The Sunday Business Post [paywall] reports that a British energy firm called SSE plc [formerly Scottish and Southern Energy plc], which already owns Airtricity, intends to buy Endesa Ireland. SSE’s press release is here.
Endesa owns the power stations at Tarbert, on the Shannon Estuary, and Great Island, at the junction of the Barrow and Suir estuaries; both are covered on this website. Endesa also owns a power station at Rhode, near the Grand Canal, and one in Co Mayo. It seems that SSE will also acquire options on sites at Lanesborough and Shannonbridge.
Irish waterways history 