Ireland’s power system is entering winter in a stronger position than many feared just a few years ago. According to EirGrid, Irish electricity imports from Britain now account for about 16% of supply, helping the grid meet rising demand while reducing the risk of shortages during the coldest months.
The latest winter outlook from the national grid operator points to a more resilient system, supported by new generation capacity, temporary backup units, battery storage and undersea interconnectors with Britain. For households, businesses and policymakers, the message is notable: Ireland is still reliant on external support, but near-term electricity security looks considerably improved.
Irish Electricity Imports From Britain Are Playing a Bigger Role
EirGrid says the Republic and Northern Ireland combined now source roughly one sixth of their electricity through three interconnectors running beneath the Irish Sea. Recent figures show Britain supplied 15.8% of electricity over the 12 months to July, following a 16.4% share in 2025.
That makes Irish electricity imports from Britain a critical part of the all-island energy mix. These imports act as a balancing tool when domestic generation is tight, especially during periods of high demand or lower renewable output.
The significance of these links goes beyond simple trade. They provide:
- Additional flexibility during winter peak periods
- Access to external power when Irish generation is under pressure
- Improved overall grid stability
- Better integration of renewable energy across connected markets
EirGrid has indicated there is no current sign that these imports are at risk, an important reassurance as winter demand rises.
Why Ireland’s Winter Electricity Outlook Has Improved
The central takeaway from EirGrid’s assessment is that the risk of supply shortfalls is now at its lowest level in several years. Peak electricity demand in the Republic could reach a record 6,100 megawatts this winter, above the previous high of 6,024MW recorded in January 2025. Even so, the system operator expects enough capacity to meet that demand with a meaningful reserve margin.
A key metric here is the “loss of load expectation,” which measures the probability that available generation may not fully meet instantaneous demand. For the full winter period, that risk is estimated at less than 50 minutes in total. That is a sharp improvement from 1.1 hours last winter and 3.6 hours the year before, and it sits well below the three-hour reliability standard used by the Department of Energy.
In practical terms, this does not mean blackouts are expected for 50 minutes. It is a risk-based planning measure, not a forecast of outages. EirGrid’s view is that the likelihood of actual shortages remains low.
What Has Strengthened the Grid?
Several additions have helped improve supply security since last winter. EirGrid says 1,084MW of new generation capacity has been connected, along with 63MW of battery storage. Those additions include:
- 275MW of fast-response gas-fired generation at Castlelost, Co Offaly
- 809MW of new wind and solar generation
- Grid-connected batteries that can support balancing and flexibility
Together, these investments have made the system more capable of handling spikes in demand and dips in renewable output. They also reduce the pressure on emergency backup measures, though those remain part of the wider resilience plan.
The Limits of Relying on Irish Electricity Imports From Britain
While Irish electricity imports from Britain are helping secure winter supply, dependence on imported power also raises strategic questions. Cross-border electricity trade can be highly efficient, but it leaves Ireland somewhat exposed to conditions in another market, including generation constraints, price volatility and infrastructure risks.
This is why interconnection should be seen as one part of a broader energy security strategy, not the whole answer. Long term, Ireland will still need to expand domestic capacity, modernise its grid and improve storage if it wants to reduce vulnerability.
Key challenges include:
- Rising electricity demand from homes, business and data centres
- The variability of wind and solar generation
- The cost of emergency capacity measures
- The need for faster delivery of new infrastructure
In other words, Irish electricity imports from Britain are useful and increasingly important, but they are not a substitute for building a more self-sufficient and flexible power system at home.
Emergency Generators Still Matter, but at a Cost
EirGrid continues to hold temporary generators in Dublin, Offaly and Kerry as an emergency backstop. These units were called upon twice during the summer to support supplies, the first such operational use since they were commissioned in 2023.
Regulators have already confirmed that the generators will remain available until 2028 or 2029 at the latest. They have strengthened energy security, but they come at a substantial financial cost. By the time they are fully retired, electricity customers are expected to have paid about €1.4 billion for the emergency scheme.
There is also a last-resort option at the former Tarbert power plant, where turbines have been converted from coal to heavy fuel oil. EirGrid says those units have not been used, though they have been placed on standby when conditions warranted extra caution.
What This Means for Ireland’s Energy Future
The latest outlook shows a system that is more stable than it was, but still in transition. New gas plants, renewable generation, batteries and Irish electricity imports from Britain are working together to lower short-term risk. That is good news for consumers worried about winter reliability.
Still, the bigger story is that Ireland’s electricity system remains a balancing act between decarbonisation, affordability and security. Imports can help close the gap, but long-term resilience will depend on continued investment in generation, storage, interconnection and grid upgrades.
For now, the conclusion is clear: Irish electricity imports from Britain are a vital support for the grid, and EirGrid believes they will help Ireland get through winter with power to spare. The next challenge is turning that short-term stability into a durable energy strategy for the years ahead.
