Resale of electricity divided by three, downward aid: why the French turn massively to solar storage

It was a turning point that individuals had not necessarily anticipated. Since March 27, 2025, S21 decree deed the drop in buying prices of Solar electricity injected into the network. The price of the surplus thus goes from 12.7 to 4 cents per kilowatt hour, a fall of 66 %. Added to this is a 66 % drop in installation aid. Result, this economic model loses its interest.

In this context, could domestic storage establish itself as a popular alternative? According to a study conducted in March 2025 by OpinionWay for Beem, 68 % of French people say they want to store their energy to face the continuous increase in prices and keep their invoice control. And they are a majority to think that the cost of energy will continue to climb.

One solution: Store at home what you produce

To adapt to this change, the new trend in energy storage at home therefore seems to arouse the interest of households. Several players in the sector are focusing on this development in order to no longer depend on resale on the network to enhance their production, but use it directly when possible or keep it for later.

The Nantes company Beem, which markets the Beem Battery, highlights fairly telling figures: a family home made up of four people and equipped with a solar system with battery in Nantes could save nearly 40,000 over 20 years, compared to € 20,000 without battery. The return on investment would fall at 10 years, against 11 for an installation without storage.

The concept appeals, especially the most consumer households since the savings made can be quite significant. The company, which aims at the 20 % market share in residential storage by the end of 2025, is not alone in this niche. Zendure, Anker Solix, Ecoflow or other players also offer high -capacity batteries, generally connected and configured for intelligent management. These solutions make it possible to optimize domestic consumption according to full hours, hollow, sunshine and the needs of the home at the time.

A solar battery plays a key role in a photovoltaic installation, because it allows you to store the energy produced during the day, while few devices at home are in demand, in order to return it later, when the panels no longer produce.

The energy produced by solar panels is first used to directly supply the house equipment. Electricity not consumed immediately, it is directed to the battery, where it is stored in the form of direct current. The quantity stored obviously depends on the capacity of the battery.

When solar production weakens, in covered weather or at dusk, the battery automatically takes over. It releases the electricity stored to power the house thanks to a inverter which converts the direct current by alternating current (AC), compatible with domestic devices.

Some batteries are able to intelligently manage these charging cycles and discharge thanks to a sensor placed between the counter and the electrical panel. This system detects in real time the variations in production and consumption, and instantly adapts the behavior of the battery. If most solutions are Plug & Play And can be implemented by all individuals, the installation of the intelligent meter at the level of the fireplace of the household may require the intervention of a third party, according to the knowledge of the buyer.

An attractive aspect in the event of a cut, but local aid that is not very readable

Beyond the economic aspect, this turn towards self-consumption seduced by the energy autonomy provided to households. The solar batteries integrate rescue functions capable of supplying a house for several hours in the event of a cut, following breakdowns like The one who touched Spain recently, or a natural disaster.

For individuals, the promise is no longer just to reduce their bill, even if the most obvious benefit remains that of the impact on the wallet created by market instability. For 10 years, the prices of electricity have actually jumped by 80 %, and this increase should continue after the end of the regulated access to nuclear electricity (ARENH) in January 2026. The majority of French people believed it hard as iron: 79 % believe that the price of energy will continue to progress.

If the storage is gaining ground, certain limits persist. The study conducted by Beem reveals that 61 % of French people ignore the existence of local aids for solar installations. And only 4.5 % deem them sufficient. What slow down the adoption of photovoltaics, despite the wish to control its energy expenses.

5 questions to Ralph Feghali (CEO and co -founder of Beem)

Numériques – You announce gains of € 40,000 over 20 years with the Beem Battery for a Nantes home for four people. How are they calculated?

Ralph Feghali – The € 40,000 in savings mentioned are based on a concrete example, representative of a living home in Nantes, equipped with a 6 kwc Beem Roof solar installation with a 6.6 kWh Beem Battery. Here are the parameters we used for this simulation:

• Estimated annual solar production: 6975 kWh (solar installation facing south, tilt at 30 °)
• An average annual home consumption: 7,500 kWh
• Electricity price on the basis of the price in force: € 0.20/kWh
• SURPLUS buyout rate: € 0.04/kWh (in accordance with the S21 decree)
• Estimated energy inflation: 5 %/year

Thanks to the Beem Battery, this household reaches an autonomy rate of 70 %, against 30 % with an installation without battery. This makes it possible to optimize self -consumption and avoid reselling at a very low rate, while protecting itself from the upcoming increases in the price of electricity.

Over a period of 20 years, this represents around € 38,000 in accumulated savings, or € 1900 per year on average, at a cost of installation from € 15,000 including tax, which results in a net gain of € 23,000 with a time of return on investment of 10 years.

We would like to point out that these figures are provided for information and can obviously vary depending on the location, consumption habits and regulatory developments.

LN – What are the current brakes on the development of storage on solar battery (price, regulation, technical knowledge, etc.)?
Rf – Today, storing your solar energy is not yet a massively adopted approach. A real pedagogy work is necessary so that consumers understand the challenge of energy decentralization, the economic interest of the adoption of storage and the available technology. We are at the very beginning of the battery era!

However, the drop in the resale rate recently divided by three, makes storage the most profitable solution for households. From a tariff point of view, if this factor can be a brake for some, the reality is that the solutions are increasingly accessible with profitability over 10 years for installations for decades and financing solutions that allow larger savings than its monthly payments from the first year. Technically, the Beem Battery requests significant DIY skills if we want to install it alone, but our qualified installers offer a less confident obstacle course.

LN-Do you plan developments for your solar battery in the coming years (AI, home automation)?
Rf – With eight patents deposited, R&D has been at the heart of the Beem ecosystem for five years. So we would find it difficult to prevent ourselves from changing our storage solutions! Indeed, we are continuously developing energy optimization solutions, including artificial intelligence already integrated into our optimization of the Beem Battery flows. We would like to go further by offering personalization accompanied by AI on a daily basis. Stay Tuned!

LN-Is home storage relevant in all regions of France, or especially in the south?
Rf – Here is the percentage of our users by region (TOP 10), which shows that our solutions are not only attractive in the South.

• Pays de la Loire: 12 %
• Auvergne-Rhône-Alpes: 11 %
• New Aquitaine: 10 %
• Nord-Pas-de-Calais-Picardie: 10 %
• Occitanie: 9 %
• Île-de-France: 8 %
• Brittany: 8 %
• Grand-Est: 7 %
• Provence-Alpes-Côte d’Azur: 7 %
• Normandy: 6 %

These results testify not only to increased receptivity in the face of solar solutions in these regions, but also a collective awareness of economic and environmental advantages linked to solar self -consumption. These areas, often benefiting from favorable sunshine, are on the front line in the country’s energy transition.

Note : Study conducted on a sample of 631 respondents (users and prospects)

LN – What is the current type profile of Beem users?
Rf – People who wish today their energy autonomy are both in search of taking control over their energy bills, thus reducing up to 80 % their costs on this expense post, and of control of their home. Home automation, optimization and ecological impact of their home are important to them. Our customers are very often owned, except for the solar kits which can move endless. Finally, if many were many were Early adopterstoday we have a clientele more reassured by the installations already made. 20 % of our customers have known us by another Beemer.