Grid connection for home renewable energy

Connecting your home renewable energy system, such as solar panels or a wind turbine, to the National Grid is a crucial step for UK homeowners. It allows you to export any surplus electricity you generate and ensures your system operates safely and in compliance with regulations. This guide demystifies the process, outlining the key players, regulations, and steps involved to help you take control of your home's energy future.

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Understanding grid connection for home energy systems

What is the National Grid?

The National Grid is the high-voltage electricity transmission network that transports power across Great Britain, from power stations to local distribution networks. These local networks, operated by Distribution Network Operators (DNOs), then deliver electricity to homes. Think of the National Grid as the motorways of electricity, and the DNO networks as the smaller roads that reach your street.

Why connect your home renewables?

Connecting your home renewable system to the grid offers several benefits. Firstly, it allows you to export any electricity your system generates but your home doesn't immediately use. This surplus energy can then be used by other homes, contributing to a greener energy supply. Secondly, grid connection ensures the safe operation of your system, preventing issues like 'islanding' - where a local generator continues to power a section of the grid during a power cut, posing a risk to engineers. Finally, a proper grid connection is often a prerequisite for receiving payments for the electricity you export.

Key players and regulations: DNOs, G98, and G99

Navigating grid connection involves understanding the roles of several key organisations and specific technical regulations.

Your distribution network operator (DNO)

Your DNO is the company responsible for the electricity cables, poles, and substations that bring power to your home. They maintain the local network and are distinct from your energy supplier, which is the company you pay for your electricity. There are six DNO groups operating across 14 licence areas in Great Britain, plus NIE Networks in Northern Ireland.

You can find your specific DNO by entering your postcode on the Energy Networks Association (ENA) website or by calling 105, the free power cut emergency number. Your DNO's details are also typically found on your electricity bill.

G98 vs G99: which applies to you?

The connection of small-scale generation to the electricity grid is governed by Engineering Recommendations (EREC) G98 and G99, published by the ENA. These regulations ensure that your system can connect safely and without negatively impacting the wider network.

• G98: This applies to smaller generation systems, typically those with a total output of up to 16amps per phase (around 3.68 kW AC for a single-phase supply). Most domestic plug-in solar systems fall under G98. For G98 installations, you or your installer must notify your DNO within 28 days of commissioning the system. This is a notification, not an application, meaning you don't need prior approval from the DNO for compliant systems.
• G99: This regulation applies to larger generation systems, or those that exceed the G98 limits (e.g., above 3.68 kW AC for a single-phase supply). For G99 connections, you must apply to your DNO and receive approval before installing your system. The G99 process is more detailed and can take longer, as the DNO may need to assess the impact on the local network.

The role of Ofgem

Ofgem, the Office of Gas and Electricity Markets, is the UK's energy regulator for Great Britain. Its primary role is to protect the interests of energy consumers by regulating energy markets, ensuring fair practices, and promoting a secure, sustainable, and affordable energy system. Ofgem oversees schemes like the Smart Export Guarantee (SEG) and sets the rules that energy companies must follow.

Connecting home renewable systems: a step-by-step guide

The process of connecting your home renewable system to the grid can be broken down into several key stages:

Initial assessment and planning

Before anything else, understand your home's energy generation and export capabilities. Consider the type and size of your renewable system (e.g., solar panels, small wind turbine) and how much electricity it's likely to produce. This initial assessment will help determine which grid connection regulation (G98 or G99) applies to your setup.

Notifying your DNO

Once your system is installed and commissioned, or if it's a larger system requiring prior approval, you must interact with your DNO. For G98-compliant systems, such as most plug-in solar units, you or your supplier must notify the DNO within 28 days of installation. This notification includes details about your system, such as the inverter make and model, and its rated AC output. For G99 systems, you'll need to submit a more detailed application and await approval before installation.

Installation and commissioning

For systems requiring professional installation (e.g., rooftop solar), your installer will handle the physical setup and commissioning. They should ensure the system meets all relevant safety standards and technical requirements. For compliant plug-in solar, self-installation is permitted.

Plug-in solar: simplified connection rules

Plug-in solar systems have gained popularity due to their simplicity and accessibility. Recent legislation has streamlined their connection to the grid.

The SI 2026/848 exemption

Since 27 August 2026, Statutory Instrument (SI) 2026/848 has applied to compliant plug-in solar devices, amending the Plugs and Sockets etc. (Safety) Regulations 1994. This legislation provides a narrow exemption, allowing these devices to legally connect via a standard BS 1363 plug.

Key details of this exemption include:

• Output cap: A limit of 800W AC export per device.
• Units per property: Currently, only one plug-in solar unit is permitted per property.
• Installation: Self-installation is allowed, with no mandatory electrician or inspection required.
• Compliance: The device must comply with an Interim Product Specification and declare this compliance.

G98 notification for plug-in solar

Even with the simplified rules under SI 2026/848, notification to your DNO is still mandatory. The consumer or their supplier must notify the DNO under G98 within 28 days of the plug-in solar system's installation. This ensures the DNO is aware of all generation connected to their network.

What about plug-in batteries?

It is important to note that SI 2026/848 applies specifically to compliant standalone plug-in solar systems. It does not cover plug-in batteries or hybrid solar-battery systems. These types of systems are outside the scope of the current simplified connection rules.

Exporting your energy and tariffs

Once your renewable system is connected to the grid, you can explore options for exporting any excess electricity you generate.

Smart Export Guarantee (SEG)

The SEG is a UK government scheme that requires larger energy suppliers (those with over 150,000 domestic electricity customers) to offer tariffs to pay small-scale generators for the renewable electricity they export to the grid.

To be eligible for an SEG tariff, your installation typically needs to be certified under the Microgeneration Certification Scheme (MCS) or an equivalent standard, and you usually need a smart meter capable of providing half-hourly export readings.

Plug-in solar systems, especially self-installed units, typically do not qualify for the SEG because they often lack the required MCS certification.

Beyond SEG: other export opportunities

Even if your system doesn't qualify for the SEG, unused generation is not necessarily unpaid. Energy suppliers can still offer their own export tariffs outside the SEG scheme. It's worth checking with your supplier to see what options they provide for exporting your surplus energy.

Maximising self-consumption

For many homeowners with renewable energy systems, the biggest savings come from maximising self-consumption - using the electricity you generate directly in your home rather than exporting it. This reduces the amount of electricity you need to buy from the grid. For plug-in solar, this means running appliances during daylight hours when your panels are generating power. The average UK home uses around 2,500 kWh of electricity per year, so offsetting this usage directly can lead to significant savings.

Future-proofing your home energy

Connecting your home renewable energy system to the National Grid is an empowering step towards greater energy control and independence. It allows you to contribute to a more sustainable energy system while potentially reducing your energy bills. Understanding the regulations and processes involved ensures a smooth and compliant connection, paving the way for a future with more abundant and self-generated energy.

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