The 2025 State of Sustainable Fleets Market Brief, released by TRC Companies at the ACT Expo in Anaheim, California, discusses the industry's response to regulatory uncertainty and its investment in sustainable transportation solutions. Despite federal policy shifts and economic uncertainty, the market continues to grow, with over $13.5 billion in state and local funding available for zero-emission and near-zero-emission projects. The report highlights the increasing adoption of renewable fuels, electric vehicles, and hydrogen fuel cell electric vehicles. Key findings include the growth of renewable diesel and renewable natural gas adoption, the surge in battery-electric vehicle deliveries, and the challenges faced by hydrogen vehicles. The report also discusses the impact of policy and funding on the industry, including the pause of certain federal disbursements and the continuation of state-driven programs. Despite uncertainties, the industry remains focused on cleaner, safer, and more efficient transportation solutions. Partners like Volvo Trucks North America and Chevron emphasize the importance of sustainable energy solutions and support for fleets in their transition towards cleaner transportation. The report identifies trends in diesel, natural gas, battery-electric, and hydrogen vehicles, showcasing the diverse landscape of sustainable fleets in 2025.