Tonn Nua
Tonn Nua ('New Wave') is a 900 MW fixed-bottom offshore wind farm off the coast of County Waterford, Ireland.
Status
Advanced Developmentlifecycle stage
LikelyHafrok delivery likelihood
Location
IrelandCeltic Sea
Technology
Capacity
900 MW ◆
Turbines
—
Foundation
Fixed-bottom (structure not recorded) ◆
Site & conditions
Site rights
Seabed rights held ∴
Origination
ORESS 2.1 (Tonn Nua, south coast) · 2025 ·
Water depth
48–69 m ◆
Distance from shore
12.2 km ◆
Wind speed
10.1 m/s @ 150 m ≈
Revenue & grid
Offtake
CfD · €98.719/MWh ◆
Grid
No agreement ◆
Connection
EirGrid developing offshore transmission infrastructure under … ◆
Schedule
FID
expected 2031 ◆
COD · Hafrok
for registered readers
Delivery outlook modelled by Hafrok · calibrated on delivered projects
LikelyHafrok's delivery likelihood for Tonn Nua
The developer has stated no date. Hafrok's year, the chance and the working are for registered readers.
Free for registered readers in early access · register below ↓
Project timeline & ownership verified milestones on the spine · ownership from Hafrok's transactions record
the dated milestones on the spine, each with its source · 3 recorded ownership deals from Hafrok's transactions record · the developer's announced-COD history
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Revenue & offtake contract terms, price levels and the route to market
the contract terms on record · price over time in money of the day · the routes to market and the next visible round
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Installation how the build is going · from sourced statements and Hafrok's registers
construction status and turbines standing · vessel and port contracts · the grid connection and whether it is ready in time
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Sources & verification
Rests on 16 sources (12 primary) · ◆ 12 documents held
◆Verified≈Modelled◇Sourced∴Inferred⌁Convention○Unverified∅No source·Derived
Numbers are stable citation ids — grouped by source class, so they are not consecutive.
Regulator5
[1]
Government of Ireland — Department of Climate, Energy and the Environment2025-12-09◆ ORESS 2.1 Tonn Nua result
“Helvick Head Offshore Wind DAC, a joint venture partnership between ESB and Denmark-based renewable energy developer Ørsted, has been selected as the developer for Tonn Nua. The project will have a ta…”
supportsTotal capacityWater depthDistance from shore
[2]
Government of Ireland — Department of Climate, Energy and the Environment2026-05-28◆ ORESS Tonn Nua Offshore Wind Auction
“Helvic Head Offshore Wind DAC is now confirmed as the auction winner with an offer price of €98.719 per megawatt hour. Helvic Head is a joint venture partnership between ESB and Denmark-based renewabl…”
supportsownerConsentTotal capacityMechanismStrike / price+1 more
[3]
Government of Ireland — Department of Climate, Energy and the Environment2024-10-24◆ The South Coast Designated Maritime Area…
“The Plan identifies four Maritime Areas in the Irish part of the Celtic Sea within which proposed future ORE projects may be located, which in this instance relates to fixed offshore wind technology. …”
supportsFoundation
[11]
Government of Ireland — Department of Climate, Energy and the Environment2025-05-27◆ ORESS Tonn Nua (2.1) Terms and Condition…
“7.3.4 Eligible Technology. The ORESS Tonn Nua Auction will be open to New Projects which are connected directly to the electricity network and metered independently of any other electricity generating…”
supportsFoundation
[15]
Government of Ireland, Department of Transport2026-08-27◆ Marine Notice No. 37 of 2026: Tonn Nua O…
“The Department of Transport has been advised that Helvick Head Offshore Wind Designated Activity Company (T/A Tonn Nua Offshore Wind Farm (OWF)) intends to undertake a geophysical survey campaign of t…”
supportsStatus note
Operator7
[4]
EirGrid2025-11-26
“Helvick Head Offshore Wind DAC, a joint venture partnership between ESB and Denmark-based renewable energy developer Ørsted, has been selected as the developer for Tonn Nua, Ireland's second offshore …”
supportsBackground
[5]
EirGrid2026-03◆ Offshore Energy Future | Projects | EirG…
“Tonn Nua represents the first Area being connected into the grid within the larger Powering Up Offshore – South Coast Programme. The infrastructure will include two offshore substation platforms to be…”
supportsStatusConnection point
[6]
ESB2023-06-02
“Ørsted becomes a 50/50 partner in a pipeline of offshore wind development projects off the Irish coast.”
supports↳ parent
[10]
Maritime Area Regulatory Authority (MARA)2026-09-17◆ MARA applications and determinations reg…
“MAC240057 | Helvick Head Offshore Wind Designated Activity Company | Waterford | Permitted Maritime Usage - The development of a 900 megawatt (MW) offshore windfarm | received 2025-12-11 | Determined …”
supportsRegister entry
[12]
ESB2025-11-26◆ ESB and Ørsted Joint Venture wins the pr…
“The contract facilitates the development of a 900 MW fixed-bottom offshore wind farm for the Tonn Nua site. [...] Currently in an early phase of development [...] First power from the site is expected…”
supportsFinal investment decisionCOD history
[13]
Maritime Area Regulatory Authority (MARA)2026-03-26◆ MAC240057: Helvick Head Offshore Wind DA…
“Applicant Helvick Head Offshore Wind Designated Activity Company ... Location of Activity Tonn Nua, off the coast of Co. Waterford Activity Permitted Maritime Usage - The development of a 900 megawatt…”
supportsStatus note
[14]
EirGrid2026-04-22◆ EirGrid announces substantial procuremen…
“The Powering Up Offshore – South Coast Tonn Nua Substation Package is the first major transmission procurement launched under this framework and marks a key milestone in operationalising Ireland’s off…”
supportsStatus note
Auction results1
[16]
Philip Lee LLP2026-06-22◆ ie-oress-2-1-tonn-nua-2025-tonnnua-tc
ORESS Tonn Nua T&C: escalating Performance Security EUR 80m/100m/120m; Longstop 1 Jan 2037
supportsTender award · ORESS 2.1 (Tonn Nua, south coast)
Trade press3
[7]
offshoreWIND.biz2025-11-26◆ Ørsted-ESB Joint Venture Wins 900 MW Iri…
Press report — cited, not quoted; read it at the source link.
supportsFirst powerTotal capacityFoundationport
[8]
4C Offshore2026
Press report — cited, not quoted; read it at the source link.
supportsCoordinates
[9]
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