Over a dozen of the cooperative health insurers that started under the Affordable Care Act (ACA) have failed, but leaders of Connecticut’s co-op say it is on track to turn a profit next year. “We’re very viable,” said Ken Lalime, CEO of Wallingford-based HealthyCT, a member-run, nonprofit health insurance co-op. “There are a lot of stable pieces of” HealthyCT. The co-op is enduring when others have died off, he said, by strategically adapting to changes in the ACA, and diversifying its portfolio. About a third of its business is insuring individuals, a third is small group policies and a third is large group insurance policies, he said.