From December 31, 2025, the ARENH, the system of regulated access to historic nuclear electricity disappears! It allowed companies to benefit from access to nuclear electricity at regulated prices (€ 42/MWh).
Faced with this news, what to do to anticipate?
- Energy sobriety: consume less
- Energy efficiency: consume better
Energy efficiency and sobriety will establish itself as strategic levers.
What is ARENH?
Since 2011, ARENH has allowed electricity suppliers to buy part of the nuclear electricity produced by EDF at a regulated rate (€ 42/MWh). A price well below those on the wholesale market, currently around € 70/MWh on the EPEX SPOT market.
Thanks to the ARENH, therefore, energy suppliers could offer more competitive electricity prices to businesses.
But from December 2025, a state reform imposed a new method of calculating prices, based on market prices rather than on the real price of electricity production in France. In exchange, EDF will be taxed on its profits made by selling its nuclear production on the wholesale markets.
Towards an invoice up 40%?
With the disappearance of ARENH, the price of electricity will depend more on the wholesale market, where fluctuations are greater. The UFC-Que Choisir underlines in a study* that this reform is based on a new mode of calculation, based on unstable prices, instead of the actual cost of production in France: if this reform had been applied from 2025, the supply cost used to fix the regulated prices would have climbed to € 117.29/MWh for consumers, a vertiginous increase of 44 % compared to (€ 81.37/MWh).
How to prepare yourself?
Real estate directors and energy managers will have to anticipate a significant increase in their energy costs, especially for highly consumer sites. Buildings poorly insulated or heated to electricity will be particularly exposed.
Faced with this announced increase, it becomes crucial to implement sobriety and energy efficiency strategies:
10 to 15% savings thanks to energy sobriety
These actions which require little investment to initiate a sobriety approach already reduce your energy consumption by 10 to 15%, according to the barometer of the Sustainable Real Estate Observatory (OID).
Energy savings competition, awareness workshops such as the fresco of energy sobriety, display campaigns, so many useful levers.
Accelerate the transition to action on your buildings
In the medium and long term, it is time to accelerate the transition to action on your buildings to massify your energy savings.
Faced with under tension budgets and in an increasingly demanding regulatory context (Tertiary Eco Eco Eco Decree, Bacles Decree, APER law), the energy transition of tertiary buildings can no longer wait.
With our Datamarc Neo energy piloting platform and its new my Eco Performance module, wealth managers, real estate directors or even energy managers can control and secure their energy savings thanks to a three -step approach:
- A digital audit : identification of energy performance scenarios and reduction objectives.
- A fluid implementation of actions : automatic synchronization of work carried out and objectives on the platform.
- A follow -up of gains in real time : comparison of consumption before/after work with an integrated measurement and verification plan (PMV).
The key : total visibility on the profitability of investments and securing commitments, in particular in the context of energy performance contracts (CPE).