Solar Panels in St Johnston, Co. Donegal
St Johnston is a small town in Co. Donegal with a population of around 571. Located 17.8 km from Letterkenny, the area receives 1,175+ sunshine hours per year. A 4kWp solar system generates approximately 3,268 kWh annually — saving an estimated €980+ per year. The SEAI grant of up to €1,800 and 0% VAT bring the net cost to €3,200–€6,200.
St Johnston solar yield and performance data
Solar Yield
4kWp Output
Sunshine
Est. Savings
Household Coverage
Population
Eircode Area
Dist. to Letterkenny
Location
Based on county-level solar data for Donegal. Actual output varies by roof orientation, shading, and system specification.
St Johnston and Renewable Energy
St Johnston is a small town in Co. Donegal with a population of 571 (CSO Census 2022). It is a short drive from Letterkenny (17.8 km), where most SEAI-registered installers in the county are based. The Eircode routing key for St Johnston is F94 — you'll need your full Eircode when applying for the SEAI grant.
Why Go Solar in St Johnston?
Save on Electricity Bills
Homeowners in St Johnston can save an estimated €980+ per year on electricity with a 4kWp solar system generating 3,268 kWh annually.
SEAI Grant — Up to €1,800
Get up to €1,800 back from SEAI. The grant is available for homes built before 2021. No means testing — apply online at seai.ie.
0% VAT on Installation
Residential solar installations are zero-rated for VAT since May 2023, saving approximately €1,000 on a typical system.
Earn from Excess Energy
Sell surplus electricity at 15-25c/kWh through the Microgeneration Support Scheme. The first €400/year is tax-free.
Increase Property Value
Solar panels improve your BER rating and can add up to 4% to your property value.
25+ Year Lifespan
A system installed in St Johnston today will generate clean electricity for 25-30 years with minimal maintenance.
SEAI Solar Grant for St Johnston Residents
Homeowners in St Johnston, Co. Donegal can apply for the SEAI solar PV grant. The maximum grant of €1,800 is confirmed for 2026.
| System Size | Grant Amount | Typical Net Cost |
|---|---|---|
| 2 kWp | €1,400 | €2,000 - €3,000 |
| 3 kWp | €1,600 | €2,500 - €4,000 |
| 4 kWp+ | €1,800 (max) | €3,200 - €6,200 |
Solar Installers in Donegal
SEAI registered solar panel installers covering Donegal.
Nearby Towns Also Served
Also serving nearby areas in Donegal:
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Frequently Asked Questions About Solar Panels in St Johnston
How much do solar panels cost in St Johnston?
A 4kWp system in St Johnston typically costs €5,000-€8,000 before grants. After the €1,800 SEAI grant and 0% VAT, the net cost is €3,200-€6,200. The system generates approximately 3,268 kWh/year, paying for itself in 4-6 years.
How much electricity will solar panels generate in St Johnston?
Based on Donegal county data, a 4kWp system in St Johnston generates approximately 3,268 kWh per year — covering 78% of average household use (4,200 kWh/year). Donegal receives around 1,175 sunshine hours annually.
Are solar panels worth it in St Johnston?
Yes. With estimated savings of €980+ per year, the €1,800 SEAI grant, 0% VAT, and export income of 15-25c/kWh, a solar system in St Johnston pays for itself in 4-6 years and lasts 25+ years.
Can I get solar panels on an east or west facing roof in St Johnston?
Yes. East or west-facing roofs still produce 80-85% of the output of a south-facing roof. Many installers recommend splitting panels across east and west to spread generation throughout the day, which can actually improve self-consumption.
Is my roof suitable for solar panels in St Johnston?
Most roofs are suitable. You need at least 15-20 m² of unshaded roof space for a typical 4kWp system (10 panels). South, east, or west-facing roofs work well. Your installer will assess your roof's orientation, angle, and structural suitability during a site survey.
How do I get the SEAI grant in St Johnston?
Apply online at seai.ie with your MPRN and Eircode. Use an SEAI-registered installer. Do not start work before your Letter of Offer. After installation, complete a BER assessment. The grant is paid to your bank within 4-6 weeks.
Sources
Last updated: February 2026
Reviewed by the Solar Info editorial team. Editorial policy
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