1、TROLIE:OPEN-SOURCE STANDARD FOR TRANSMISSION FACILITY RATING EXCHANGETory McKeag Principal Software Architect,markets products,GE Vernova LFE Summit North America 2025 Montreal October 3,2025 2025 GE Vernova and/or its affiliates.All rights reserved.The problem:No Standard to support FERC order 881N
2、o standard exists!2025 GE Vernova and/or its affiliates.All rights reserved.2881 in a nutshell:From static/seasonal to Ambient Adjusted Ratings(AAR)From couple of times a year to every hourReal time&10 days forecast ratingsExchanges within the ecosystem for operations&history and tight deadlines!The
3、 4 Cs challengesCommunication?Coordination?Conventions?Cybersecurity?An Interop StoryIsobel Isobel is an ISOISO.Rita Rita is anRTORTO.Owen Owen is a Transmission Owner.Owner.Remy Remy is aREMC.REMC.OpalOpal is a Transmission Operator.Operator.Rich Rich is a non-FERC jurisdictionalRCRC.3An Interop st
4、oryRemy(REMC)submits the most limiting ratingsof their owned equipment to Rita(RTO)Rich(RC)submits ratingsto Isobel(ISO)Owen(TO)delegates theirratings obligation to Opal(TOp)Opal(TOp)submits ratings toRita(RTO)Isobel(ISO)and Rita(RTO)need to exchange the most limiting facility ratings from their reg
5、ion to determine the most limiting global ratingThe simplest use caseRitas(RTO)responsibilities includeUse real-time,forecast and seasonal ratings from Opal in operational decisions(EMS,markets,outage coordination,planning,etc.)Potentially determine limits based on stability analysis.Opals(TOp)respo
6、nsibilities includeCompute real-time and forecast ratings at least hourly for use in operations,determine seasonal ratings,and share all with Rita.Use the same limits as Rita in operations.4Complexity added by Vendor LandscapeVendor 1makes EMS and market softwareVendor 2makes EMS and outage manageme