Vattenfall builds a 130 kV substation near Nyköping for a 120 MWp solar park due to be energised in December

Distribution system operator Vattenfall Eldistribution announced on Thursday, 5 November, that the new 130 kV regional grid substation at Fjällskär, outside Nyköping in the province of Södermanland, is complete. It was built to connect the solar park being developed by Primora, formerly Svea Solar’s solar park business, which the company describes as Sweden’s largest.

The figures. According to the press release, the park covers about 130 hectares, has an installed capacity of around 120 MWp and is expected to produce up to 120 GWh a year, equal to the annual consumption of about 6,000 houses. The connection is sized for 100 MW, while the subscribed capacity is 84 MW, Solenerginyheter reports. The park is almost six times larger than the one the company already operates in the area.

The works. The substation receives power from the park at 30 kV and steps it up to 130 kV before feeding it into the regional grid. The project included a building for control equipment and reinforcement of the lines towards Minninge and Hedenlunda, and the substation was designed so that it can be expanded later. “When we invest in and strengthen the grid, more new generation can be connected and benefit society,” said Cecilia Zetterström, head of Customers and Connections at Vattenfall Eldistribution. Giorgio Gallettini, Grid Integration Manager at Primora, said the new transformer station brings “a large addition of renewable electricity in central Sweden”.

Background. Primora became a standalone company this year after securing new funding; its majority owner is the investment firm Altor. The company reports 220 MW of solar in operation or under construction and aims for annual output of about 2 TWh in the early 2030s, according to Solenerginyheter. In October, Primora had given a capacity of 117 MW for the Nyköping park.

What next. The substation is due to enter service in November 2026, and the solar park is to be energised in December.

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