Transformer replacements at Darlington Nuclear set to ensure reliable delivery of clean power

At OPG’s Darlington Nuclear Generating Station, first-of-a-kind work is underway to replace key transformers responsible for delivering the station’s clean power to Ontarians.

As part of the station’s ongoing refurbishment, this latest overhaul project aims to install new Main Output Transformers (MOT) and Unit Service Transformers (UST) at each of Darlington’s four units.

The MOT steps up the voltage of the electricity generated at Darlington so that it can be safely transmitted to the grid. Meanwhile, the UST steps down the voltage to help power auxiliary systems at each Darlington unit.

With more than 25 years of in-service time, Darlington’s transformers are approaching their end of life. The project to replace them is the first of its kind for the station and for OPG.

“These transformers are the final piece of the puzzle for the Darlington station,” said Teodora Tasic, a Technical Engineer with OPG’s Nuclear Projects division. “They ensure the electricity generated here can be transmitted throughout Ontario and to the station to support important auxiliary systems.”