It’s a matter of capacity. ERCOT only has 1220 MW of interconnection capacity across 4 asynchronous links [1]. Compare this to e.g. California ISO which seems t

It’s a matter of capacity. ERCOT only has 1220 MW of interconnection capacity across 4 asynchronous links [1]. Compare this to e.g. California ISO which seems to have about 10,000-15,000 MW of synchronous interconnection capacity [2]. Neither is adequate to fully support historic peak demand in the system [3-4], but California has much more flexibility in emergencies. [1] https://www.ercot.com/files/docs/2020/07/30/ERCOT_DC_Tie_Operations_Document.docx https://www.ercot.com/files/docs/2020/07/30/ERCOT_DC_Tie_Ope... [2] http://www.caiso.com/Documents/ISOMaximumResourceAdequacyImportCapabilityforYear2021.pdf http://www.caiso.com/Documents/ISOMaximumResourceAdequacyImp... [3] https://www.caiso.com/documents/californiaisopeakloadhistory.pdf https://www.caiso.com/documents/californiaisopeakloadhistory... [4] https://www.ercot.com/files/docs/2022/07/20/ERCOT%20Monthly%20Operational%20Overview%20June%202022.pdf https://www.ercot.com/files/docs/2022/07/20/ERCOT%20Monthly%...