1. July 2010 Web Browser Compatibility Trey Felton Manager, IT Administration

2. 2 Browser Standard Timeline  ERCOT currently supports IE 6 and IE 7  Other browsers are compatible, but not supported (slide 3-4)  ERCOT will update the browser compatibility matrix by October 1 st and post to Ercot.com (slide 5)  ERCOT will not make system changes to support IE 8 prior to the completion of Nodal stabilization  Current efforts underway to test compatibility of systems with IE 8 and these results will be published with the browser compatibility matrix  4 th Quarter 2011 targeted for a move to an IE 8 browser standard  Pending analysis of system changes required

3. 3 Current Browser usage (Ercot.com)

4. 4 Internet Explorer breakdown

5. 5 Browser Matrix snapshot