ProjectZero is a public-private partnership operating in Southern Denmark, with a core base in Sonderborg. ProjectZero was established in 2007 by Sonderborg Municipality, Syd Energi, Danfoss A/S, among others. As part of its goal to improve energy efficiency by 48% in the Sonderborg-area by 2029, ProjectZero has provided energy retrofit consultancy to more than 1100 house owners, who have initiated energy renovation projects for more than DKK 100 million. ProjectZero has inspired municipalities throughout Denmark and abroad to initiate similar programs, and moreover maintains a valuable database documenting its energy retrofit activities with citizens.