What is gray energy? And what role does this "invisible" energy play for the real estate industry? In the course of European climate protection, the emissions from the production of building materials and the associated energy consumption are increasingly coming into focus.
GRAY ENERGY DEFINITION: WHAT IS GRAY ENERGY?
Gray energy is the term used to describe the primary energy that goes into the production, transport and storage of materials, for example. Up to now, gray energy has not been included in the balance sheets of a property. There, one only looks at the energy output during operation. But not according to what a building consumes in terms of energy over its entire life cycle - in other words, from construction to operation to subsequent deconstruction.
"In terms of sustainability and climate protection, it is essential not only to work on the direct CO2 emissions of buildings in operation, but also to minimize the gray energy."
Maria Hill, ECE Director Sustainability & Corporate Communications.
In this context, concrete is a huge issue. Its production causes a lot of CO2. The question is: How can it be replaced? Possible alternative building materials could be wood or recycled concrete.