Denver’s Office of Climate Action, Sustainability and Resiliency’s (CASR) 2025 Annual Report. This report details the city's significant progress in ensuring that every Denver neighborhood is powered by clean energy and protected from climate risks.

The launch of CASR’s 2025 Annual Report launches alongside a new online tool that lets Denverites explore the city’s greenhouse gas emission sources and trends.

Denver's emissions continue to decline, propelled by strong gains in clean energy, electrification and efficiency. The grid powering Denver continues to get cleaner, and more people are adopting all-electric solutions to heat and cool their homes. These reductions reflect Denver’s sustained commitment to climate action and the hard work of community members, businesses, partners and staff across the city.

We approach emerging needs around energy use and resiliency, like data centers, by pursuing policies that make our grid more resilient (like Energize Denver and Denver’s Energy Code) and staying consistently engaged at the Colorado Public Utilities Commission to ensure that Denver ratepayers are delivered renewable, affordable and reliable energy that they expect.

2025 marked a major milestone in Denver’s journey to achieve science‑based emissions targets. In 2019, working with urban sustainability experts and guided by international climate science, Denver set a goal to reduce greenhouse gas emissions by 40% from a 2019 baseline by 2025, with the ultimate goal of eliminating emissions by 2040.

From 2019 to 2025, Denver achieved a 20% overall reduction in emissions. Looking at the longer trend, emissions decreased approximately 36% from 2015 to 2025.

Denver set science‑based climate goals because the scale of the challenge demands ambition. Science‑based greenhouse gas (GHG) targets reflect what global climate science shows is necessary to limit warming to 1.5°C. Our goal is scaled down to the city level, but we do not control all the levers to reduce emissions. Even so, Denver chose these goals because leadership means aligning our work with what the science requires.

While we did not meet the 2025 target, our progress is real, measurable and accelerating. Every investment moves us closer to a cleaner, healthier and more resilient Denver, and the progress we saw in 2025 sets the foundation for the years ahead.

CASR’s Annual Report highlights Denver’s key 2025 progress on climate resiliency, including:

• 2,000 clean energy systems installed, 4,500 trees planted and 20 million gallons of municipal water usage cut, meeting and exceeding the citywide annual goal.
• 55% of Climate Protection Fund dollars invested equitably in Denver’s disproportionately impacted communities.
• 4.5% projected reduction in greenhouse gas emissions over the course of only one year.
• 15% increase in the number of clean energy systems installed through the city’s Climate Protection Fund programs.
• 26% more heat pumps and 38% more heat pump water heaters permitted than the year before.
• Three times more all-electric buildings permitted compared to the prior year.
• 830,000 miles of car trips replaced with e‑bike trips from Denver’s e‑bike rebate redeemers.
• 458 Denverites trained or upskilled in clean energy or natural resource management careers.
• 572 air purifiers and 155 air conditioners installed in neighborhoods facing the greatest heat and air‑quality burdens
• 131.1 million impressions made by the groundbreaking “Do More. Do Less. Do Something” campaign, which inspired 1 in every 4 Denverites who recognized the campaign to commit to taking more climate‑friendly actions.

To view all of CASR’s annual reports in English and Spanish, click here. The 2025 CASR Annual Report will be available in Spanish in August 2026. I also invite you to share our annual report post on LinkedIn.