Wales' biggest onshore windfarm is set to provide enough electricity to power 15% of Welsh households.
There are 76 turbines at the £365 million site built between Neath and Aberdare.
Vattenfall said that 52% of its £400n investment to build the Pen y Cymoedd Wind Energy Project has gone to businesses in Wales, securing work for more than 1,000 workers in Wales over the past three years.
During construction, more than 1,000 workers from Wales helped build the wind farm.
For the next 20 years or more, Pen y Cymoedd will employ 23 skilled wind farm technicians and support staff from the local workforce.
- Watch the report from Mike Griffiths below: