Federal Judge Upholds Denver's Local Ban on Natural Gas Appliances Against Industry Lawsuit

On August 7, 2026, Chief U.S. District Judge Philip A. Brimmer dismissed a lawsuit aimed at striking down Denver's restrictions on natural gas appliances in new commercial and multifamily buildings. The ruling marks a significant moment for municipal energy policy, clarifying how local governments can regulate building emissions without running afoul of federal manufacturing standards. For developers, restaurant owners, and building managers, the actionable takeaway is clear: local codes dictating where gas appliances can be installed remain enforceable in Colorado. The transition toward electric heating and water systems in new large-scale construction will proceed as planned. The lawsuit, filed in July 2024 by a coalition of industry groups including the Restaurant Law Center and the National Association of Home Builders, sought to invalidate the city's updated energy codes. The plaintiffs argued that by setting emissions standards that gas-fired equipment cannot realistically meet, Denver was effectively banning the appliances and violating federal law.[1][2][4][5][6]

The mechanism at the heart of this legal battle is the federal Energy Policy and Conservation Act (EPCA). Enacted decades ago, the EPCA sets uniform energy efficiency standards for appliances before they reach consumers, ensuring that manufacturers do not have to navigate a patchwork of different state requirements. The industry coalition claimed that Denver's 2023 building codes circumvented this framework. They argued that by restricting the installation of gas appliances, the city was improperly regulating the energy use of federally approved products, which should be preempted by the EPCA. The plaintiffs maintained that energy policy must be set at the national level, warning that a localized approach creates an unsustainable regulatory burden for businesses operating across multiple jurisdictions.[1][2][4][7]

However, Judge Brimmer's ruling drew a sharp legal distinction between regulating how an appliance is manufactured and regulating where it can be safely installed. The court found that Denver's rules govern the latter. Because the city's codes do not impose new efficiency requirements on the manufacturers themselves, they do not trigger federal preemption. Judge Brimmer explicitly noted that the 2023 standards regulate appliances purchased by consumers, rather than imposing requirements on manufacturers, and therefore do not regulate energy use as contemplated by the EPCA's preemption provision. The ruling effectively preserves the historical authority of local governments to dictate zoning, safety, and building codes within their own borders.[1][2][6]

This interpretation aligns with a June 2026 ruling from the Second Circuit Court of Appeals, which upheld similar restrictions on fossil-fuel appliances in New York City and New York State. Both courts concluded that the EPCA guarantees uniform manufacturing standards, not a consumer's absolute right to use a specific fuel source in new construction. Environmental advocates, including the Sierra Club and Earthjustice, who intervened in the case to defend the city, viewed the dismissal as a crucial validation of local authority. They emphasized that transitioning to modern electric systems like heat pumps will ultimately reduce utility bills, improve indoor air quality, and protect residents from the volatile price swings associated with fossil fuels.[1][2][3]

Despite the ruling in Colorado, the national legal landscape remains deeply fractured. The recent decisions in Denver and New York conflict directly with a 2024 Ninth Circuit ruling that struck down a natural gas piping ban in Berkeley, California. The Berkeley decision interpreted the EPCA much more broadly, determining that local bans on gas infrastructure effectively prevented consumers from using federally covered appliances, thus violating the law. During the Denver proceedings, the Restaurant Law Center relied heavily on the Ninth Circuit precedent, but Judge Brimmer found that argument unpersuasive, siding instead with the logic of a dissenting judge in the Berkeley case.[1][2][4]

This resulting circuit split means that the enforceability of local gas restrictions now depends entirely on geography. For national developers and restaurant chains, this creates a complex compliance environment where identical building designs are legal in one state but prohibited in another. Legal analysts suggest that this geographic disparity is unsustainable for the construction and appliance manufacturing industries. Because federal appellate courts are now issuing contradictory rulings on the exact same provision of the EPCA, the issue is increasingly viewed as a prime candidate for eventual review by the United States Supreme Court.[1][4]

In Denver, the immediate effect of the ruling is that the city's Energize Denver program will continue unabated. The program requires new commercial and multifamily buildings to utilize electric space and water heating, supporting the city's broader goal of achieving net-zero greenhouse gas emissions in existing buildings by 2040. City officials have maintained that the program is not a forced switch for existing residential homes, but rather a forward-looking standard for new, large-scale construction. The city's 2025 annual report highlighted significant progress, noting a 26 percent increase in heat pump permits and a 10 percent decline in gas space heating permits compared to the previous year.[5]

Conversely, trade associations warn that the forced transition will impose steep upfront costs on building owners, which could cascade down to tenants in the form of higher rents and operational challenges for commercial kitchens. The Colorado Apartment Association and other groups have consistently argued that the formulas required to meet the city's emissions targets leave electrification as the only viable option. For now, the dismissal was granted with prejudice, meaning the plaintiffs cannot refile the exact same claims in this specific district court. However, as local governments across the country continue to assert authority over building emissions, the debate over how to balance local climate goals with federal energy policy remains one of the most contentious issues in urban development.[1][4][5][6][7]