Alternative To Non-Modeled Generator Definition

Alternative to Non-ModeledGenerator definitionDecember 2017

Background This presentation discusses concepts ERCOT has beenworking on to address the issues that were originally thefocus of ERCOT-sponsored NPRR190, Clarification ofResource Definitions and Resource Registration of SelfServe Generators for Reliability Purposes.– ERCOT staff withdrew NPRR190 on August 17, 2015 andprovided notice that we were working on a subsequentNPRR.This concept is intended to:– Provide context for the RTF on discussions ERCOT has hadin replacing the Non-Modeled Generator term.– Provide ERCOT with the technical information andcapabilities needed to assess and maintain the reliability ofthe power system, and yet; Avoid imposing unnecessary requirements on generators thatdo not participate in the ERCOT markets.PUBLIC

Reason for the modification RTF has the task of considering how to replace andimprove Resource terms used today. ERCOT has been discussing how generators that areelectrically connected to the power system have similarphysical effects on that system regardless of the:– ownership of the generator;– ownership of the interconnecting facilities;– metering arrangements or;– participation (or not) in the wholesale power market.PUBLIC

Current definition (Protocol Section 2.1)PUBLIC4

Resource Definition FrameworkPUBLIC

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Revise terminology for resources in the ERCOTsystems: Revised nomenclature Old Nomenclature Generation Resource Generation Resource (no change)PUBLIC Non-modeledGenerator New term(s)– Transmission connected– Distribution connected Unregisteredgenerator Microgenerator? (see PUCT defs) (DistributionconnectedGeneration 10MW) Generation Resource?

Some Examples The following pages illustrate a few simplistic examples of Generators. In each example, Generators that are owned by different companiesare shown in different colors. Transmission voltage elements are shown in green and blue;distribution voltage elements and/or PUN-owned transmission areshown in gray.PUBLIC

Examples of Transmission Connected Resources100MWTraditional Generation Resourcewith POI to transmission9.9MW 10 MW Generator with POI to transmissionPUBLIC

Examples of PUN Resources100MW100MW150MWPUN with gens 10MW9.9MW4MW9.9MW5MW20MWPUN with Aggregation of gens 10MW1MWPUN with no single generator or aggregation 10MWPUBLIC

Examples of Distribution Connected Resources1MW9.9MW8MWGenerator 10MW on Distribution Systemnot in SCED or AS MarketAggregation of gens at commonService Delivery Point 10MW9.9MW 10MW9.9MWMultiple gens 10MW on Distribution Systemwith different Service Delivery PointsGenerator 10 MWon Distribution SystemNote: Unregistered Generator 1 MW on Distribution System not shownPUBLIC

Summary (continued) All-Inclusive Generation Resources (comprised of GenerationResources and Non-Modeled Resources) must meet existingdesignated technical and data provision requirements(“Technical Requirements”). Generation Resources must also meet additional qualificationrequirements depending on the “Services” they are providing: Example – Additional requirements to be qualified for providingBlack Start ServicesPUBLIC

“Technical Requirements”(Required for All-Inclusive Generation Resources, including LPGs*)*PUBLIC** Term used as part of the original NPRR190-for example only

“Market Requirements”(Required only for Generation Resources)– COPs– Offer curves– Following Base Points– Dispatch Instructions outside of Emergency conditions– Etc.This is not a comprehensive list of the MarketRequirements for Generation Resources.The rules should not change any requirements forGeneration Resources, so sections of the Protocolsrelated to requirements exclusively for GenerationResources should not change for this effort.PUBLIC

Points brought up during discussions forconsideration in future NPRRs All transmission connected resources would be required to be registered andmodeled, regardless of size. A self-generator may be registered as an Non-modeled even though it mightoccasionally produce more than 10 MW net output for payment during anERCOT-declared Emergency.– ERCOT would review output and determine if a generator is exceeding thethreshold and should subject to registering as a Generation Resource. Any resource that wants to participate in Ancillary service market or SCED isrequired to register as a Generation Resource. Existing resources that are not currently registered, but might be required toregister under any proposed requirements and choose to register as Nonmodeled generators, may be grandfathered if they cannot meet specific“Technical Requirements” (reactive, governor).PUBLIC

provided notice that we were working on a subsequent NPRR. Background This concept is intended to: – Provide context for the RTF on discussions ERCOT has had in replacing the Non-Modeled Generator term. – Provide ERCOT with the technical information and capabilities needed to assess and maintain the reliability of the power system, and yet;