On a visit to the plant Mr Jones saw the first wind turbine towers being loaded for transportation to wind farms in Yorkshire.
Mabey Bridge's investment in the site will create 240 jobs in the renewable energy sector.
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During the visit, the First Minister said: "This impressive facility is a massive show of confidence in Wales as a base for major manufacturing. This is a significant day for the Welsh renewables sector and the product being made here is world-class. These are highly skilled green jobs that will make a huge contribution to our economy.
"The Welsh Government is determined to make the most of the economic opportunities being created through the drive for cleaner, greener energy making sure our workforce and economy benefits from the growing renewable energy market."
(CD/BMcC)
