Wind and solar power are central to Ireland’s shift away from fossil-fuel-based electricity generation. However, these renewable energy sources need to be stored for periods when wind and sunlight are unavailable, according to Clare Duffy of ESB.
While wind and solar energy are significantly helping reduce Ireland’s carbon emissions, they present a key challenge: intermittency. The wind doesn’t always blow, and the sun doesn’t always shine. So, the question arises: how can we meet electricity demand when renewable energy sources aren’t fully available?
“One way to address this is by storing excess renewable energy in large-scale batteries,” says Clare Duffy. “There are times when renewable energy generation exceeds the country’s demand, such as on windy or sunny days. By developing storage capacity, companies like ESB can store this surplus energy and have it available to supply power instantly when needed, ensuring a stable electricity supply.”
She further explains that ESB envisions a secure, net-zero energy system for Ireland by 2050, which will rely on three main components: renewable energy, energy storage, and traditional backup generation. This integrated approach will not only improve energy security by reducing Ireland’s reliance on fossil fuels from unstable regions but also support the growth of domestically produced energy. “Essentially, we’re swapping geopolitical risk for meteorological risk, meaning backup technologies will always be necessary to complement renewable energy,” she adds.
As part of ESB’s strategy to reach net-zero by 2040, Duffy and her team are exploring investment opportunities to build energy storage systems, grid services, and backup generation facilities. These will ensure Ireland’s energy security in the near-to-medium term and help integrate renewable energy more effectively in the long term.