Ian Malcolm, managing director of ElringKlinger (GB), said: "In 2012 we set out plans to double our turnover to £26m in five years and this has already been achieved. "Being in business for 50 years is a significant milestone for us and one we have looked forward to celebrating for some time now so it makes sense to set ourselves another target, as we celebrate the success achieved so far. "Both the site extension and new turbine demonstrate our serious commitment to supporting the North East's manufacturing industry.