Explaining the enhanced commercial solar grant

Costing solar for 2027

As businesses set out their 2027 budgets, SEAI’s enhanced solar grant is a good reason to revisit a parked Solar PV project. The headline is generous. But the figure that belongs in a budget is not the headline, and the timeline is actually tighter than the closing date suggests.

This article sets out what the grant is actually worth, what it does to payback under cautious assumptions, and what must happen, in what order, to secure it.

The enhanced grant is described as 45% support. For most competitively priced projects, it is 45% of a number you won’t know until the final invoice. And the deadline that actually matters arrives well before 6 July 2027.

What has changed?

From 6 October 2026 to 6 July 2027, SEAI has raised support under the Non-Domestic Microgen Grant to an effective 45% of eligible solar installation costs, as an action of the National Energy Affordability Taskforce. The maximum grant is €325,200, covering systems up to 1,000 kWp.

The enhanced rate applies only to new applications made from 6 October 2026. Existing offers are not uplifted, and works already started proceed on their original offer. Standard offer expiry and cancellation terms continue to apply, so anyone holding an unstarted offer should confirm their position with SEAI before deciding how to proceed.

Two numbers determine the payment. SEAI first calculates a grant offer from system-size bands. Once complete, it pays the lower of that offer and 45% of the final eligible invoice.

That matters because competitively priced projects often cost less than the benchmark built into the bands. When they do, the 45% invoice cap sets the payment, and a lower final invoice means a lower grant. Budget on the expected payment, not the offer letter.

What the grant is actually worth?

Take two illustrative projects: 100 kWp at €1,000 per kWp and 400 kWp at €800 per kWp, reflecting typical economies of scale. Both assume the quoted price is the final eligible invoice and that VAT is recoverable. Real pricing depends on the roof, electrical works and connection requirements.

In both cases, the invoice cap, not the offer, sets the payment. On the 400 kWp project, net investment falls from €247,400 to €176,000, a reduction of about 29% against the standard grant. If the final invoice came in at €300,000, the grant would fall to €135,000 and net investment to €165,000. The business still benefits from the keener price but receives a smaller grant.

The panels generate the same electricity either way. The grant improves the return by reducing the capital at risk.

What it does to payback?

Payback depends on four inputs: generation, how much is used on site, the value of each kWh avoided, and what exported power earns. The table shows a base case and a deliberately cautious one.

Base case: 900 kWh/kWp a year, valued at an avoided rate of €0.28/kWh for power used on site and €0.12/kWh for exports. The 100 kWp system uses 90% of its output on site and the 400 kWp system 85%, reflecting that a smaller system relative to site load self-consumes more.

Conservative case: 850 kWh/kWp, 75% used on site at €0.22/kWh and 25% exported at €0.10/kWh, for both sizes. Both cases deduct an annual operating allowance of €1,500 and €4,000 respectively.

Two points stand out. Even on cautious inputs, both projects pay back in around four years or less. And the grant does most of the work on the weaker case: it takes about 1.5 years off the conservative 100 kWp project against 1.0 year in the base case. The enhanced grant matters most for projects that narrowly missed the investment hurdle last time.

On electricity prices, CSO figures show wholesale electricity in August 2026 was about 77% dearer than a year earlier, though still well below the 2022 peak. That supports the value of self-generation, but it should be treated as upside rather than built into the base case. Only part of a business tariff tracks wholesale prices, and solar avoids unit charges, not standing or capacity charges. As a guide, every 1c/kWh change in the avoided rate moves the base-case annual benefit by about €810 at 100 kWp and €3,060 at 400 kWp. Apply your own tariff rather than ours.

Simple payback excludes financing, tax, panel degradation and equipment replacement. Savings are pre-tax: they raise taxable profit. A full appraisal should include those factors.

Pinergy’s Commercial Solar Energy Consultants

Price security in volatile times

Payback is only part of the case. Once installed, solar fixes the cost of a share of a site’s electricity for the life of the system. Panels typically carry performance warranties of 25 years or more, so a business is buying decades of generation at a cost largely set on the day it signs.

That matters in a market that has proved volatile. Wholesale prices have risen sharply this year, as they did in 2022, and no business can hedge its full tariff for twenty years. Every kWh generated on site is a kWh that no longer moves with gas prices, network tariff reviews or supplier contract renewals.

It also strengthens the business’s position in other ways: lower, more predictable operating costs for budgeting, lowered exposure to price shocks, and measurable progress on the carbon reporting that customers, lenders and tenants increasingly ask about.

One point of precision: a standard grid-connected system switches off during a network outage for safety reasons. Solar’s resilience is economic, not backup power. Where continuity of supply matters, assess batteries and the right switching arrangements alongside the solar design.

The real deadline is earlier than 6 July

SEAI requires the business to choose its installer and agree a formal contract before applying. So, 6 July 2027 is effectively a contract-signing deadline. Design, pricing and internal approval must be complete before then.

Once issued, a grant offer is valid for eight months. Works cannot start before the offer arrives, and the grid connection process usually runs inside that window. Sequence the grid application early so it does not consume the clock.

Grid timing depends on size. For inverter-connected systems between roughly 50 kVA and 200 kVA, ESB Networks currently indicates an average of eight to ten weeks from paying the application fee to receiving a connection offer, longer for complex sites. That fits the 100 kWp example. A 400 kWp system will normally exceed 200 kVA and fall into a different connection process, with longer and less predictable timelines. Acceptance, any network works and ESB Networks witness testing still follow the offer.

Installed generation capacity also cannot exceed the site’s Maximum Import Capacity (MIC). Sites with a low MIC may need to address that before the solar project can proceed. Roof surveys, landlord consent and planning checks add further time.

Not ready by July? The standard grant still stands

The enhanced rate is a time-limited boost, not the whole scheme. The Non-Domestic Microgen Grant has supported business solar at its standard rates for several years, and those rates remain the scheme’s baseline. Existing offers also remain valid on their original terms.

The tables above show what that means. Even at standard rates and on conservative assumptions, both projects pay back in around five years or less, on assets designed to generate for twenty-five years or more. The enhanced window improves a sound investment. It does not create one. A project that cannot be delivered by July is not a lost opportunity, and a well-planned project at standard rates will still outperform a rushed one.

Making the cash flow work

Solar starts saving money from the day it is energised, and the grant arrives soon after. SEAI pays within four to six weeks of receiving the completion documents, a little longer if the site is selected for inspection. With a good installer uploading paperwork quickly, the window between paying for the system and receiving the grant is short and predictable.

That makes the cash flow straightforward to plan. Payment stages can be matched to delivery milestones, and the grant can be scheduled into the budget as a known receipt rather than a hoped-for one. Where capital is committed elsewhere, financing can be structured so that repayments sit alongside the savings the system generates.

The administration is routine. Businesses receiving more than €10,000 in government grants in a year need a Tax Clearance Certificate, which most already hold or can obtain online through Revenue. Your accountant can confirm how the grant interacts with capital allowances.

Five questions a proposal should answer

1. How much will the system generate, and how much will the site actually use, by hour and by season?
2. What are the savings at your tariff, operating hours and weekend load?
3. What do the roof, planning, MIC and grid connection require, and what do they cost?
4. What grant payment is expected after the invoice cap, and on what delivery milestones?
5. What does the return look like under conservative assumptions?

Batteries can be assessed separately where they add value, but their cost is not eligible under this grant.

If a proposal can’t answer those five questions, it isn’t ready for a budget line.

Pinergy Solar works through these questions with businesses planning 2027 projects, from site assessment to grant, grid and delivery programme.

Grant information checked on 8 October 2026. Eligibility and payment remain subject to SEAI approval and scheme conditions. All worked examples are illustrative, not quotations or grant offers.

Sources

SEAI – Non-Domestic Microgen Grant

SEAI – Non-Domestic Microgen Scheme Application Guide

SEAI – Non-Domestic Microgen Scheme Terms and Conditions

ESB Networks – Small-scale generation

Central Statistics Office – Wholesale Price Index, August 2026 (wholesale electricity prices).