Ireland generated more wind power than its electricity network could handle during the first half of 2026, highlighting how grid infrastructure is becoming one of the biggest obstacles to the clean energy transition. According to RTÉ, enough wind energy to power approximately 667,000 homes was curtailed between January and June after the national grid was unable to absorb the electricity being produced. Wind Energy Ireland estimates that around 15% of the country’s lowest-cost electricity was effectively wasted during the period because of network limitations.
The figures illustrate a growing challenge facing renewable energy markets around the world. Building more wind and solar capacity alone is no longer enough. Without adequate transmission networks, storage systems, and flexible grid operations, a significant share of clean electricity cannot reach consumers. In Ireland’s case, the constraint is no longer wind generation. The country has invested heavily in renewable energy and continues to expand its wind fleet. The problem is that transmission infrastructure has not kept pace with generation growth, forcing grid operators to curtail renewable output even when electricity demand remains strong.
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The lost electricity also carries an economic cost. Wind is among Ireland’s lowest-cost sources of new power generation. Every megawatt-hour that cannot be delivered must often be replaced by more expensive generation elsewhere on the system, reducing the overall efficiency of the power market and slowing progress toward emissions targets. The situation underscores an increasingly important lesson for energy policymakers: renewable energy targets must be matched by investment in the networks that transport electricity. Transmission lines, substations, battery storage, and grid modernization are becoming just as critical as new generation projects.
Countries across Africa face many of the same structural challenges. Nations including Kenya, Egypt, and Malawi are expanding renewable generation, but many also need stronger transmission infrastructure and greater system flexibility to integrate growing volumes of variable solar and wind power. Without those investments, renewable capacity additions alone will not deliver their full economic or environmental benefits. Ireland’s experience demonstrates that the next phase of the energy transition is increasingly about infrastructure rather than generation. As renewable capacity continues to grow, the ability of electricity networks to move, balance, and store clean power will determine how much of that energy is ultimately used.
