Premiums are going up significantly for insurance plans sold through Covered California, the state-run insurance exchange set up through the Affordable Care Act.

The 1.4 million Californians enrolled in the system will see their monthly rates rise by an average of 13.2 percent next year. That's a stark contrast to the first two years of the ACA, when California was able to hold insurers to 4 percent annual increases.

Thirteen percent is far lower than many of the proposed premium hikes that insurers around the country are submitting to state insurance commissioners and the federal regulators for next year. Blue Cross Blue Shield plans in Tennessee, Texas and Oklahoma are asking for increases of 63 percent, 60 percent and 49 percent, respectively.