Horizon Nuclear Power

Horizon Nuclear Power
Name	Horizon Nuclear Power
Type	Private
Industry	Nuclear energy
Founded	2009
Defunct	2020 (operations wound down)
Headquarters	London, United Kingdom
Key people	Mark McAllister (former CEO), Gareth Pennell (former CFO)
Parent	Hitachi (former), E.ON (former minority stakeholder), RWE (former minority stakeholder)
Products	Nuclear power stations, nuclear development rights

Horizon Nuclear Power was a United Kingdom–based developer established in 2009 to pursue new nuclear power station projects in England and Wales. Founded by two major utilities and later acquired by an international conglomerate, it sought to site, gain regulatory consent for, finance and build new large-scale nuclear plants using advanced reactor designs. The company engaged with UK planning authorities, corporate partners, and community stakeholders before its primary owner suspended new-build activity in 2019 and subsequently wound down operations.

History

Horizon was formed in 2009 by E.ON and RWE to combine their UK nuclear development assets and pursue new-build opportunities, linking to earlier projects such as Wylfa and Oldbury. In 2012 the company shortlisted reactor designs from vendors including Areva, Westinghouse Electric Company, and GE Hitachi, aligning with worldwide deployments of models like the EPR (European Pressurised Reactor) and the AP1000. In 2012–2015 Horizon negotiated with national institutions including Department of Energy and Climate Change, Office for Nuclear Regulation, and Environment Agency (England and Wales) as part of the UK’s broader Energy Act 2013 framework. In 2012–2013 the firm entered acquisition talks that culminated in 2012–2015 regulatory scrutiny before Hitachi agreed to acquire Horizon in 2012–2015 timeframes; the formal acquisition completed in 2012–2015 sequence. Between 2014 and 2017 Horizon advanced site consenting work, while international events—such as financial pressures on Toshiba and strategic shifts at E.ON and RWE—reshaped the UK nuclear sector. In 2019 Hitachi announced suspension of the Horizon projects, citing financing and market conditions, and in 2020 began formal withdrawal, aligning with contemporaneous project cancellations including aspects of NuGeneration and changes at EDF Energy.

Corporate structure and ownership

Originally a joint venture, Horizon reflected corporate consolidation trends among E.ON and RWE in the aftermath of asset realignments tied to European energy market reforms. The acquisition by Hitachi transferred ownership to a Japanese multinational engaged in nuclear technology through affiliates such as Hitachi-GE Nuclear Energy and commercial relationships with Toshiba and Mitsubishi Heavy Industries. Horizon’s executive team liaised with figures from National Grid plc and consulted sector advisors including former executives from Centrica and Scottish and Southern Energy. Throughout its existence Horizon interacted with investment banks and insurers such as Goldman Sachs and Lloyd’s of London entities while negotiating contractual frameworks analogous to those used by EDF Energy at Hinkley Point C.

Proposed projects and sites

Horizon focused on two primary sites: a new station at Wylfa on the island of Anglesey and a site at Oldbury-on-Severn in Gloucestershire. The Wylfa proposal envisioned deployment of advanced boiling water reactor or pressurised designs similar to the ABWR and UK ABWR concepts, referencing technology suppliers like GE Hitachi and Mitsubishi Heavy Industries. Oldbury proposals considered options reflecting lessons from Heysham and Sizewell developments. The company undertook environmental baseline studies akin to those performed for Hinkley Point and Sizewell C and engaged with local authorities including Isle of Anglesey County Council and South Gloucestershire Council.

Regulatory and planning approvals

Horizon’s consenting pathway involved multiple statutory processes: a generic design assessment with the Office for Nuclear Regulation, environmental permits with the Environment Agency (England and Wales)], and development consents under the Planning Act 2008 via the Planning Inspectorate. Site-specific assessments referenced precedents set by Hinkley Point C and the Sizewell C programme. Public consultations and statutory hearings included stakeholders such as Natural England and local elected bodies, mirroring regulatory interactions experienced by NuGeneration and Magnox estate projects. Safety submissions aligned with international standards from agencies like the International Atomic Energy Agency.

Financing and commercial strategy

Horizon planned to combine equity from corporate owners with structured finance instruments similar to contracts used in Hinkley Point C, exploring mechanisms such as the Contract for Difference model and private finance arrangements comparable to those pursued by Toshiba and Westinghouse Electric Company affiliates. Hitachi explored export credit agency support and consortium arrangements involving Japanese government–linked finance institutions and corporate partners like Mitsubishi Heavy Industries, while referencing commercial structures used by Areva and Rosatom. The company sought offtake and power purchase agreements engaging utility purchasers including National Grid ESO and industrial consumers, and negotiated potential industrial supply chains reflecting procurement patterns of Rolls-Royce (engineering) and Babcock International.

Criticism, controversies and public response

Horizon’s projects attracted criticism from environmental groups such as Friends of the Earth and community activists aligned with campaigns seen at Nuclear Free Local Authorities and Stop Hinkley protests. Concerns mirrored national debates involving Climate Change Committee reports, lifecycle carbon assessments by Committee on Climate Change, and parliamentary scrutiny via the House of Commons Energy and Climate Change Select Committee. Financial transparency, cost risk allocation and reliance on foreign suppliers provoked scrutiny from MPs across parties including members of Welsh Affairs Committee and local representatives from Plaid Cymru and the Conservative Party (UK). Safety, waste disposal and decommissioning questions referenced national arrangements with Nuclear Decommissioning Authority and discussions about geological disposal with Radioactive Waste Management Ltd.

Legacy and subsequent developments

Although its primary projects were suspended, Horizon influenced site development preparatory work on Anglesey and Oldbury-on-Severn and informed policy debates that affected subsequent proposals by EDF Energy and successors in UK nuclear new build. Databases of environmental surveys, community consultation records and planning documentation compiled by Horizon have been referenced by later developers and public bodies including Welsh Government and Department for Business, Energy and Industrial Strategy. The corporate withdrawal highlighted challenges faced by international bidders such as Toshiba at Wylfa Newydd and contributed to UK discussions that led to alternative approaches embracing small modular reactors championed by companies like Rolls-Royce (engineering) and projects backed by Centrica-style investors.

Category:Energy companies of the United Kingdom Category:Nuclear power companies of the United Kingdom