There are no "ACA" premiums, and the ACA is not insurance, it is regulation. Insurance policies have been rising forever, and will continue to do so, because health care in the US is expensive.Well of course premiums have been "rising" (more like skyrocketing) for the past 15-20 years, but premiums under the ACAwill rise substantially in the next couple of years as its initial revenue projections are ironed out (articles regarding its faulty, as in overly optomistic, revenue projections date back to before its inception). I've been expecting rising ACA premiums for some time. For this reason (among others), I am glad I do not have to depend on the ACA for pre-Medicare insurance. I am not against the ACA, just happy not to rely on it.
State exchanges that have many options, such as Florida, have seen some insurers (like BCBS) increasing rates each year by 20% - 30%, while others (Humana) for the same coverage and similar networks have seen much lower increases. It is impossible to generalize, as each insurer is acting differently.