Planning permission has been granted for Scout Moor two - creating England's largest onshore wind farm.
Peel Energy and United Utilities will build a further 16 turbines in addition to the existing 26 turbines at Scout Moor One, on land between Rochdale and Rossendale.
Rochdale Borough Council gave the go-ahead for the final stage of the two wind turbines that sit within their boundary at a meeting on Monday this week. Rossendale Borough Council's development control committee approved the other 14 on 1 September.
Scout Moor wind farm opened in 2008. Rossendale Borough Council said the proposals will generate renewable energy for over 21,000 homes and will bring in excess of £11m to the economy of to the sub regional area.
The development would be operational for a period of 25 years from the date electricity is first exported to the grid.