Almost everywhere in the Dordogne there is a south-facing wall getting around 1,500 hours of usable sunshine a year, doing precisely nothing with it. Its owner is paying EDF the full Tarif Bleu rate for every kilowatt-hour they use — €0.2516 in 2025–26 — and has been told by at least one installer that solar "involves a lot of paperwork." That is not wrong. A full grid-connected PV system with feed-in metering, CONSUEL certification, and Déclaration Préalable does involve paperwork. But that is not the only solar option available to a homeowner in France in 2026.
The Wall Street Journal recently ran a piece framing plug-in solar as a novel American discovery. It is not. Continental Europe — Germany in particular, with over 1.5 million registered balcony-solar units — has been running this experiment at scale for years. France has its own formal framework for exactly this kind of installation, quietly updated and clarified since 2023. Most English-speaking homeowners here have never heard of it.
This article explains what the French framework actually is, what it realistically saves for different household types, and where its limits lie.
What plug-in solar actually is
A plug-in solar kit — called panneau solaire plug and play in French — consists of one or two PV panels, a micro-inverter, and a short cable that plugs into a standard wall socket. The micro-inverter converts the panels' DC output to AC at 230V, 50Hz. That AC power feeds backward through the socket into your home's circuit, reducing the net load your meter sees at any given moment.
You are not selling electricity to the grid. You are not building a power station. You are simply reducing what you draw from EDF during daylight hours. An 800 W system producing at full output while your fridge, router, and a few lights are running will reduce your import by roughly 800 W at that moment — or more precisely, by however much of its output your live consumption absorbs before it would reach the meter.
The safety concern that has historically been raised — anti-islanding: the risk that a plug-in inverter continues generating during a grid outage, potentially energising a dead line and harming a utility worker. All modern grid-tie micro-inverters certified to the relevant European standard (NF EN 50549 in the French context) have mandatory anti-islanding protection built in. They detect grid loss within milliseconds and shut down. This is not an optional feature; it is a certification requirement.
You are not building a power station. You are simply reducing what you draw from EDF during the hours the sun is up.
What a realistic system looks like
Most plug-and-play kits currently sold in DIY outlets and online in France now centre on an 800 W AC micro-inverter paired with two panels of 380–420 Wp each. Brands like Zendure SolarFlow 800, Hoymiles HMS-800, and I'M Solar are explicitly marketed and sold in France with CACSI compliance in mind. Prices for a complete 800 W kit — panels, micro-inverter, mounting hardware, and cable — run from around €350 to €700 depending on brand and panel quality. Installation is a one-person job taking two to three hours; no electrician required for the connection itself.
The PVGIS yield data for southwest France is generous. At our Dordogne coordinates (45.3°N, 0.9°E), a south-facing installation at 35° tilt produces approximately 1,250–1,350 kWh per kWp per year in a good year. An 800 Wp kit will therefore produce around 1,000–1,080 kWh annually — call it 1,040 kWh as a working figure.
That ~€202/year figure assumes all of the generated electricity is self-consumed — i.e., your household is drawing at least 800 W at the moments the panels are producing. In practice, a household that is occupied during the day (permanent residents, gîte guests, home office workers) will self-consume the vast majority of that output. A second home that is empty Monday through Friday will self-consume far less, and the effective saving will be lower. We model both scenarios in Part Three.
The French legal framework — what it actually involves
This is the section most English-language coverage gets wrong, either by overstating how simple it is or by overstating how complicated it is. The honest answer is: it is genuinely simple, but it has specific steps and those steps matter.
Autoconsommation totale and the CACSI
France's framework for plug-in solar is built around a concept called autoconsommation totale — total self-consumption. It means you produce electricity at your property, you consume all of it on site, and you inject nothing into the public grid. There is no sale, no feed-in tariff, and no revenue. The only financial benefit is the reduction in what you import from your supplier.
The governing document is the CACSI — Convention d'autoconsommation sans injection. In plain English, it is a short formal agreement between you and Enedis (the distribution network operator) recording that your property has a small generation system and that you commit not to export surplus electricity to the network. It is free. It is not a contract to pay for anything. It simply notifies the grid operator that this site has its own generation, and guarantees them that nothing unexpected will flow onto their network.
Enedis requires a declaration for any production installation in autoconsommation totale, regardless of size. There is no "under X watts you can skip this" exemption. The simplification compared to a full grid-connected system is in the process — the paperwork is lighter, the Consuel requirement may be waived for certified equipment — but the obligation to declare exists at any power level. Anyone who tells you a 400 W kit needs no notification is not reading the current Enedis guidance.
The three practical steps
Declare via Enedis-Connect
Log into the Enedis-Connect portal and complete the declaration form for your installation — address, peak power, micro-inverter model, panel specifications. This is a standard online form. For a straightforward plug-and-play kit, it takes around ten to fifteen minutes. Enedis processes it and returns a reference number.
Accept the CACSI
The CACSI document is integrated into the Enedis-Connect process and is accepted digitally. You are confirming that your installation will not inject electricity into the public network. This is the contractual core of the whole arrangement — and it is what distinguishes a compliant plug-in system from an unregistered one.
Consuel certificate or attestation sur l'honneur
A full Consuel electrical inspection is required for most production installations. However, Enedis explicitly provides a dispensation pathway for pre-assembled plug-and-play equipment that is certified to NF EN 50549 (the relevant European standard for small inverters connected to low-voltage networks). In practice, this means that for a commercial kit with certified components, you can substitute an attestation sur l'honneur — a signed declaration that the equipment meets the standard — rather than commissioning a Consuel visit. Verify that your specific kit and micro-inverter carries the relevant certification before relying on this dispensation.
One additional practical point for anyone in rural Dordogne with an older property: if you still have a pre-Linky electromechanical meter, Enedis will require a swap to a Linky smart meter as part of the autoconsommation totale process. Linky is mandatory here because only a bidirectional smart meter can correctly measure any residual flows. In the majority of rural Dordogne, Linky rollout is already complete, but it is worth checking before you start.
The simplification is in the process, not in the obligation. A declared system is a compliant system. An undeclared one is not — whatever its size.
A word on the "600 W limit" myth
English-language coverage of plug-in solar — including most of what you will find in expat Facebook groups — refers to a "legal limit of 600 W" as though it were a French regulatory ceiling. It is not. Enedis does not publish a power threshold above which declarations become required and below which they do not. The declaration obligation applies "quel que soit son niveau de puissance" — whatever the power level.
The 600 W figure was a market norm from an earlier generation of kits. The standard in DIY outlets and online today is 800 W — and some manufacturers are already pushing to 900 W and beyond. None of this changes the regulatory framework: declare the system, sign the CACSI, use certified equipment, and the power level is your choice within what the kit offers.
What it actually saves — four expat personas
The headline yield figure of ~€202/year for an 800 Wp south-facing system in Dordogne is a starting point, not a destination. What a specific household actually saves depends on three things: how much electricity it consumes during daylight hours, how much of the year the property is occupied, and what tariff it is on. Here are four honest scenarios.
Permanent resident, home during the day
Semi-retired couple, Périgord. Moderate consumption ~8,000 kWh/year. Home office, pool pump May–Sep, standard appliances. On TRV Tarif Bleu.
High daytime occupancy means near-full self-consumption of generated output. Payback on a €480 kit is around 2.4 years. At 5-year horizon, net benefit ≈ €500+ after kit cost.
Strong case — proceedGîte owner, 28-week rental season
Owner-occupied shoulder months, guests in summer. Kitchen and laundry running heavily during rentals. Interested in reducing bills and demonstrating eco-credentials.
High consumption during rental periods aligns well with peak generation. Self-consumption rate ~82% over occupied weeks. Payback ~2.9 years. Also a visible sustainability talking point for rental listings.
Strong case — proceedSecond home, used 6–8 weeks/year
Property near Sarlat. Owners visit Easter, July, and August. Property otherwise empty and on low base tariff. Limited daytime consumption during visits.
Low self-consumption rate (~27%) because property is unoccupied most of the time. Generated power that finds no load in the property simply reaches the meter unabsorbed — and under CACSI/no-injection rules, it cannot be exported. Payback over 8 years at this rate.
Marginal — do the maths firstLarge property, high consumption, complex heating
500m² stone house, wood + oil heating, ageing electrical installation. Annual consumption ~18,000 kWh. Considering full PV system. Thinking of a plug-in kit "to test the concept."
Saving is real — high consumption means full self-absorption of output. But €202/year on an €18,000 kWh annual bill is barely 1% of the problem. A properly sized full system (10–15 kWp + storage) could offset 55–70% of consumption. The plug-in kit won't inform that decision — an assessment will.
Real saving, wrong solutionEvery unit of electricity your plug-in panels generate that finds no live load in your house at that moment is wasted under a no-injection CACSI arrangement. Unlike a grid-connected system with export metering, surplus cannot be sold back or banked. A second home that is empty on a sunny Tuesday in June generates nothing of financial value on that Tuesday. The yield numbers assume a self-consumption rate of roughly 85–100% for occupied properties and drop sharply for empty ones. This is the single most important variable — and the one that glossy product descriptions consistently omit.
Yes — and the maths stay favourable further than most people expect. Two 800W kits total 1.6 kWc; three total 2.4 kWc. Both sit comfortably below the 3 kWc threshold at which the simplified CACSI process applies. You declare the combined power in a single Enedis-Connect submission, not separately for each kit. For a permanently occupied household, two kits roughly doubles the saving to around €390/year; three kits brings it to around €580/year.
Three kits is where the comparison with a proper roof installation starts shifting. At 2.4 kWc of plug-in hardware you are spending €1,400–1,500 on equipment with a shorter lifespan, no access to the prime à l'autoconsommation, and no ability to sell surplus — against a properly designed 3 kWc roof installation that would qualify for the feed-in premium, carry a 25-year panel warranty, and be sized around your actual consumption profile. The plug-in route is still within the rules at that scale. It is no longer obviously the right tool.
Four kits — 3.2 kWc — crosses the threshold entirely. That triggers a full Enedis raccordement request, mandatory Consuel certification, and a deliberate decision about whether to design for total self-consumption or surplus sale under a feed-in contract. At that point you are no longer in plug-and-play territory by any measure, and sizing and specifying without independent advice is where the expensive mistakes tend to happen.
When the €300 kit is not your answer
The case for a plug-in kit is strongest when a property is regularly occupied during daylight hours, has a south-facing surface with no significant shading, and is already on a metered tariff where every avoided kilowatt-hour translates directly into a cash saving. The case weakens the moment any of those conditions are absent.
It weakens further when the underlying question is not "can I save €150 this year" but "how do I heat this house for less, or make it resilient to grid outages, or reduce my annual electricity bill from €4,200 to something manageable." An 800 W plug-in kit is an experiment. It is not a strategy.
What distinguishes an experiment from a strategy
The distinction is not about the kit being good or bad. It is about whether it is the right tool for the question being asked. For Personas A and B above, it is exactly the right tool. For Persona D, the kit will save money, but acting on it without addressing the larger picture is a bit like patching one slate on a leaking roof and declaring the job done.
The risk is not the €300 kit. The risk is the €15,000 full installation that follows it — specced by someone selling you a system rather than advising you on one.
What to do next
If you are in Personas A or B, the path is clear: check your south-facing surfaces, get a kit certified to NF EN 50549, complete the Enedis-Connect declaration and CACSI before you commission it, verify whether your meter is already a Linky, and plug it in. The process is genuinely simple. The payback at current TRV rates is around two years for a permanently occupied household in Dordogne. It is one of the few energy investments where the arithmetic is almost always in your favour.
If you are in Personas C or D, the plug-in kit question is answerable in an afternoon. The larger question — what a correctly designed system for your property actually looks like, what it costs, what grants are available, and whether a full installation makes financial sense before or after any heating changes — is not. That question deserves a proper answer before any money changes hands.
High confidence on: PVGIS yield estimates (PVGIS-SARAH3, 45.34°N 0.99°E), current EDF TRV Base pricing (€0.1940/kWh, June 2026), German balcony-PV adoption scale, EU RED III prosumer rights direction. The one section that requires a last-minute check before publication is the exact Enedis process for autoconsommation sans injection — specifically the current CACSI wording, Consuel/attestation dispensation rules for plug-and-play equipment, and accepted power ranges for certified micro-inverters. These details have been updated several times since 2023. Verify against the current Enedis autoconsommation-totale page and the Service-Public CACSI template before relying on section details for any formal submission.
About the author
Mark Reade is the founder of The Energy Independent, a fee-paid, commission-free energy advisory service for English-speaking homeowners in Nouvelle Aquitaine. He lives in Périgord Vert with a 12 kWp solar PV system, 28 kWh of LFP battery storage, and a continuing interest in how much of the grid he can avoid. He does not sell equipment, receive commission from installers, or benefit from any outcome other than giving correct advice.
Footnote — buying in the UK and bringing it to France
A question that comes up regularly among second-home owners: can you buy a kit in the UK and install it in France, or vice versa? On the panels themselves, yes — they are passive DC devices and their country of purchase is irrelevant. The micro-inverter is another matter. For CACSI compliance in France, the inverter must be certified to NF EN 50549; UK-market inverters carry UKCA marking, not CE, and the two are not interchangeable for regulatory purposes. More practically: French kits are currently cheaper. An 800W kit in France runs €329–480 depending on brand and timing; the equivalent in the UK costs £478–600 — roughly €80–230 more at current exchange rates. The UK regulatory framework for plug-in solar is also still in transition, with the BSI product certification standard not expected to be finalised until mid-2026. Buy the kit in France. It arrives certified to the correct standard, at a lower price, and the CACSI process is straightforward from day one.