on an Illinois-specific engineering assessment. The article’s authors say the state should require long-term gas-system planning to better understand the costs of managed and unmanaged transitions.
Other steps they recommend include ending ratepayer-funded subsidies for new gas connections and accelerating heat pump adoption, particularly among low-income households. They also point to possible measures such as updating building codes for new construction, increasing utility incentives and adopting a clean heat standard, as outlined in Illinois’s Comprehensive Climate Action Plan.
Sources: CleanTechnica.