3. Heat storage

Heat is a sizeable part of energy consumption. It represents just over half of the final energy consumption in France. The building sector consumes more than 40 % of the final energy including 2/3 in residential. This sector emits nearly 30 % of CO ₂ emissions, essentially due to heating which contributes approximately 70 % of these emissions. Reducing the consumption of fossil fuels in this sector by managing heat consumption better is therefore a major objective. Heat storage is one of the elements in achieving this. Heat pumps are often used in heat storage, allowing excellent power efficiency.

As with electricity, it is interesting to store heat when it can be produced at low cost, whether surplus or unused. For the individual, it is therefore advantageous to produce and store heat when electricity is cheaper (at...