Alfred Loughwed  Gillespie, Co Roscommon, founded 1909, Dunmanway, First Electricity Power Station, Co. Cork and the Bandon Mills and electric Lighting Company, Coolfadda Mills.

The Bandon operation was controlled by the Brennan family. Joe Brennan first Governor of the Irish Central bank was of this family. The operation was taken over by the ESB when thy commenced nationwide electrification.

https://en.wikipedia.org/wiki/Joseph_Brennan_(civil_servant)

Since the 1950s Dunmanway has been the West Cork, Headquarters of the ESB.

There were local power stations in Bantry and Bandon prior to rural electrification.