Industriens Pension has emerged as the largest single backer of Hermes Investment Management’s acquisition of a 17% stake in UK utility Southern Water.

The Danish pension provider contributed DKK1.1bn (€147m) to the deal, which came about after the Future Fund, Australia’s sovereign wealth fund, .

Kasper Struve, the provider’s director of private investments, confirmed the acquisition.

“Yes, it’s correct that we have invested roughly £120m (€155m) in Southern Water as a client of existing shareholder Hermes,” he said.

“It is a sizeable and important investment for us, and it is a sector we have followed for a number of years. Southern Water is a high-quality piece of UK infrastructure.

“We are happy to gain exposure and plan to hold the investment long term.”

Struve declined to say how large a stake in Southern Industriens had acquired for its DKK1.1bn contribution, but it is thought the provider is Hermes’s single-largest backer.

The last full sale of Southern, in 2007, saw Royal Bank of Scotland offload the company for £4.2bn to a group led by JP Morgan.

As a result, Industriens has grown its infrastructure holdings to 10% of assets under management, including stakes in offshore wind, hospitals, solar power stations and container terminals.

Detailing the provider’s strategy, which saw it , Struve said: “Direct investments are something we do in the core space – in addition to Southern Water, we have so far invested in seven PPP projects and two offshore wind parks.”

Its other UK exposure includes a co-investment in the UK’s Central Area Transmission System, a gas pipeline and a gas terminal in the North Sea maintained by Wood Group on behalf of Antin Infrastructure Partners. In 2015, Antin acquired a 62% stake for £302m.

It also includes an indirect stakes in the public/private partnership to build London’s Thames Tideway Tunnel, , and Angel Trains, in which .