Eirgrid is warning of a 'challenging outlook' for Ireland's electricity supply in the next ten years.
Its latest Generation Capacity Statement says demand is outstripping supply which could lead to more regular outages over the next decade.
The state-owned body is warning that blackouts and system alerts may become more frequent, as the economy grows and the demand for energy rises.
The electrification of the heat and transport sectors has been cited as a factor. Data centres are also expected to account for almost 30% of electricity demand by 2031.
It also found Irish power plants are deteriorating in availability, as some will be reaching their intended retirement dates.
Eirgrid says the situation is due to improve with Single Electricity Market capacity auctions in the coming years.
The Single Electricity Market, is a wholesale market, where electricity is traded in bulk across the island of Ireland.
Eirgrid is the state-owned body, responsible for the transmission of power from generation plants to energy companies.