Oranienstein Castle in Diez

Improve your building’s energy efficiency with energy performance contracting

A building doesn’t have to be new to be green. We can help you convert your existing buildings into models of sustainability through energy retrofits, an innovative form of energy performance contracting which minimises financial risk and guarantees energy savings.


We have built our reputation and strengthened our experience through the implementation of more than 2,600 Energy Performance Contracts, with on-going savings of more than €3.5 billion (£2.92 billion) for our customers.