Advisory issued in advance of the bank holiday weekend.
ESB is advising of the dangers and "potentially serious consequences" of swimming in any of its reservoirs, its two Kildare facilities.
It says "These areas are not appropriate for swimming because of the risk of deep and fast-flowing waters, changing water levels and uneven ground."
The utility has a reservoir in Leixlip and hydro-electric plant at Golden Falls, in Broadleas, as well as reservoir in west Wicklow, at Poulaphouca.
ESB says it "would also like to remind the general public who use our lands for leisure activities such as fishing and walking to adhere to current social distancing guidelines."

Kfm Weekend Obituary Notices
Two Men Charged In Connection With €4 Million Cocaine Seizure In Kildare And Wexford
Driving Testers At RSA Balloted For Industrial Action Over Concerns About Uninsured Vehicles
Homes Undelivered After Substantial Deposits Paid, Kildare Council Warns Of Potential Unauthorised Works
Over 1,000 E-Scooter Fines Issued As Kildare TD Calls For Tougher Penalties After Child Injured
Celbridge "Affordable" Homes Come With Council Equity Stakes
M4 Access Road To Castletown Will Reopen Next Week
Lucan Woman Pleads Guilty To Sending Threatening Messages To Tanaiste