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Partnering with Ørsted to deliver the Tonn Nua offshore wind farm

In partnership with Ørsted, we were provisionally awarded the rights to develop the Tonn Nua site off the coast of County Waterford by The Department of Climate, Energy and the Environment (DCEE).

Currently in an early phase of development, once completed the site will span 306 square kilometres with expected capacity output of approximately 900MW, enough energy to power almost one million homes based on the wind prevalence in the area.

Read the press release

Our Generation Portfolio

Carrigadrohid

Feb 23, 2022, 15:59 PM
Title : Carrigadrohid
Location : Co. Cork
Select a choice : Hydro
Latitude : 51.8974959
Longitude : -8.8617986

Fuel: Water

Capacity: 27 MW

Commissioned: 1952-57

Technology: Voith turbine with Brown Boveri or Siemens generators


Our Lee Hydro Stations span two locations at Inniscarra and Carrigadrohid in the Lee Valley, around 14 km from Cork City. Built between 1952 and 1957, they joined the schemes of the rivers Shannon, Erne and Liffey to become our fourth major hydroelectric development. This involved creating two lakes in the Lee Valley, which:

  • covers an area of 14km² and
  • have a storage capacity of 45 million cubic metres.

Overall, the stations have a combined capacity of 27 MW.Inniscarra has two generating units: one produces 15 MW and the other produces 4 MW. Both units use Voith turbine with Brown Boveri generators, which operate under an average head of 30m.


Carrigadrohid has one generating unit (Voith turbine/Siemens generator) with a capacity of 8 MW, operating under an average head of 13m.

Developing and acquiring 1.2 GW of solar energy by 2030

Solar is increasingly central to our net zero energy ambitions. We aim to develop and acquire 1.2 GW of solar by 2030 and continue to develop our growing solar energy portfolio, partnering with others to help deliver this.

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More than 25 years of expertise of onshore wind

Since 1998, starting with our 5MW wind farm in Crockahenny in Co Donegal, we’ve built an onshore wind portfolio supplying nearly 850MW of clean energy in Ireland and the UK.

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Growing our battery storage facilities

We are at the forefront of developing battery systems, supporting the decarbonisation of Ireland's electricity system. We currently have more than 300MWs of battery storage capacity in operation in Ireland, making it one of the largest battery portfolios in Europe.

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Our hydrogen ambitions

We believe hydrogen produced from renewable electricity will play a critical role in the decarbonisation of many sectors. We plan to use our existing capabilities and future renewable growth to become a leading player in large scale renewable hydrogen production, thereby enabling renewable electricity, in the form of electrons or green modules, to meet the energy requirements of Ireland’s future zero carbon economy.

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Investing in offshore wind energy

Offshore wind is playing a major role globally in our fight against climate change and our transition to a zero carbon economy.

We have been involved in offshore wind since 2017 with a number of planned projects for Ireland and the UK.

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Our people working in generation

Meet Joe Shinkwin, Onshore Wind Project Director in our Generation and Trading business. Joe shares how the projects he works on not only deliver clean energy but also create a community benefit fund to support local initiatives. At ESB, we’re investing in renewable energy to help reach net zero emissions, and we’re proud of the people making it happen.

Our people working in generation video