Here’s the uncomfortable truth: Irish businesses are leaving six- and seven-figure sums on the table every year by not putting solar PV on their roofs. Despite policy tailwinds, strong grants and some of Europe’s highest business electricity costs, the commercial rooftop market still lags Ireland’s potential.
That gap isn’t just a climate miss — it’s a cash leak.
Ireland’s electricity costs for business averaged about €0.23 per kWh in the second half of 2024 (ex-VAT weighted price). Even after the worst of the energy crisis, this remains well above the Euro Area average — and every self-generated kWh a company consumes is a kWh it doesn’t have to buy at that price.
At the same time, the policy environment is about as friendly as it has ever been. Since October 2022, rooftop solar on industrial and commercial buildings is generally exempt from planning permission constraints (with sensible safeguards around airports and helipads). In most of the country you can cover the entire roof; in “solar safeguarding zones” there are generous area limits. That reform removed a major non-financial barrier to rollout.
Grants are strong too. The SEAI Non-Domestic Microgen Scheme (NDMS) supports systems up to 1 MWp with a tiered grant that can reach €162,600 per site—€300/kWp from 7–20 kWp, €200/kWp from 21–200 kWp, and €150/kWp from 201–1,000 kWp. For many projects, the grant trims years off the payback.
And the physics cooperate: Ireland’s irradiance is better than its reputation, in truth we are in a similar position to southern England and most of northern Europe.
Typical commercial rooftops can expect roughly 850–950 kWh of output per installed kWp per year depending on location and tilt. SEAI’s business solar PV guide uses ~870 kWh/kWp in worked examples, and reputable installers quote national averages close to 880–900 kWh/kWp. In short: 1 kWp ≈ ~0.9 MWh per year.
So why talk about a “lack” of commercial PV? Because the mix of Ireland’s solar boom is skewed. Utility-scale solar has surged, and small-scale household systems have proliferated. Ireland passed ~1.7 GW of cumulative installed PV by mid-2025, but a relatively modest share of that sits on the rooftops of factories, warehouses, hospitals, hotels and offices — the places that consume power during the day, right when PV produces it. Put differently: the nation is progressing, but the commercial rooftop segment is still under-realised relative to its size and load profile.
How much are you throwing away on Foreign Energy Imports?
That under-adoption is expensive. The reality of the interconnected electricity market is you are quite likely to be spending the cash on imported foreign energy. Here’s what typical companies are missing out on every year by not installing solar, using conservative assumptions:
- Hotel or 24/7 site (150 kWp): ~135,000 kWh/year. If 85% is used on-site, that’s 114,750 kWh × €0.23 ≈ €26,393 in avoided purchases, plus 20,250 kWh exported at ~€0.18 ≈ €3,645. That’s ~€30,000 per year. Delay a year? You’ve effectively paid an extra €30,000 to your supplier for energy you could have produced. That’s income you should be directing elsewhere.
- Distribution warehouse or light manufacturing (500 kWp): ~450,000 kWh/year. With 75% self-consumption, 337,500 kWh × €0.23 ≈ €77,625 saved, plus 112,500 kWh × €0.18 ≈ €20,250 in export revenue. Call it ~€98,000 per year.
- Large energy user with good daytime load (1 MWp): ~900,000 kWh/year. With 80% self-consumption, 720,000 kWh × €0.23 ≈ €165,600 saved, plus 180,000 kWh × €0.18 ≈ €32,400. Roughly €198,000 per year.
Those numbers are deliberately cautious. Many commercial sites push self-consumption above 90% with basic controls (staggered processes, chilled-water pre-cooling, EV/FLT charging during peak sun, simple HVAC scheduling). They also exclude additional value like reduced network capacity charges that can follow a lower import profile, and they treat export revenue at conservative levels even though some suppliers pay ~€0.20–€0.25/kWh at certain times.
Stack grants on top, and the economics strengthen further. A 500 kWp system qualifies for ~€83,000 in NDMS support (the first 20 kWp at €300/kWp, the next 180 kWp at €200/kWp, the next 300 kWp at €150/kWp), cutting capital outlay and shortening payback. Many Irish SMEs now see simple paybacks between 4–7 years depending on capex and load match; energy-intensive LEUs can be faster, particularly where roofs are expansive and daytime demand is steady.
So what’s been holding companies back? Historically: planning friction (now largely fixed), uncertainty around export remuneration (the CRU’s enduring Clean Export Guarantee arrangements provide clarity), grid connection paperwork (micro/mini-gen NC6/NC7 is straightforward for systems up to 50 kW export), and capex hesitancy during market volatility. All are solvable, and most are already improved.
Ignoring Solar PV is a Compound Error
The opportunity cost is not only annual cash. It compounds. Every year without PV is a year without hedged daytime kWh. It’s another 3–5% of your total electricity bill that could have been permanently shaved with no operational downside. For multi-site portfolios, the missed savings aggregate to board-level materiality: tens of thousands per site becomes millions across a footprint over a decade. In an era where regulated network charges are trending upward to fund grid upgrades and new renewables connections, “self-generation as a hedge” is an operational strategy, not a nice-to-have.
Even for firms worried about exporting: modern supplier tariffs pay for measured exports, and if you prefer to maximise self-use, a modest battery or process-timing tweaks can push your on-site utilisation into the 85–95% range. Export rates float by supplier and can change, but they’re a bonus, not the business case. The business case is the avoided purchase of expensive daytime electricity at ~€0.23/kWh — right where solar is strongest.
Ireland’s macro picture underscores the urgency. Rooftop microgeneration connections have exploded past 120,000 — mostly homes — while industry still sits on acres of unutilised roof real estate, especially in logistics, pharma, food, retail, and healthcare. Shifting just a slice of that load behind-the-meter reduces system-wide demand, eases pressure on a constrained grid, and gives CFOs a dependable, inflation-proofed energy tranche for 25 years.
The takeaway is simple: if your business has a roof and a daytime load, the status quo is costing you real money every single month. Use the planning exemptions. Claim the NDMG grant. Get a quick desktop assessment (yield, self-consumption, grant value, simple payback) and treat PV as you would any high-ROI operational investment. The sooner Irish companies normalise rooftop solar as standard plant, the sooner we stop haemorrhaging cash to imports — and the sooner those savings can be redirected into hiring, equipment, growth and profit.
Contact Solar Now TODAY to get started.
Solar Now (c) All Rights Reserved