The contract will deliver 53GWh of renewable electricity each year to 400 sites nationwide.
The POWER project builds on Bramble’s existing technology.
The Windanker project requires a €1bn investment, with operations set to begin in 2026.
The project is supported by the ongoing Grid Connection Reform and Clean Power 2030 plan.
Oconee is the first of the company’s nuclear facilities to achieve this milestone.
The plant is set to be completed at the end of 2027.
The upgrade programme will be carried out over the next few years.