For most businesses considering solar, the starting point is straightforward - reduce electricity costs.
But it doesn’t take long before another question comes up. What happens to the electricity you don’t use?
On a sunny day, many commercial buildings will generate more electricity than they need at certain times. Offices may be partially occupied, machinery may not be running at full capacity, or weekends may see lower demand altogether.
So can that excess electricity be sold back to the grid?
The short answer is yes - but how it works (and how much value it delivers) is worth understanding properly.
Yes, businesses in Ireland can export surplus solar electricity back to the grid.
This is done through what’s known as a microgeneration or small-scale generation export arrangement, depending on the size of the system.
When your solar panels generate more electricity than your business is using at that moment, the excess can be sent back into the national grid - and you can receive payment for it.
Export payments are typically made by electricity suppliers for each unit of electricity (kWh) sent back to the grid.
The rate varies depending on the supplier and contract, but the key idea is simple:
These payments are often referred to as Clean Export Guarantee (CEG) payments in Ireland.
This is one of the most common questions, and the answer depends on several factors, including the size of the solar system, how much electricity your business uses during the day, the export rate offered by your supplier and how much surplus energy is generated.
In addition to export payments, businesses may also be eligible for SEAI supports for commercial solar, which can cover a portion of installation costs and improve overall payback.
In most commercial setups, however, systems are designed so that the majority of electricity is used on-site rather than exported.
That’s because the biggest financial benefit comes from avoiding the cost of buying electricity, not selling it.
It might seem counterintuitive, but the most valuable solar electricity is the electricity you use yourself.
For example:
In practice, commercial solar systems are designed around how a business actually uses electricity day to day. By aligning generation with energy demand, it’s possible to maximise on-site usage while still benefiting from export where surplus arises.
Export capability is useful, but solar works best for businesses that can use a high proportion of the electricity they generate.
These typically include manufacturing facilities, warehouses and logistics centres, retail units and office buildings with consistent daytime demand.
In these environments, solar can offset a large portion of electricity usage while still providing export value when excess generation occurs.
There are some technical and regulatory considerations when exporting electricity to the grid.
These can include grid connection requirements, system size thresholds and export capacity limits set by network operators.
In most cases, these factors are assessed during the design and approval stage of a project. An experienced installer will take them into account to ensure the system operates efficiently and in line with grid requirements.
Solar can generate income through export payments, but it’s more accurate to view it as a cost reduction strategy with an added revenue element.
For most businesses, the primary benefit of solar is reducing electricity spend, with export payments providing additional value and long-term price stability supporting more predictable financial planning.
In some cases - particularly where there is excess roof space and lower on-site usage - export can play a more meaningful role, but it rarely replaces the core benefit of reducing energy costs.
If you’re considering solar, understanding how your business uses electricity is the key starting point.
Activ8 Solar Energies works with commercial clients across Ireland - from manufacturing and logistics to pharmaceutical and food production - designing solar systems based on real energy usage, site potential and long-term performance.
For businesses looking to avoid upfront investment, solar can also be delivered through Power Purchase Agreement (PPA) models, allowing electricity to be purchased at a fixed rate over time.
By assessing energy demand, roof space and grid connection, it’s possible to design a solar solution that reduces costs and generates long-term value - with export payments forming part of the overall return.
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