Orica takes FID on Hunter Valley Hydrogen Hub, integrating electrolysis into its Kooragang Island ammonia site

Orica has announced a final investment decision to proceed with the Hunter Valley Hydrogen Hub (HVHH), a commercial-scale renewable hydrogen production facility integrated with its existing ammonia manufacturing complex at Kooragang Island in New South Wales, Australia.

The July 1 announcement commits Orica to a facility producing around 4,700 tonnes per annum of renewable hydrogen from recycled water and renewable electricity — enough to make approximately 26,600 tonnes of low-carbon ammonia per year and displace about 7.5 per cent of the site’s natural gas feedstock demand. Construction is scheduled to begin in 2026, with first production targeted for early 2029. Capital expenditure is expected in the range of A$245–283 million across 2026–2029, net of government funding; the project is backed by the Australian and New South Wales governments and the Australian Renewable Energy Agency (ARENA).

Why brownfield hydrogen is the harder study

On paper HVHH is a modest electrolyser project. What makes it interesting from a process safety standpoint is where it sits: inside the fence of an operating ammonia manufacturing facility, feeding directly into existing synthesis infrastructure.

That integration shapes the safety-study pipeline in ways a greenfield hydrogen plant of the same capacity would not. The electrolysis and compression package brings the now-familiar hydrogen hazard set — wide flammability range, low ignition energy, high-pressure gaseous storage — but the tie-ins are where the concentrated PHA effort tends to land: hydrogen delivery into a live ammonia flowsheet, allocation of relief and vent capacity across new and existing systems, and the interaction between a variable renewable-powered electrolyser and a synthesis loop designed around steady reformer hydrogen.

Construction on an operating site adds its own layer. A 2026–2029 build alongside running ammonia production implies simultaneous-operations reviews, construction-phase risk assessments, and management-of-change discipline at every tie-in window.

Orica says the facility will be constructed by specialised contractors using established technology deployed at scale internationally — which is true of the electrolyser itself, but the site-specific integration questions are precisely the ones that generic technology experience does not answer. Expect design-stage HAZOPs, hydrogen-specific hazard reviews, and SIL determination work to be contracted through the FEED-to-detail-design window over the coming year, with revalidation implications for the existing plant’s PHAs as the interfaces firm up.

Project details are available in Orica’s HVHH factsheet.