The world’s largest crane, Big Carl, lifted Hinkley Point C’s second nuclear reactor into place on June 1, 2026, marking a milestone in the UK’s largest nuclear project. The 13-meter-long reactor pressure vessel was rotated upright and lowered onto a support ring with just 40mm clearance, a feat achieved through innovation and lessons from the first reactor’s construction. EDF Energy, which owns the Somerset plant, reported Unit 2 is 20-30% faster than Unit 1, with more materials in place and advanced structural work completed.
Big Carl’s Role in Redefining Nuclear Construction
Big Carl, a 250,000 tonne-metres land crane, replaced the temporary overhead lifting system used for the first reactor, streamlining the process and reducing on-site disruption. The vessel was slid along rails through a side hatch into the reactor house before being rotated and lowered. This method, described by EDF as “not just a cut and paste” from Unit 1, allowed for greater efficiency. “We’re applying lessons to put Unit 2 well ahead of the first unit’s position at the equivalent stage,” said Simon Parsons, Hinkley Point C’s Delivery Director. Construction Index highlighted the crane’s capacity as a critical factor in the operation.
The installation followed the placement of the second reactor’s steel dome less than a year prior, a step that EDF noted “significantly advanced” the project. Unlike Unit 1, where three major heat exchangers were installed later, Unit 2 already features all three at this stage. “More equipment has been installed, additional structural steelwork completed, and the outer containment layer in place,” Construction Enquirer reported, underscoring the project’s accelerated timeline.
Lessons from the First Reactor: Innovation and Efficiency
EDF credited the 20-30% speed boost to “innovation and the experience of building an identical design with the same teams.” The first reactor’s installation relied on a temporary overhead system, which required extensive site work. By contrast, Big Carl’s use minimized temporary structures, saving time and cost. “This marks a tremendous achievement by the entire team,” Parsons said, emphasizing the coordination among 10 main contractors. ITVX noted that the reactor’s pressure vessel now powers the world’s largest turbines, the Arabelle, which will generate electricity for six million homes.
The efficiency gains extend beyond construction. EDF highlighted that the experience from Hinkley Point C will inform the upcoming Sizewell C project, a next-generation reactor. “The lessons from Hinkley will further benefit work on the UK’s next gigawatt-scale reactor,” the company stated. This alignment suggests a broader shift in nuclear infrastructure planning, prioritizing repeatable processes and technological refinement.
What This Means for the UK’s Energy Transition
The completion of Unit 2’s reactor placement accelerates the UK’s transition away from fossil fuels. EDF estimates the two reactors will cut reliance on imported energy, providing “reliable, low carbon electricity” around the clock. However, the project has faced scrutiny over costs and delays, with critics questioning whether the timeline adjustments justify the investment. Construction Enquirer noted that the 20-30% speed increase is still below the 50% target set in earlier planning stages, leaving room for further optimization.
The use of Big Carl also signals a trend in large-scale infrastructure projects: leveraging specialized machinery to overcome logistical challenges. While the crane’s size and complexity required months of planning, its success could influence future nuclear builds globally. “This is a model for how to balance innovation with precision,” said an anonymous industry analyst quoted in Construction Index. The next phase will focus on installing remaining components, with completion of Unit 2 expected by 2027.
Looking Ahead: Challenges and Opportunities
Despite the progress, Hinkley Point C remains a focal point for debates over nuclear energy’s role in the UK’s net-zero goals. Environmental groups have praised the project’s potential to reduce emissions, while opponents argue that funds could be better directed toward renewable sources like wind and solar. EDF maintains that nuclear provides “baseload power” that renewables cannot yet match, a claim supported by the reactor’s capacity to operate continuously.
The coming months will test whether the efficiency gains seen in Unit 2 can be replicated in future projects. With Sizewell C in the pipeline, the lessons from Hinkley Point C will be critical. For now, the successful reactor lift underscores the project’s significance as both a technical achievement and a political gamble. As Parsons noted, “This is a testament to the dedication of the team and the importance of learning from every challenge.”