Solar Panels for Supermarkets in Ireland
Supermarkets are one of the strongest cases for commercial solar in Ireland. Refrigeration runs around the clock, the lights and HVAC stay on through long trading hours, and the bakery and deli add steady daytime demand. That gives a high, constant base load that solar self-consumption covers almost entirely, and a large flat roof over the store gives plenty of space to size to it. Compare quotes from installers who work on retail and grocery premises.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Quick Answer
Most Irish supermarkets install 30-250 kWp of rooftop solar, sized to refrigeration and lighting loads. Because chillers and freezers run 24/7, self-consumption is very high, often 85-95%. A 100 kWp system costs roughly €80,000-€100,000 before grant, qualifies for the SEAI Non-Domestic Microgen grant plus Accelerated Capital Allowance, and typically pays back in 4-6 years.
Why solar suits supermarkets
A supermarket has the two things that make solar PV work well: a big, constant electrical load and a large flat roof to put panels on. Refrigeration is the single largest load, and chillers and freezers run continuously, day and night, summer and winter. Lighting, HVAC, checkouts, the bakery ovens and the deli counters all add to a base demand that barely dips during trading hours. That steady daytime draw means almost everything the array generates is consumed on site rather than exported, and self-consumption is where the money is.
The load profile is the key. A grocery store shows a high flat base load from refrigeration overnight, then a daytime rise as lights, ovens and air handling come on for trading. Solar lines up with the daytime portion of that curve directly, and the refrigeration base load underneath it soaks up generation even on dull days. There is rarely a midday surplus to export because the store is using the power as fast as the panels make it.
Roof space is rarely the constraint. A modern supermarket or superstore sits under a large, flat, unshaded roof, ideal for a ballasted mounting system tilted to the optimal angle without drilling the membrane. That means you can size the system to the load rather than to the available area. For the wider picture across shops and stores, see our retail solar guide.
Refrigeration
Chillers and freezers are the biggest load and run 24/7, the most constant demand of any commercial building type.
Lighting & HVAC
Long trading hours keep lights and air handling on through the day, a steady load solar covers well.
Bakery & deli
Ovens, hot counters and food prep add daytime demand that lines up neatly with peak generation.
What size solar system does a supermarket need?
Most Irish grocery premises install between 30 and 250 kWp, and the right size is driven by store format and refrigeration load rather than by roof area, which is usually generous. A convenience store with a handful of chillers needs far less than a full superstore with banks of freezers, a bakery and a deli. The best approach is to size to the refrigeration and lighting base load using a year of half-hourly meter data, so the array is mostly self-consumed under the Non-Domestic Microgen Grant.
| Store Format | Typical System | Panels (approx.) | Annual Generation | Best Grant Route |
|---|---|---|---|---|
| Convenience store | 30–50 kWp | 69–115 | ~26,000–43,000 kWh | NDMG |
| Supermarket | 50–120 kWp | 115–276 | ~43,000–103,000 kWh | NDMG |
| Large supermarket | 120–200 kWp | 276–460 | ~103,000–172,000 kWh | NDMG |
| Superstore | 200–250 kWp | 460–575 | ~172,000–215,000 kWh | NDMG |
Generation assumes the average Irish yield of around 860 kWh per kWp per year. Actual figures depend on roof orientation, shading and tilt. A site survey and a year of meter data give the accurate sizing, oversizing past your base load just pushes more cheap export rather than displacing import.
Supermarket solar grants, ACA and payback
For supermarkets the grant is the SEAI Non-Domestic Microgeneration Grant (NDMG), not the agricultural TAMS scheme. The NDMG supports commercial rooftop solar up to a maximum of €162,600 on large systems, and it stacks with the Clean Export Guarantee for any surplus you do export. Because a supermarket consumes nearly all of its generation, the export tariff is a minor part of the return.
On top of the grant, a supermarket trading as a company can claim the Accelerated Capital Allowance (ACA), writing off 100% of the qualifying solar cost against profits in year one through the SEAI Triple-E register. Between the NDMG and the ACA, the net cost after tax relief falls well below the headline figure.
| System | Gross Cost (est.) | Grant Route | Net Cost (est.) | Payback |
|---|---|---|---|---|
| 50 kWp | €40,000–€55,000 | NDMG (€12,000) | €28,000–€43,000 | 4–6 years |
| 100 kWp | €80,000–€100,000 | NDMG (€22,000) | €58,000–€78,000 | 4–6 years |
| 150 kWp | €115,000–€150,000 | NDMG (€32,000) | €83,000–€118,000 | 5–7 years |
| 250 kWp | €190,000–€240,000 | NDMG (€52,000) | €138,000–€188,000 | 5–7 years |
Installed cost runs roughly €800–€950 per kWp at this scale, with smaller systems at the higher end per kWp. Figures are estimates for 2026 and exclude battery storage, which is not covered by NDMG.
Accelerated Capital Allowance
Supermarkets trading as a company can claim the Accelerated Capital Allowance (ACA), writing off 100% of qualifying solar cost against profits in year one through the Triple-E register. This brings the effective net cost down further on top of the NDMG grant.
Where the savings come from
Commercial electricity costs around 22c/kWh to import while exported surplus earns roughly 18c/kWh, so displacing your own refrigeration and lighting load is worth more than exporting. Supermarkets reach 85–95% self-consumption thanks to the 24/7 chiller base load, which is why the returns are strong, typically a 12–18% annual return.
Roof, planning and install specifics for supermarkets
The practical details on a supermarket differ from an office or a farm. Plan for these before you commit to a system size.
| Factor | What to check on a supermarket |
|---|---|
| Roof structure | Large-span flat roofs use ballasted, non-penetrating mounts; an installer should confirm the deck carries the ballast and panel load and that the membrane warranty is preserved. |
| Planning | Rooftop solar on commercial buildings is largely planning-exempt in Ireland, though limits on visibility and proximity to boundaries can apply; your installer should confirm the exemption for your site. |
| Load matching | Refrigeration runs constantly, so the array is sized to the daytime base load to keep self-consumption high without needing storage to make the numbers work. |
| Grid connection | ESB Networks NC6 covers smaller systems and NC7 covers larger ones up to 200kW; inverters must meet EN 50549. |
| Rooftop plant | Condensers, air-handling units and ducting take up roof area and cast shade; the layout must work around existing refrigeration and HVAC plant. |
Do supermarkets need a battery?
Usually not for the core business case. Because refrigeration provides a constant base load day and night, a supermarket self-consumes most of its generation without storage, so the array pays back on displaced import alone. A battery can add value for peak-demand shaving or backup of critical refrigeration, but it is an add-on to the case rather than the thing that makes it work.
Supermarket Solar FAQ
How big a solar system does a supermarket need?
Most Irish supermarkets install 30-250 kWp, sized to refrigeration and lighting load rather than roof area. A convenience store typically needs 30-50 kWp, a standard supermarket 50-120 kWp, and a large superstore 200-250 kWp. Sizing should be matched to your base load using a year of half-hourly meter data so the array is mostly self-consumed.
What grant can a supermarket get for solar panels?
Supermarkets use the SEAI Non-Domestic Microgeneration Grant (NDMG), which supports commercial rooftop solar up to a maximum of €162,600 on large systems. On top of the grant, a supermarket trading as a company can claim the Accelerated Capital Allowance (ACA) to write off 100% of qualifying cost against profits in year one. The agricultural TAMS scheme does not apply to retail premises.
Does supermarket solar need planning permission?
Rooftop solar on commercial buildings is largely planning-exempt in Ireland, which covers most supermarket installs. Limits can apply on visibility, height above the roof and proximity to boundaries, and ground-mounted systems may need permission. Your installer should confirm the exemption applies to your specific building before you commit.
Will solar cover the refrigeration load?
Solar covers the daytime portion of the refrigeration and lighting load directly, and because chillers and freezers run 24/7 they soak up generation even on dull days. Supermarkets typically reach 85-95% self-consumption, which is among the highest of any building type, so most of what the panels make is used on site rather than exported.
What is the payback on solar panels for a supermarket?
A 100 kWp system costs roughly €80,000-€100,000 before grant and falls to about €58,000-€78,000 after the NDMG grant, with further relief from the ACA, giving a payback of about 4-6 years. Larger systems pay back in 5-7 years. Payback is driven by self-consumption, since displacing import at about 22c/kWh is worth more than exporting surplus at about 18c/kWh.
Related Guides
Commercial Solar
Solar panels for Irish businesses: costs, NDMG grants, and ROI.
Solar for Shops & Retail
Retail solar PV: refrigeration load, sizing, grants, payback.
Solar for Cold Storage
Cold store solar: 24/7 refrigeration load, NDMG grant, ROI.
Solar for Warehouses
Warehouse solar PV: sizing, NDMG grant, and ROI in Ireland.
Sources
- SEAI, Non-Domestic Microgen Scheme (NDMG)
- SEAI, Accelerated Capital Allowance
- ESB Networks, Micro and Small-Scale Generation
Last updated: July 2026
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.
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