Ireland Rooftop Solar: Reaching 1 GW Capacity in Early 2026
In a landmark achievement for Ireland’s renewable energy ambitions, the nation has officially surpassed 1 gigawatt (GW) of installed rooftop solar capacity. This significant milestone, confirmed in a joint announcement by Solar Energy Ireland (SEI) and the Department of the Environment, Climate and Communications (DECC) on February 28, 2026, marks a pivotal moment in the country’s transition to clean energy.
Once considered an unlikely candidate for a solar revolution due to its famously cloudy climate, Ireland has demonstrated remarkable progress, transforming its rooftops into a distributed network of power generation. The journey from under 100 megawatts (MW) in 2020 to over 1,000 MW in early 2026 is a testament to strong policy, falling technology costs, and growing public enthusiasm.
The Explosive Growth Trajectory of Ireland Rooftop Solar
The acceleration in solar adoption has been nothing short of exponential. Data released by SEI paints a clear picture of this rapid growth. By the end of 2025, cumulative capacity had reached 987 MW. The final push over the 1 GW line came in January 2026, with an additional 13 MW installed across the country.
Here’s a look at the year-on-year growth that fueled this achievement:
- 2023: 250 MW of new capacity was added, bringing the cumulative total to 350 MW from approximately 25,000 new systems.
- 2024: The market surged with 400 MW of new installations, pushing the total to 750 MW from around 40,000 systems.
- 2025: A further 237 MW was added, with roughly 28,000 new systems bringing the year-end total to 987 MW.
This momentum has resulted in over 94,000 homes and 4,000 businesses now harnessing the power of the sun, collectively generating an estimated 1.2 terawatt-hours (TWh) of clean electricity annually—enough to power a quarter of a million average Irish households.
The Policies and Economics Powering the Ireland Rooftop Solar Boom
This success wasn’t accidental. It was driven by a combination of strategic government initiatives and compelling economic factors that made solar an irresistible investment for Irish citizens and businesses.
Key Policy Drivers:
- Micro-generation Support Scheme (MSS): Launched in 2022, the MSS has been a game-changer. It provides grants covering 50-60% of installation costs and offers a clean export guarantee, allowing owners to sell surplus energy back to the grid for up to 24 cents per kilowatt-hour (c/kWh).
- VAT Reduction: A 0% VAT rate on the supply and installation of solar panels, in effect until 2027, has significantly lowered the upfront cost for consumers.
- National Climate Goals: Ireland’s ambitious Climate Action Plan 2024, which targets 8 GW of total solar capacity by 2030, has created a stable and encouraging policy environment for long-term investment.
Alongside government support, the economic case for solar has become undeniable. With panel costs falling to between €0.80 and €1.00 per watt, the return on investment now stands at an impressive 15-25%, with payback periods as short as 5 to 7 years.
Why This 1 GW Milestone Matters for Ireland Rooftop Solar
Reaching this target is more than just a number; it represents a fundamental shift in Ireland’s energy landscape.
- Enhanced Energy Security: With Ireland importing approximately 70% of its energy, primarily fossil fuels, this distributed solar network reduces reliance on volatile international gas markets.
- Significant Carbon Reduction: The 1 GW of rooftop solar is estimated to cut Ireland’s carbon emissions by around 500,000 tonnes per year, making a tangible contribution to its climate targets.
- Democratization of Energy: It empowers individuals and communities to become active participants in the energy transition, generating their own clean power and lowering their electricity bills.
The Road Ahead: Challenges and Opportunities for Ireland Rooftop Solar
While celebrating this milestone, stakeholders are already looking toward the future. SEI projects that Ireland could reach 1.5 GW of rooftop solar by the end of 2026, with the commercial and industrial rooftop sector poised for major growth under the Renewable Electricity Support Scheme (RESS).
However, challenges remain. As highlighted in EirGrid’s Grid Insights, the rapid influx of solar generation requires significant grid upgrades to manage export limits and ensure stability. Furthermore, planning delays in some rural areas continue to be a hurdle that needs to be addressed to maintain momentum.
Despite these challenges, the message is clear: Ireland has successfully harnessed its solar potential. The 1 GW milestone is not an endpoint but a powerful foundation for a brighter, cleaner, and more energy-independent future.
