Assuming you are asking about the exchanges for individual health insurance (vs. small business health insurance), NC elected NOT to set up their own exchange. Residents of NC who wish to purchase insurance on an exchange will default to the Federal Exchange. A nice summary is here:
North Carolina Health Insurance Exchange Guide
However, due to the archaic, ridiculous state insurance laws (which were the first things that should have been dumped in the Affordable Care Act, IMHO), residents of NC will only a few choices of coverage. Only BCBS, Coventry and FirstCarolina Care have submitted plans (but they may not be available in ALL counties). Aetna, Cigna, United Health Care have decided against submitting plans for individual coverage.
Few insurance carriers to participate in NC health insurance exchange - Greensboro - The Business Journal
This lack of competition, combined with certain ACA requirements that do not allow insurance companies to offer high-deducible plans, will
reduce the our choices for coverage.
NC is a relatively low cost state for health insurance premiums. The cost for younger, health individuals will almost certainly go up. For older and unhealthy adults who already have low deductible plans, premiums may decrease IF those people qualify for the government subsidy. Those individuals with high deductible plans (>$5,000) will see thier premiums increase.
But not to worry: The White House will probably be forced to postpone the implementation of the Federal Exchange until October, 2014, since they are unlikely to get the details resolved in time for October, 2013 implementation.
Feds may miss fall deadline for insurance exchanges in N.C. - Greensboro - The Business Journal