BOISE, Idaho (AP) — Idaho insurance exchange leaders may hike a fee on individual policies by as much as 75 percent within two years, according to emails indicating the existing assessment could be insufficient to sustain the Internet marketplace's operations.

The Your Health Idaho exchange opened last week, with the website disrupted by heavy traffic from potential enrollees. The exchange now charges a 1.5 percent assessment on policies, to build operational reserves. But in early September, exchange finance chief Pat Kelly planned to announce that fee could be boosted to 2.6 percent by 2016.

That's when the federal government requires Idaho's exchange to be self-sustainable. Kelly's presentation was scuttled, however, a decision exchange director Amy Dowd recalled on Thursday came after concluding it was based on calculations too preliminary to make public just yet.