Cathaleen’s Fall hydro‑electric power station

Overview

Cathaleen’s Fall hydro‑electric power station sits on the River Erne just east of Ballyshannon in County Donegal. Operated by the Electricity Supply Board (ESB), the plant harnesses a 45 m drop between the artificial lake created by its concrete gravity dam and the downstream tailrace. With a combined capacity of 65 MW, the station supplies enough electricity for roughly 26 000 homes and produces an average of 206 GWh a year. The dam is 1 km long, 15 m high and features three 30 m spillway gates. Its modernist generating hall, complete with curved cantilevered stairs and a glass‑roofed atrium, is an architectural highlight of post‑war Ireland.

History

The idea of damming the Erne dates back to the 1920s, but construction only began in 1946. Over nine years, the ESB (then the Electricity Supply Board) built the reinforced‑concrete gravity dam, excavated 600 000 m³ of earth and rock, and installed two Kaplan turbines supplied by KMW. The first turbine entered service in November 1951 and the second in 1952; the plant was officially declared operational on 1 October 1952.

The project was politically significant – it marked the first major co‑operation between the Republic of Ireland and Northern Ireland since independence, championed by Northern Prime Minister Basil Brooke and Irish Minister Seán Lemass. While the scheme flooded the celebrated Assaroe Falls and required the demolition of Camlin Castle, several 17th‑century houses and a historic four‑arch bridge, it proceeded without major public opposition.

In the decades since, the station has become a key part of the Erne Scheme, the second‑largest hydro‑electric complex in the country after Ardnacrusha on the Shannon. It also supports a thriving fish‑pass and hatchery that releases 500 000 salmon smolts and traps about 4 million elvers each year, helping to restore the river’s native stocks.

What to See & Do

Architecture & Engineering

The generating building is a textbook example of International Modernism in Ireland. Its flat‑roofed, block‑like mass is punctuated by linear strip lighting and horizontal fenestration. Inside, the main hall is an open steel‑and‑concrete space topped by a glass roof, while a striking curved concrete staircase leads to the upper levels. Visitors often comment on the interplay of light and shadow that the atrium creates throughout the day.

Guided Tours & Exhibition Centre

Since 2016 the ESB has offered free public tours (originally for schools) during the spring months. Tours run Tuesday‑Friday, 10:00 am–3:30 pm, and are booked online via the ESB education portal. A knowledgeable guide leads groups through the exhibition centre housed in the original art‑deco entrance, explaining the plant’s construction, the cross‑border partnership, and the social impact on the region. The visit continues into the control room, where the evolution of turbine technology and grid integration is demonstrated on historic panels.

Environmental Features

A purpose‑built fish‑pass allows salmon to negotiate the dam, while the on‑site hatchery produces half‑a‑million smolts each year. Interpretive displays explain how the station balances power generation with river ecology, making it a valuable stop for anyone interested in sustainable energy.

Cultural Connections

The weir at Cathaleen’s Fall inspired the fictional setting in Conor McPherson’s acclaimed play The Weir, adding a literary footnote to the industrial landscape.

Getting There & Parking

The power station is located on the Belleek Road, Townparks, just off the N15 bridge over the Erne. It is a short walk from the Ballyshannon bus stop (Bus Éireann routes 64 and 370) and from the town’s car park. On‑site free parking is provided for tour groups; a limited number of visitor spaces are available on a first‑come, first‑served basis. For those travelling from outside the region, the nearest railway station is in Sligo, with regular connections to Dublin and the west of Ireland; from there, a bus or car hire can be used to reach Ballyshannon (approximately 30 km).

Nearby Attractions

A visit to Cathaleen’s Fall fits easily into a day exploring the Erne Valley:

• Ballyshannon – Ireland’s oldest town, with a historic bridge, riverside walks and the Ballyshannon Heritage Centre.
• Assaroe Falls & Abbey – The original waterfall and monastic site that were submerged by the reservoir (Assaroe).
• Camlin Castle – The ruins of the 17th‑century castle demolished for the scheme (Camlin Castle).
• Ardnacrusha Power Station – Ireland’s first large‑scale hydro‑electric plant on the Shannon, a short drive to County Clare (Ardnacrusha).

Planning Your Visit

• Book ahead – Tours are limited to small groups; reserve a slot via the ESB education portal (link in the Practical Information table).
• Allow time – A full tour and exhibition experience takes about 90 minutes.
• What to bring – Comfortable shoes for the exhibition hall; the main exhibition area is wheelchair‑accessible, but the curved staircase is not. Staff can arrange an alternative route for reduced‑mobility visitors.
• Seasonal note – The fish‑pass operates year‑round, and the hatchery displays are available throughout the tour season.

Practical Information

When planning your visit, allow about 90 minutes for the full tour and exhibition experience. The station sits a short walk from the N15 bridge over the Erne, making it easy to combine with a stroll along the riverbank or a visit to nearby attractions such as the historic town of Ballyshannon.

Cathaleen’s Fall hydro‑electric power station is not only a functional piece of Ireland’s energy infrastructure but also a living museum of mid‑20th‑century engineering, architecture and cross‑border collaboration. Whether you’re a history buff, a renewable‑energy enthusiast, or simply curious about the hidden marvels of the Irish landscape, a visit offers insight, inspiration and a unique perspective on how power shapes place.