When replacing a gas boiler in a house from the 1980s, one quickly encounters a reality: the choice of equipment depends as much on current regulations as on the available budget. The energy transition in France is not just a distant goal of carbon neutrality. It translates into concrete constraints on installations, financial aid, and the energy mix that powers our homes and businesses.
End of gas boilers in new builds: what it changes on the ground
The French roadmap for phasing out fossil fuels stipulates that it will no longer be possible to install gas boilers in new constructions starting at the end of 2026. For building professionals, this is not a surprise: the RE2020 already pushed towards heat pumps and efficient electric heating.
The direct consequence affects project owners who still relied on gas for cost reasons. The electrification of heating is becoming the regulatory norm, not just a virtuous option. For the existing stock, feedback varies depending on the insulation of the building and the climate zone, but the trend is clear: every new project must integrate this constraint from the design phase.
Useful resources to follow these developments can be found at https://ag-energie.org/, which gathers information on energy sectors and their stakeholders.
MaPrimeRénov’ in 2026: stricter rules for energy renovation
A decree from August 25, 2026, published in the Official Journal, has profoundly modified the MaPrimeRénov’ scheme. Several categories of so-called “gesture-based” works (one single piece of equipment replaced, without a global vision of the renovation) have been removed. The focus is shifting towards high-performance renovations, combining insulation and system changes.
The same text extends until December 31, 2027, the possibility of using the “gesture-based” pathway for homes classified F and G. This is a pragmatic acknowledgment: the most degraded thermal sieves cannot all transition at once to a comprehensive renovation, due to lack of resources or aligned co-ownerships.
Hybrid heat pumps excluded from funding
The decree removes the possibility of financing heat pumps with fossil fuel backup through MaPrimeRénov’. In clear terms, hybrid gas equipment is no longer eligible for public aid. For a household hesitating between an air-water heat pump and a hybrid system, the financial calculation clearly shifts in favor of all-electric solutions.
This tightening accelerates the exit from fossil fuels in the residential sector. Installers must adapt their offerings, and individuals should check eligibility criteria before signing a quote.
Negative prices and renewable energy curtailment: a network problem
France has expanded its renewable energy curtailment mechanism since December 2026. The power threshold at which an installation can be remotely disconnected from the grid has been lowered to 1 MW. The goal: to avoid episodes of negative prices in the electricity market when production far exceeds consumption.
This issue remains little visible in public debate. There is much talk about the development of renewables, but managing surpluses of solar and wind production has become a major operational challenge. When the sun shines and the wind blows simultaneously on a Sunday in May, the grid must absorb or store this energy, or risk destabilizing prices and infrastructure.
What it implies for producers
Operators of solar or wind farms over 1 MW must now accept curtailment controlled by the grid manager. This directly affects their economic model:
- Lost production hours during curtailments reduce annual revenue, without systematic compensation
- Power purchase agreements (PPAs) must incorporate this variable, complicating negotiations with industrial buyers
- Investors are reassessing the profitability of projects in areas already saturated with renewable capacity
The energy transition is not solely about installed capacity. It also involves the network’s ability to absorb what is produced.
Redirecting savings towards the transition: the missing link
Financing the energy transition requires massive investments, and France has one of the highest stocks of private savings in Europe. The problem, regularly raised by financial analysts, lies in the redirection: French savings are mostly directed towards investments that are poorly connected to decarbonization needs.
Livret A, life insurance in euro funds, real estate: traditional supports only direct a fraction of capital towards energy infrastructures, networks, or thermal renovation. Some mechanisms exist (green funds, sustainable bonds), but their share remains marginal in household portfolios.
An underutilized legal framework
France has a sophisticated economic law regarding sustainable finance. The regulatory tools are there: European taxonomy, reformed ISR label, extra-financial reporting obligations for asset managers. What is lacking is the connection between these tools and individuals’ savings decisions, often guided by habit or standardized banking advice.
As long as this savings is not better directed, financing the transition will primarily rely on public spending and institutional markets, with the known budgetary limits.
The energy transition in France is advancing through regulatory jolts: banning gas in new builds, tightening MaPrimeRénov’, managing renewable surpluses. Each measure alters the concrete choices of households, installers, and investors. The framework is changing rapidly, and those who are renovating or building have every interest in checking the rules of the game before launching their project.