Your electricity meter runs even when the sun is shining on your roof. All the electricity you consume comes from the grid, and every kilowatt-hour is billed at the current rate. Installing photovoltaic solar panels allows you to produce some of this electricity at home, directly from your roof. The principle is simple: every kilowatt-hour you produce and consume is one less kilowatt-hour you have to buy.
Solar Regulation 2026: What Changes for Small Installations
Before sizing a project, it is essential to know the current regulatory framework. Since the decree of June 1, 2026, published in the Official Journal on June 4, 2026, the self-consumption bonus has been removed for new applications submitted from June 5, 2026. Applications submitted before this date retain the previous conditions, subject to eligibility.
This removal changes the profitability calculation. Until now, the bonus paid over several years reduced the net cost of the installation. Without it, the return on investment relies more on actual consumption savings.
Another major change: total sale is no longer available for installations under 9 kWc. For the vast majority of residential roofs, the only available scheme is self-consumption with possible resale of surplus. In other words, you consume what you produce, and the rest goes to the grid at a buyback rate that has significantly decreased in recent months.
Moreover, the reduced VAT rate of 5.5% remains accessible, but it is now subject to specific technical and environmental conditions since October 1, 2025. Check with your installer that your project meets these criteria before signing a quote.
Installers like those listed on need-sun.fr assist individuals in assembling the file and verifying these new regulatory conditions.
Solar Self-Consumption: Understanding What You Really Save
Have you noticed that your electricity consumption varies greatly depending on the time of day? The washing machine runs in the morning, the oven heats in the evening, and the water heater kicks in at night. Solar panels, on the other hand, produce during the day, peaking around noon.
The actual savings depend on the self-consumption rate: the portion of your production that you use directly. The more you consume during sunny hours, the less you buy from the grid.
Specifically, here are the levers that increase this rate:
- Shift energy-intensive appliances (washing machine, dishwasher, water heater) to the 10 AM – 4 PM time slot, either manually or through a timer.
- Install a solar router that automatically redirects surplus to the water heater instead of sending it to the grid.
- Add a home storage battery to keep the energy produced during the day and use it in the evening when production stops.
Without a battery, a typical household self-consumes between one-third and half of its production. With a properly sized battery, this share increases significantly, but the cost of the battery extends the payback period.
Why Selling Surplus is No Longer Enough
The compensation for surplus injected into the grid has significantly decreased for new projects submitted after June 2026. Each self-consumed kilowatt-hour is now worth much more than a kilowatt-hour sold. This reality encourages increasing direct consumption rather than oversizing the installation in hopes of selling a lot.
A well-calibrated system covers your daytime needs without producing a massive surplus that you would sell at a relative loss.
Sizing Your Photovoltaic Installation According to Your Actual Consumption
The temptation is strong to install the maximum number of panels on the roof. In practice, an oversized installation wastes capital because the surplus sold generates little income.
To properly size your system, start with your annual electricity bill. Identify your consumption in kilowatt-hours, then determine the portion consumed during the day. It is this portion that your panels can directly replace.
Orientation, Tilt, and Solar Shading
A panel facing due south with a tilt close to 30 degrees produces the maximum energy in mainland France. A southeast or southwest orientation remains effective, with moderate production loss.
Solar shading (chimneys, trees, neighboring buildings) can reduce production in ways that are sometimes underestimated. A partial shadow on a single panel can affect the performance of the entire system if the installation does not use micro-inverters.
- Have a shading study conducted before any quote. A winter survey (low sun) reveals the most penalizing shades.
- Prefer micro-inverters or power optimizers if your roof has areas of partial shade.
- Check the usable surface available: a typical residential installation occupies between fifteen and thirty square meters of roof.
Electricity Bill After Solar Panels: What to Expect
You will still receive a bill. The network subscription remains due, and nighttime or poor weather consumption continues to be billed normally. Solar panels reduce the variable part of the bill, not the total.
The reduction observed on the bill depends on several factors: the installed power, the self-consumption rate, the sunlight in your region, and your consumption habits. Households that adapt their usage to production hours see the most significant reduction.
A often overlooked point: regular maintenance of the panels preserves their efficiency over time. An annual cleaning and a check of the inverter every few years are sufficient in most cases.
The continuous rise in grid electricity rates also favors solar energy. Each tariff increase mechanically improves the profitability of your installation, as the kilowatt-hour you do not pay increases in value each year.
With the removal of the self-consumption bonus and the decrease in the buyback rate, residential solar in 2026 relies on a more straightforward calculation: produce what you consume, at the right time, with an installation that is neither too small nor too large. The framework has changed, but the economic interest remains concrete for households that size their project according to their actual needs.
