Some ERCOT applications work best in a certain browser. Here are the preferred browsers for each application.

Internet Explorer 8*:

*Since the new MIS does not function as intended on Internet Explorer versions 8 or older, you may find it convenient to enable Compatibility Mode locally in the browser or Enterprise Mode with group policies. Compatibility Mode can only be set at the domain level (e.g.,

Internet Explorer 11:


Chrome or Edge

Chrome or Internet Explorer:

NMMS PTC – Neither Chrome nor Internet Explorer is used as it is its own application.