The task of giving exemptions to aspects of Obamacare company by company might have proved to be to time consuming for the Department of Health and Human services so they are issuing state by state. See here.
The state of Maine was given a waiver,good for three years,exempting health care insurers from the requirement that they spend at least 80% of premium fees on actual patient care. In Maine, at least for a while, 65% will suffice.
Earlier Maine's secretary of insurance has expressed concern that one company,Healthmarkets,Inc, would drop coverage for policyholders and leave the state.See here for some background on that company .