Atlantic Salmon (Salmo salar) running in the Newport River, which forms part of the upper River Mulkear catchment, Co. Tipperary. The River Mulkear joins the River Shannon downstream of the ESB hydroelectric scheme. Salmon can reach these spawning grounds without having to negotiate the Shannon hydroelectric dams.
I have watched hundreds of salmon ascend this cascade on the Newport River, on their way to spawning grounds in a catchment of approximately 90 km² upstream of this point. In comparison, the vast Shannon catchment upstream of the hydroelectric scheme covers approximately 10,400 km² - about 116 times larger than this small tributary catchment.
Yet Inland Fisheries Ireland reported just 41 salmon ascending through the fish lift at Ardnacrusha during the whole of 2025, with the counter operational throughout the year. I have personally watched more salmon pass the cascade on the Newport River in one afternoon. This is in a catchment less than one percent of this size of the River Shannon catchment upstream of the ESB dams.
The conservation limit for the Upper Shannon has been calculated to be 49,638 adult salmon annually. This reflects the spawning requirement associated with the extensive juvenile salmon habitat throughout the cascade catchment. It gives some indication of the scale of the salmon population this vast river system should support.
Salmon have declined widely across Ireland and the North Atlantic. However, the declines on rivers with ESB dams are in a league of their own. ESB’s own 2024 report acknowledges that genetic analyses found the original wild salmon stocks above the hydroelectric stations on the Shannon, Erne and Lee to be extinct. That is an extraordinary loss of our natural heritage.
ESB recently rebranded its fisheries work as “ESB Sustainable Rivers”. Yet the fundamental problems associated with its hydroelectric operations - obstructed fish passage, turbine impacts, altered river flows, and fragmented salmon habitat - remain unresolved. The branding has changed; the ecological damage has not been remedied. In my opinion, this is pure greenwashing. That such claims can be presented without demonstrating the recovery of these rivers reflects a wider failure of accountability in river management in Ireland.