- Seagreen Wind Energy Limited, developing the project, is a 50/50 joint venture between SSE and Fluor Limited, the British operating arm of Fluor Corporation.

- The project initially received planning consent in 2014.

- "Since 2014, offshore wind technology has advanced significantly with larger and more efficient turbines able to generate additional power," SSE said.

- The cost of producing electricity from wind farms has plummeted in the past few years, with the latest renewable auction clearing last year at a low of 57.50 pounds ($76) per megawatt hour (MWh).

- If built, the project would be capable of generating enough electricity to power up to 670,000 homes, SSE said.

- The next contracts-for-difference (CfD) subsidy auction will take place in spring 2019.

- Under the CfD scheme, winning projects are guaranteed a minimum price at which they can sell electricity.

(Reporting By Susanna Twidale; Editing by Edmund Blair)