You can find ERCOT Operations Messageshttp://www.ercot.com/services/comm/mkt_notices/opsmessages
From what I understand generation/transmission/distribution are all affected to different degrees.

On Fuel Mix Report: 2021, wind was 25% by GWh for 2021 January, current it is ~9%

http://www.ercot.com/gridinfo/generation
http://www.ercot.com/content/cdr/html/real_time_system_conditions.html  (DC Tie is non-synchronize connection to other grids)


>Market Participants that own or operate facilities that are part of the Bulk Electric System, as defined in federal law, are subject to oversight by the Federal Energy Regulatory Commission (FERC), the North American Electric Reliability Corporation (NERC), and Texas Reliability Entity, Inc. (Texas RE).

http://www.ercot.com/mktrules/compliance

ERCOT is subject to (federal) NERC Reliability Standards, but not interstate transmission regulations.
Only generation and retail electric providers are deregulated. Transmission and distribution are not. Municipally owned utilities and electric coop in ERCOT region are exempt from unbundling (from vertically integrated monopoly).