Not sure how this slipped by me earlier today...I've been so busy trying to figure out the 2016 rate increases for each state that I missed this report from HHS about the 2015 premium and competition changes at Healthcare.Gov (this doesn't include the state-based exchanges, but still covers 2/3 of the states and 3/4 of total private enrollments):
Competition and Choice in the Health Insurance Marketplace Lowered Premiums in 2015
The Health Insurance Marketplace established by the Affordable Care Act allows consumers to compare health insurance plans based on key factors, such as covered services, providers, and importantly, price. According to a report released today, choice and competition increased in the 2015 Marketplace and consumers benefitted as new issuers entered and price competition intensified. In 2015, 86 percent of Marketplace-eligible consumers could choose from at least three issuers, up from 70 percent in 2014.