(RALEIGH) -- In states that already have a developed wind industry, the questionable future of the Wind Production Tax Credit, which offers 2.2 cents per kilowatt hour back to energy producers, is prompting a slowdown. This isn't the first time that the future of the credit has been in question.

John Wojciechowski is a lead instructor in sustainable technologies at Cape Fear Community College. He says that makes it difficult for industries to invest.

"Just kind of schizophrenic start and stop - that uncertainty is a direct impact to the industry because the industry thrives on certainty."

Two major wind farms have been approved for eastern North Carolina, but without the production tax credit, Wojciechowski says it would be unlikely for them to proceed.