Greece opens the door to balcony solar

The short answer

Greece is finally giving balcony solar a clear path. The energy ministry has opened public consultation on a concrete framework that allows small plug-in systems up to 800W, with no permit and no connection fee. It is the biggest step so far — and until it is published in the Gazette (the consultation closes on 20 July 2026), the details can still be adjusted.

If this is the first time you've heard the term, don't worry — below we explain everything from scratch: what balcony solar actually is, why it sat in a grey zone in Greece until now, what changes, what you gain, and what it takes to set one up properly.

What is balcony solar?

It's a small solar system — usually one or two panels — that mounts on your railing, facade, or a stand on the balcony, with the active side facing the sun. The panels connect to a small device called an inverter, which converts the solar power into ordinary household electricity. From there, a cable runs to a normal wall socket.

The result is simple: whenever the sun is out, the system feeds electricity into your home. The appliances running at that moment — fridge, router, standby devices, air conditioning — draw from the solar first, and only pull whatever's missing from the grid. That cuts the power you buy, with no rooftop, no major project, and no changes to your home's wiring. This is why they're also called "plug-in" systems.

Why it was hard until now

In countries like Germany, balcony solar has been everyday for years: you buy it, hang it, and register it online. In Greece, though, there was no clear rule specifically for these tiny systems. The law was written for larger rooftop installations, with permits, studies and a connection agreement — far too heavy a process for an 800W system.

That left out exactly the people who would benefit most: the millions of households in apartment blocks and the tenants who don't have their own rooftop. The new framework closes that gap by recognising balcony systems as a distinct, legal category with a much simpler process.

Why it matters for you

In Athens, where the vast majority live in apartments, this is the difference between "not possible" and "possible in a few simple steps." You don't need to own a house, and you don't need to take on a project worth tens of thousands of euros. A small balcony system gives you a slice of energy independence at a reasonable cost.

What you gain as a consumer

• A lower bill. The system covers part of your home's use during sunny hours, so you buy less power from your supplier. The more electricity you use during the day, the bigger the benefit.
• No permit, no fee. In the general case there is no building permit, no connection agreement, and no connection fee with DEDDIE — the things that make big projects slow and expensive.
• A simple, digital process. Instead of conventional licensing, you file a notification through a DEDDIE Digital Gateway, logging in with your TAXISnet credentials.
• Great for tenants too. Because the system plugs into a socket and is installed reversibly, you can usually unmount it and take it with you if you move.
• Battery option. The same framework also opens the door to standalone batteries, so you can store the day's energy and use it in the evening instead of losing it.

What you can realistically expect

A balcony system is small, so it won't zero out your bill — it targets your home's steady daytime load. The real saving depends on how your balcony faces, shading from nearby buildings, and how much power you use while the sun is up.

That's why we don't quote a "magic" number. Instead, you can put your own details into the payback calculator and see a realistic estimate for your case before making any decision.

What the conditions are

Simple does not mean "no rules." The rules exist mainly for safety — yours and the grid's. To keep the installation legal and safe, the draft asks for:

• Power limits: up to 800W injection power (what the system delivers at any moment) and up to 900W total installed capacity per supply point.
• Pure self-consumption: the energy is for your own use. You don't sell surplus to the grid — you simply buy less.
• Notification to DEDDIE: via the Digital Gateway, at least 5 days before installation.
• Installer's Declaration of Responsibility: a document signed by a licensed electrician and renewed every two years. In practice, it means you need a professional in the loop.
• Safety hardware: a directional sensor that stops power flowing back into the grid, telemetry / a smart meter to record production and consumption, and anti-islanding protection that automatically disconnects the system during a blackout.
• Special areas: stricter terms in Natura 2000 zones, listed buildings and traditional settlements. And note: the state simplifies licensing, but your building's own rules on the facade still apply.

How the process works, step by step

Without the jargon, the flow the draft describes looks roughly like this:

1. You choose a system and give your supplier or installer your supply-point details.
2. You file the notification with DEDDIE through the Digital Gateway, at least 5 days ahead.
3. A licensed electrician installs the system and signs the Declaration of Responsibility.
4. The correct metering and safety hardware goes in.
5. The system runs and starts cutting your bill — DEDDIE may carry out random inspections.

How Sunrail helps

The two conditions that add time and cost — the licensed electrician and the smart meter — are exactly the parts we handle, so you don't have to chase them. We review your balcony (orientation, shading, mounting), take care of the DEDDIE notification and the metering, and hand you a system that is ready and compliant with the framework. You just see the result on your bill.