Solar is starting to shape Ireland’s electricity system, but delivery must now catch up with ambition

Ireland’s electricity system reached an important milestone in March, with close to 50% of electricity generated from renewable sources.

New data from EirGrid shows that while solar remains a relatively small part of the overall mix, its contribution at key moments is becoming increasingly significant. At times during the month, grid-scale solar met over 20% of electricity demand. These peak periods demonstrate the role solar can play as deployment continues.

Just as importantly, the data highlights the growing impact of rooftop solar.

On brighter days, less electricity is required from large-scale, grid-connected generation. This reflects the increasing number of homes, farms and businesses generating their own power. These are tangible signals of progress.

But they also raise a more important question.

Progress is visible, but the system is not yet set up to maximise it

Ireland continues to face structural challenges across planning, grid connection and delivery.

• Projects are delayed or slowed by complex planning processes
• Grid capacity and connection timelines remain a key constraint
• Policy signals, while improving, are not yet fully aligned with delivery needs

At the same time, Ireland remains highly exposed to international fossil fuel prices - a key driver of electricity costs. Solar can help address this exposure. But only if deployment is accelerated at scale.

The latest data shows the direction of travel:

• Solar is contributing during peak periods
• Rooftop generation is reducing demand on the system
• Reliance on fossil fuel generation can be reduced at certain times

However, these impacts are still limited by scale.

To move from early impact to system-wide benefit, Ireland needs:

• Faster and more predictable planning processes
• Grid investment and connection reform
• Strong, consistent support for rooftop and distributed solar
• Greater coordination across Government, industry and communities

Ronan Power, CEO of Solar Ireland, said:

“The latest EirGrid data shows that solar is beginning to make a measurable contribution to Ireland’s electricity system, particularly during periods of strong generation. It also highlights the growing role of rooftop solar. When homes and businesses generate their own electricity, it reduces demand on the system and limits the need for fossil fuel generation at those times.

But we need to be clear - the system is not yet set up to fully capture these benefits. Planning, grid and delivery processes are still slowing progress. The opportunity now is to bring Government, industry and communities together to accelerate deployment. That is how we turn early progress into meaningful impact for affordability, energy security and climate targets.”

A shared responsibility

Solar’s growth in Ireland has been rapid, with installed capacity increasing significantly in recent years. But the next phase will require more than momentum.

It will require:

• Clear policy direction
• Investment in enabling infrastructure
• Public participation through rooftop adoption
• Strong coordination across the energy system

The data shows what is possible. The challenge now is delivery.

Read EirGrid's full analysis here: March sees almost 50% of electricity generated by renewables with new records for grid scale solar