The 75 MW/150 MWh BESS is aimed at enhancing grid stability and facilitating greater integration of renewable energy into Ireland's power network.. Ireland inaugurated the country's 'largest' grid-scale battery energy storage facility, located in Poolbeg Energy Hub. Images: Fluence via LinkedIn. The project, with an investment. . Jim Dollard of ESB, Sean Rapple of Kirby Group, Eamon Ryan, Minister for the Environment, Climate and Communications, Paul McCusker, Fluence President of EMEA, and Claire Quane of ESB. ESB has officially opened a major battery plant at its Poolbeg site in Dublin, which will store excess renewable. . Irish state-owned utility ESB on Wednesday opened a 75-MW/150-MWh battery energy storage plant, currently Ireland's largest, at its Poolbeg site in Dublin. Image by ESB on Linkedin. The battery is part of a project pipeline, representing an investment of up to EUR 300 million (USD 323m), that ESB. . Operational since November last year, the project has the capacity to provide 75MW of energy to Ireland's electricity system for around two hours. ESB, the state-owned electricity company, has announced the opening of a major battery plant at its site in Poolbeg, Dublin. The battery plant will add.