Sweden’s New Nuclear Push: Four BWRX‑300 SMRs to Deliver 1.2 GW by Mid‑2030s

Sweden is quietly laying the groundwork for a modest yet significant nuclear revival. Instead of chasing a single giant reactor, the country has signed on for four BWRX‑300 small modular reactors (SMRs) that together would generate roughly 1.2 GW of electricity – enough to power about a million homes.

The move is being shepherded by Studsvik, the Swedish nuclear specialist, which has invited two heavyweight partners into the mix: GE Vernova Hitachi Nuclear Energy for the reactor design and licensing, and Samsung C&T to handle the heavy‑lifting of construction and engineering. Together they hope to turn a complex, capital‑intensive endeavour into a repeatable, “plug‑and‑play” model that could be copied across Europe.

Two sites are on the table. One is the existing licensed nuclear complex in Nyköping, a place that already hosts a research‑grade facility. The other is a fresh proposal at Valdemarsvik, where an application was filed earlier this year. Whichever location wins the final nod, the four‑unit plant is slated to start feeding power into the grid by the mid‑2030s – a timeline that feels ambitious, but not impossible, given Sweden’s recent regulatory tweaks.

In 2026 Sweden loosened its nuclear siting rules, allowing new builds outside the three historic plant locations. The change also opens the door to a state‑backed financing framework that combines loans with two‑way contracts for difference, tools meant to de‑risk the massive upfront costs that usually scare investors away.

The BWRX‑300 itself is a 300 MWe boiling‑water design that strips away a lot of the complexity found in traditional reactors. Its “simplified architecture” promises shorter construction periods and lower capital outlays. GE Vernova claims that lessons learned from Canada’s Darlington New Nuclear Project are already feeding into the BWRX‑300, nudging it closer to a fleet‑scale reality.

Studsvik will take charge of permitting, environmental assessments and community outreach – the kind of groundwork that often makes or breaks a project. Meanwhile, GE Vernova Hitachi will provide the core reactor design, licensing support and cost modelling, and Samsung C&T will bring its global construction know‑how to the table. A joint venture, backed by DS Investment Partners and advised by GE Vernova Financial Services, will handle financing, ownership and eventual operation.

Why four reactors? The partners see the quartet as a pilot‑line, a way to iron out any kinks before scaling up. Early‑stage learning could trim construction schedules, shave costs and even nurture a Swedish supply chain that feeds engineering, procurement and long‑term maintenance.

If all goes well – and that’s a big “if” – the first ReFirm SMR could become Sweden’s first brand‑new nuclear source in decades, marking a subtle but meaningful shift toward a low‑carbon energy mix that still respects the country’s strong nuclear heritage.

So, while the headlines may not scream “nuclear boom,” the quiet, methodical progress of these four BWRX‑300 units could well be the steady hand that steadies Europe’s green‑energy future.