Delaware Sustainable Energy Utility (DESEU) is who we are—a nonprofit 501(c)(3) organization created by the State of Delaware. Through our many Energize Delaware programs, we help residents, businesses, farmers, schools, religious organizations, nonprofits, hospitals and local governments save money. We do it by providing access to high-efficiency heating, cooling, ventilation and insulation technologies at little or no cost.

Making Homes More Comfortable and Affordable.

Our programs help improve your home’s coziness and safety while reducing its energy consumption. In-home energy audits identify exactly what’s needed—from new insulation, windows or doors to higher-efficiency appliances and HVAC equipment. All to make your home more comfortable and affordable.

See our residential programs

Improving Bottom Lines For Businesses, Government and Nonprofits.

We also help companies, governments, nonprofits and faith-based organizations save energy and money. We provide commercial-grade energy audits and recommendations, revolving loan and energy investment funds, grants for clean solar and geothermal energy, and other initiatives.

See our nonresidential programs

Our Valued partners.

Energize Delaware partners with utilities, public-advocacy and community-action groups, and other organizations. Together, we offer our programs to people statewide to help protect against volatile energy prices, reduce the environmental impact of energy production and lead Delaware to a sustainable energy future.

Our Partners

The latest on energize delaware news and initiatives.

October 7, 2021

Many existing government programs and policies and non-profit missions seek to reduce poverty, provide affordable housing, essential resources, education, health and jobs for underserved communities. But increasingly there is a role for promoting energy efficiency and clean energy as a tool to mitigate poverty. “Households with high energy burdens are more likely to remain in…

Read More
April 13, 2021

Franklin Energy, a leading provider of energy efficiency and grid optimization solutions, announced today that its client Delaware Sustainable Energy Utility (DESEU), through their Energize Delaware initiative, has received the ENERGY STAR Partner of the Year—Sustained Excellence Award from the Environmental Protection Agency and the Department of Energy for the fourth consecutive year. The agencies…

Read More