System Parameters

This section describes the interface used to retrieve the most recent Energy management System (EMS) System Parameters. The result set will hold the near real time values available from EMS.

These Real-Time summaries are also available to ERCOT operators and all Market Participants using the MIS and ICCP, giving updates of calculations every ten seconds, which show the Real-Time total system amount of:

Current ImplementationRTC+B Implementation

Responsive Reserve Capacity from Generation Resources

Responsive Reserve Capacity from Load Resources excluding Controllable Load Resources

Responsive Reserve Capacity from Controllable Load Resources

Unprocured Additional Capacity from Load Resources excluding Controllable Load Resources

Responsive Reserve Capacity from Deployed Generation Resource and Controllable Load Resources

Responsive Reserve Responsibility from Generation Resource

Responsive Reserve Responsibility from Load Resources excluding Controllable Load Resources

Responsive Reserve Responsibility from Controllable Load Resources

Non-Spinning Reserve Capacity available from On-Line Generation Resources with Energy Offer Curves

Non-Spinning Reserve Capacity available from undeployed Load Resources

Non-Spinning Reserve Capacity available from Off-Line Generation Resources

Non-Spinning Reserve Capacity available from Resources with Output Schedules

Non-Spinning Reserve Responsibility from On-Line Generation Resources with Energy Offer Curves

Non-Spinning Reserve Responsibility from On-Line Generation Resources with Output Schedules

Non-Spinning Reserve Responsibility from Load Resources

Non-Spinning Reserve Responsibility from Off-Line Generation Resources excluding Quick Start Generation Resources

Non-Spinning Reserve Responsibility from Quick Start Generation Resources

Undeployed Reg-Up and undeployed Reg-Down

Deployed Reg-Up and deployed Reg-Down

Regulation Responsibility Reg-Up and Reg-Down

Available capacity from Controllable Load Resources available to decrease Base Points (energy consumption) in SCED

Available capacity from Controllable Load Resources available to increase Base Points (energy consumption) in SCED

Available capacity with Energy Offer Curves in the ERCOT System that can be used to increase Base Points in SCED

Available capacity with Energy Offer Curves in the ERCOT System that can be used to decrease Base Points in SCED

Available capacity without Energy Offer Curves in the ERCOT System that can be used to increase Base Points in SCED

Available capacity without Energy Offer Curves in the ERCOT System that can be used to decrease Base Points in SCED

Available capacity to increase Generation Resource Base Points in the next 5 minutes in SCED (HDL)

Available capacity to decrease Generation Resource Base Points in the next 5 minutes in SCED (LDL)

The ERCOT-wide Physical Responsive Capability (PRC)

Real-Time On-Line Reserve Capacity

Real-Time On-Line and Off-Line Reserve Capacity

Total FFR computed by summing FFR MW from ONFFRRRS resource

Total FFR Capacity computed by taking resource limits into account

Contingency Reserve Capacity from Generation Resources

Contingency Reserve Capacity from Load Resources excluding Controllable Load Resources

Contingency Reserve Capacity from Controllable Load Resources

Contingency Reserve Capacity from Quick Start Generation Resources

Contingent Reserve Responsibility from Generation Resources

Contingent Reserve Responsibility from Load Resources excluding Controllable Load Resources

Contingent Reserve Responsibility from Controllable Load Resources

Contingent Reserve Responsibility from Quick Start Generation Resources

Contingency Reserve Capacity from Deployed Generation Resources and Load Resources

Message Element Description

rrcGenRes Responsive Reserve Capacity (RRC) from Generation Resources

rrcLoadResWoClr RRC from Load Resources excluding Controllable Load Resources

rrcUnprocuredL This field will be removed

rrcClr RRC from Controllable Load Resources

Ffrrrscp Resources capable of Fast Frequency Response

Esrffrct RRS Capability from ESRs providing FFR

rrAwardGn Responsive Reserve Awards Generation Resource

rrAwardNCL Responsive Reserve Awards Load Resources excluding Controllable Load Resources

rrAwardCL Responsive Reserve Awards Controllable Load Resources

ffrrtAward Responsive Reserve Awards Resources capable of Fast Frequency Response

ecrsCapacityGN ECRS Capability from non-Quick-Start generation and ONSC ECRS

ecrsCapacityNCL ECRS Capability from NCLRs

ecrsCapacityCL ECRS Capability from CLRs

ecrsCapacityQS ECRS Capability from Quick-Start generation

ecrsCapacityESR The sum of ECRS Capabilties of individual ESRs that can be sustained for the SCED duration requirements of ECRS

Monecrqt sum of all ECRS Awards minus manually deployed ECRS Schedules Capabilties for all Generation Resources with a Resource Status of ONSC

ecrsAwardGo The sum of all Real Time ECRS Responsibilities Awards from Generation Resources

ecrsAwardNCLR The sum of all Real Time RRS ECRS Responsibilities Awards from Load Resources excluding Controllable Load Resources

ecrsAwardCLR The sum of all Real Time ECRS Responsibilities Awards from Controllable Load Resources.

ecrsAwardQS The sum of all Real Time ECRS Responsibilities Awards from Quick Start Generation Resources telemetering OFFQS resource status.

ecrsAwardESR The sum of ECRS Awards of individual ESRs.

nsrOnlineGenResWoEO Non-spinning reserve available from on-line generation resources with energy offer curves

nsrOfflineResWOS Non-spinning reserve available from resources with output schedules

nsrUndeployedLoadRes Non-spinning reserve available from undeployed load resources

nsrOfflineGenRes The sum of Non-Spin Schedules Capabilties from generation resources that are offline

nsrCapESR The sum of Non-Spin Capabilties of individual ESRs that can be sustained for the SCED duration requirements of Non-Spin.

nsAWardGnWEO Non-Spin Reserve Awards On-Line Generation Reserves with Energy Offer Curves

nsAwardGnWOS Non-Spin Reserve Awards On-Line Generation Reserves with Output Schedules

nsAwardLd Non-Spin Reserve Awards Load Resources

nsAwardGnOff Non-Spin Reserve Awards Off-Line Generation Resources excluding Quick Start Generation Resources

nsAwardQSGR Non-Spin Reserve Awards Quick Start Generation Resources

nsAwardAS Ancillary Service Resources awards for Non-Spin

regUpCap Reg-Up capability

regDownCap Reg-Down capability

regUpAward Regulation Awards Reg-Up

regDnAward Regulation Awards Reg-Down

capCLRDecreaseBP Available capacity from CLRs that can be used to decrease base points in SCED

capCLRIncreaseBP Available capacity from CLRs that can be used to increase base points in SCED

capWEOIncreaseBP Available capacity with energy offer curves that can be used to increase base points in SCED

capWEODecreaseBP Available capacity with energy offer curves that can be used to decrease base points in SCED

capWOEOIncreaseBP Available capacity without energy offer curves that can be used to increase base points in SCED

capWOEODecreaseBP Available capacity without energy offer curves that can be used to decrease base points in SCED

esrCapWEOIncreaseBP Capacity with Energy/Bid Offers available to increase ESR Base Points in the next five minutes in SCED (HDL)

esrCapWEODecreaseBP Capacity with Energy/Bid Offers available to decrease ESR Base Points in the next five minutes in SCED (LDL)

esrCapWOEOIncreaseBP Capacity without Energy/Bid Offers available to increase ESR Base Points in the next five minutes in SCED (HDL)

esrCapWOEODecreaseBP Capacity without Energy/Bid Offers available to decrease ESR Base Points in the next five minutes in SCED (LDL)

capGnIncreaseBP System Available Capacity to increase Generation Resource Base Points in the next 5 minutes In SCED (HDL).

capGnDecreaseBP System Available Capacity to decrease Generation Resource Base Points in the next 5 minutes In SCED (LDL).

capResSumRegUpRRS Capacity to provide Reg-Up, RRS, or both

capResSumRegUpRRSECRS Capacity to provide Reg-Up, RRS, ECRS, or any combination

capResSumRegUpRRSECRSNS Capacity to provide Reg-Up, RRS, ECRS, or Non-Spin, in any combination

Prc Ercot-wide physical responsive capability

rtRVCapON Real-Time operating reserve demand curve capacity Online

rtRVCapOnOff Real-Time operating reserve demand curve capacity On Offline

hslTEMR Aggregate telemetered HSL capacity for Resources with a telemetered Resource Status of EMR

hslTOut Aggregate telemetered HSL capacity for Resources with a telemetered Resource Status of OUT

hslTOutl Aggregate net telemetered consumption for Resources with a telemetered Resource Status of OUTL

The request message would use the following message fields:

Message Element	Value
Header/Verb	get
Header/Noun	SystemParameters
Header/Source	Market participant ID
Header/UserID	ID of user

The corresponding response messages would use the following message fields:

Message Element	Value
Header/Verb	reply
Header/Noun	SystemParameters
Header/Source	ERCOT
Reply/ReplyCode	Reply code, success=OK, error=ERROR or FATAL
Reply/Error	Error message, if error encountered
Payload	SystemParameters

The following is an XML example for System Parameters interface:

Current ImplementationRTC+B Implementation

<ns1:SystemParameters xmlns:ns0="http://www.ercot.com/schema/2007-05/nodal/eip/il"
    xmlns:ns1="http://www.ercot.com/schema/2007-06/nodal/ews">
    <ns1:time>2023-04-19T11:59:45-05:00</ns1:time>
    <ns1:rrcGenRes>1160.73681640625</ns1:rrcGenRes>
    <ns1:rrcLoadResWoClr>1462.20471191406</ns1:rrcLoadResWoClr>
    <ns1:rrcClr>76.4300003051758</ns1:rrcClr>
    <ns1:nsrOnlineGenResWoEo>196.0</ns1:nsrOnlineGenResWoEo>
    <ns1:nsrUndeployedLoadRes>54.6940040588379</ns1:nsrUndeployedLoadRes>
    <ns1:nsrOfflineGenRes>3197.169921875</ns1:nsrOfflineGenRes>
    <ns1:nsrOfflineResWOS>559.830078125</ns1:nsrOfflineResWOS>
    <ns1:undeployedRegUp>150.734359741211</ns1:undeployedRegUp>
    <ns1:undeployedRegDown>389.0</ns1:undeployedRegDown>
    <ns1:capWEOIncreaseBP>2569.84887695313</ns1:capWEOIncreaseBP>
    <ns1:capWEODecreaseBP>3765.91967773438</ns1:capWEODecreaseBP>
    <ns1:capWOEOIncreaseBP>5760.798828125</ns1:capWOEOIncreaseBP>
    <ns1:capWOEODecreaseBP>26643.263671875</ns1:capWOEODecreaseBP>
    <ns1:prc>5997.5986328125</ns1:prc>
    <ns1:capCLRIncreaseBP>0.0</ns1:capCLRIncreaseBP>
    <ns1:capCLRDecreaseBP>3.76999664306641</ns1:capCLRDecreaseBP>
    <ns1:rrcUnprocuredL>308.591522216797</ns1:rrcUnprocuredL>
    <ns1:rrcDeployedGnCl>0.0</ns1:rrcDeployedGnCl>
    <ns1:rrRespGn>1160.90014648438</ns1:rrRespGn>
    <ns1:rrRespNcl>1478.5205078125</ns1:rrRespNcl>
    <ns1:rrRespCl>80.0</ns1:rrRespCl>
    <ns1:nsRespGnWEo>551.400024414063</ns1:nsRespGnWEo>
    <ns1:nsRespGnWOS>800.030029296875</ns1:nsRespGnWOS>
    <ns1:nsRespLd>98.0</ns1:nsRespLd>
    <ns1:nsRespGnOff>3197.17016601562</ns1:nsRespGnOff>
    <ns1:nsRespQsgr>515.830078125</ns1:nsRespQsgr>
    <ns1:deployedRegUp>206.765655517578</ns1:deployedRegUp>
    <ns1:deployedRegDown>0.0</ns1:deployedRegDown>
    <ns1:regUpResp>357.5</ns1:regUpResp>
    <ns1:regDnResp>389.0</ns1:regDnResp>
    <ns1:capGnIncreaseBp>4785.0078125</ns1:capGnIncreaseBp>
    <ns1:capGnDecreaseBp>24512.748046875</ns1:capGnDecreaseBp>
    <ns1:rtRvCapOn>18130.98046875</ns1:rtRvCapOn>
    <ns1:rtRvCapOnOff>23070.98046875</ns1:rtRvCapOnOff>
    <ns1:hslTEmr>78.0</ns1:hslTEmr>
    <ns1:hslTOut>17298.251953125</ns1:hslTOut>
    <ns1:hslTOutl>509.375915527344</ns1:hslTOutl>
    <ns1:ffrrt>0.0</ns1:ffrrt>
    <ns1:ffrrrscp>0.0</ns1:ffrrrscp>
    <ns1:ecrsCapacityGn>0.0</ns1:ecrsCapacityGn>
    <ns1:ecrsCapacityNcl>-0.000000000000748179195424347</ns1:ecrsCapacityNcl>
    <ns1:ecrsCapacityCl>0.0</ns1:ecrsCapacityCl>
    <ns1:ecrsCapacityQs>0.0</ns1:ecrsCapacityQs>
    <ns1:ecrsRespGn>0.0</ns1:ecrsRespGn>
    <ns1:ecrsRespNcl>0.0</ns1:ecrsRespNcl>
    <ns1:ecrsRespCl>0.0</ns1:ecrsRespCl>
    <ns1:ecrsRespQs>0.0</ns1:ecrsRespQs>
    <ns1:ecrsDeployed>0.0</ns1:ecrsDeployed>
</ns1:SystemParameters>

<ns1:SystemParameters xmlns:ns0="http://www.ercot.com/schema/2007-05/nodal/eip/il" xmlns:ns1="http://www.ercot.com/schema/2007-06/nodal/ews">
    <ns1:time>2025-09-04T12:23:45-05:00</ns1:time>                                                                                
    <ns1:rrcGenRes>2321.0</ns1:rrcGenRes>                                                                                         
    <ns1:rrcLoadResWoClr>101.0</ns1:rrcLoadResWoClr>                                                                              
    <ns1:rrcUnprocuredL>1402.0</ns1:rrcUnprocuredL>                                                                               
    <ns1:rrcClr>4.0</ns1:rrcClr>                                                                                                  
    <ns1:ffrrrscp>163.0</ns1:ffrrrscp>                                                                                            
    <ns1:esrffrct>163.0</ns1:esrffrct>                                                                                            
    <ns1:rrAwardGn>2564.0</ns1:rrAwardGn>                                                                                         
    <ns1:rrAwardNCL>101.0</ns1:rrAwardNCL>                                                                                        
    <ns1:rrAwardCL>4.0</ns1:rrAwardCL>                                                                                            
    <ns1:ffrrtAward>163.0</ns1:ffrrtAward>                                                                                        
    <ns1:ecrsCapacityGN>1073.0</ns1:ecrsCapacityGN>                                                                               
    <ns1:ecrsCapacityNCL>25.0</ns1:ecrsCapacityNCL>                                                                               
    <ns1:ecrsCapacityCL>12.0</ns1:ecrsCapacityCL>                                                                                 
    <ns1:ecrsCapacityQS>26.0</ns1:ecrsCapacityQS>                                                                                 
    <ns1:ecrsCapacityESR>827.0</ns1:ecrsCapacityESR>                                                                              
    <ns1:monecrqt>0.0</ns1:monecrqt>                                                                                              
    <ns1:ecrsAwardGo>1159.0</ns1:ecrsAwardGo>                                                                                     
    <ns1:ecrsAwardNCLR>27.0</ns1:ecrsAwardNCLR>                                                                                   
    <ns1:ecrsAwardCLR>12.0</ns1:ecrsAwardCLR>                                                                                     
    <ns1:ecrsAwardQS>26.0</ns1:ecrsAwardQS>                                                                                       
    <ns1:ecrsAwardESR>864.0</ns1:ecrsAwardESR>                                                                                    
    <ns1:nsrOnlineGenResWoEO>1029.0</ns1:nsrOnlineGenResWoEO>                                                                     
    <ns1:nsrOfflineResWOS>768.0</ns1:nsrOfflineResWOS>                                                                            
    <ns1:nsrUndeployedLoadRes>0.0</ns1:nsrUndeployedLoadRes>                                                                      
    <ns1:nsrOfflineGenRes>3283.0</ns1:nsrOfflineGenRes>                                                                           
    <ns1:nsrCapESR>648.0</ns1:nsrCapESR>                                                                                          
    <ns1:nsAWardGnWEO>1096.0</ns1:nsAWardGnWEO>                                                                                   
    <ns1:nsAwardGnWOS>770.0</ns1:nsAwardGnWOS>                                                                                    
    <ns1:nsAwardLd>0.0</ns1:nsAwardLd>                                                                                            
    <ns1:nsAwardGnOff>1720.0</ns1:nsAwardGnOff>                                                                                   
    <ns1:nsAwardQSGR>22.0</ns1:nsAwardQSGR>                                                                                       
    <ns1:nsAwardAS>650.0</ns1:nsAwardAS>                                                                                          
    <ns1:regUpCap>317.0</ns1:regUpCap>                                                                                            
    <ns1:regDownCap>286.0</ns1:regDownCap>                                                                                        
    <ns1:regUpAward>340.0</ns1:regUpAward>                                                                                        
    <ns1:regDnAward>351.0</ns1:regDnAward>                                                                                        
    <ns1:capCLRDecreaseBP>8.0</ns1:capCLRDecreaseBP>                                                                              
    <ns1:capCLRIncreaseBP>157.0</ns1:capCLRIncreaseBP>                                                                            
    <ns1:capWEOIncreaseBP>14387.0</ns1:capWEOIncreaseBP>                                                                          
    <ns1:capWEODecreaseBP>40568.0</ns1:capWEODecreaseBP>                                                                          
    <ns1:capWOEOIncreaseBP>11227.0</ns1:capWOEOIncreaseBP>                                                                        
    <ns1:capWOEODecreaseBP>8809.0</ns1:capWOEODecreaseBP>                                                                         
    <ns1:esrCapWEOIncreaseBP>413.0</ns1:esrCapWEOIncreaseBP>                                                                      
    <ns1:esrCapWEODecreaseBP>149.0</ns1:esrCapWEODecreaseBP>                                                                      
    <ns1:esrCapWOEOIncreaseBP>9142.0</ns1:esrCapWOEOIncreaseBP>                                                                   
    <ns1:esrCapWOEODecreaseBP>3618.0</ns1:esrCapWOEODecreaseBP>                                                                   
    <ns1:capGnIncreaseBP>14254.0</ns1:capGnIncreaseBP>                                                                            
    <ns1:capGnDecreaseBP>39178.0</ns1:capGnDecreaseBP>                                                                            
    <ns1:capResSumRegUpRRS>14616.0</ns1:capResSumRegUpRRS>                                                                        
    <ns1:capResSumRegUpRRSECRS>16582.0</ns1:capResSumRegUpRRSECRS>                                                                
    <ns1:capResSumRegUpRRSECRSNS>18599.0</ns1:capResSumRegUpRRSECRSNS>                                                            
    <ns1:prc>14520.0</ns1:prc>                                                                                                    
    <ns1:rtRVCapON>0.0</ns1:rtRVCapON>                                                                                            
    <ns1:rtRVCapOnOff>0.0</ns1:rtRVCapOnOff>                                                                                      
    <ns1:hslTEMR>489.0</ns1:hslTEMR>                                                                                              
    <ns1:hslTOut>7691.0</ns1:hslTOut>                                                                                             
    <ns1:hslTOutl>3099.0</ns1:hslTOutl>                                                                                           
 </ns1:SystemParameters>

Message Element	Description
rrcGenRes	Responsive Reserve Capacity (RRC) from Generation Resources
rrcLoadResWoClr	RRC from Load Resources excluding Controllable Load Resources
rrcUnprocuredL	This field will be removed
rrcClr	RRC from Controllable Load Resources
Ffrrrscp	Resources capable of Fast Frequency Response
Esrffrct	RRS Capability from ESRs providing FFR
rrAwardGn	Responsive Reserve Awards Generation Resource
rrAwardNCL	Responsive Reserve Awards Load Resources excluding Controllable Load Resources
rrAwardCL	Responsive Reserve Awards Controllable Load Resources
ffrrtAward	Responsive Reserve Awards Resources capable of Fast Frequency Response
ecrsCapacityGN	ECRS Capability from non-Quick-Start generation and ONSC ECRS
ecrsCapacityNCL	ECRS Capability from NCLRs
ecrsCapacityCL	ECRS Capability from CLRs
ecrsCapacityQS	ECRS Capability from Quick-Start generation
ecrsCapacityESR	The sum of ECRS Capabilties of individual ESRs that can be sustained for the SCED duration requirements of ECRS
Monecrqt	sum of all ECRS Awards minus manually deployed ECRS Schedules Capabilties for all Generation Resources with a Resource Status of ONSC
ecrsAwardGo	The sum of all Real Time ECRS Responsibilities Awards from Generation Resources
ecrsAwardNCLR	The sum of all Real Time RRS ECRS Responsibilities Awards from Load Resources excluding Controllable Load Resources
ecrsAwardCLR	The sum of all Real Time ECRS Responsibilities Awards from Controllable Load Resources.
ecrsAwardQS	The sum of all Real Time ECRS Responsibilities Awards from Quick Start Generation Resources telemetering OFFQS resource status.
ecrsAwardESR	The sum of ECRS Awards of individual ESRs.
nsrOnlineGenResWoEO	Non-spinning reserve available from on-line generation resources with energy offer curves
nsrOfflineResWOS	Non-spinning reserve available from resources with output schedules
nsrUndeployedLoadRes	Non-spinning reserve available from undeployed load resources
nsrOfflineGenRes	The sum of Non-Spin Schedules Capabilties from generation resources that are offline
nsrCapESR	The sum of Non-Spin Capabilties of individual ESRs that can be sustained for the SCED duration requirements of Non-Spin.
nsAWardGnWEO	Non-Spin Reserve Awards On-Line Generation Reserves with Energy Offer Curves
nsAwardGnWOS	Non-Spin Reserve Awards On-Line Generation Reserves with Output Schedules
nsAwardLd	Non-Spin Reserve Awards Load Resources
nsAwardGnOff	Non-Spin Reserve Awards Off-Line Generation Resources excluding Quick Start Generation Resources
nsAwardQSGR	Non-Spin Reserve Awards Quick Start Generation Resources
nsAwardAS	Ancillary Service Resources awards for Non-Spin
regUpCap	Reg-Up capability
regDownCap	Reg-Down capability
regUpAward	Regulation Awards Reg-Up
regDnAward	Regulation Awards Reg-Down
capCLRDecreaseBP	Available capacity from CLRs that can be used to decrease base points in SCED
capCLRIncreaseBP	Available capacity from CLRs that can be used to increase base points in SCED
capWEOIncreaseBP	Available capacity with energy offer curves that can be used to increase base points in SCED
capWEODecreaseBP	Available capacity with energy offer curves that can be used to decrease base points in SCED
capWOEOIncreaseBP	Available capacity without energy offer curves that can be used to increase base points in SCED
capWOEODecreaseBP	Available capacity without energy offer curves that can be used to decrease base points in SCED
esrCapWEOIncreaseBP	Capacity with Energy/Bid Offers available to increase ESR Base Points in the next five minutes in SCED (HDL)
esrCapWEODecreaseBP	Capacity with Energy/Bid Offers available to decrease ESR Base Points in the next five minutes in SCED (LDL)
esrCapWOEOIncreaseBP	Capacity without Energy/Bid Offers available to increase ESR Base Points in the next five minutes in SCED (HDL)
esrCapWOEODecreaseBP	Capacity without Energy/Bid Offers available to decrease ESR Base Points in the next five minutes in SCED (LDL)
capGnIncreaseBP	System Available Capacity to increase Generation Resource Base Points in the next 5 minutes In SCED (HDL).
capGnDecreaseBP	System Available Capacity to decrease Generation Resource Base Points in the next 5 minutes In SCED (LDL).
capResSumRegUpRRS	Capacity to provide Reg-Up, RRS, or both
capResSumRegUpRRSECRS	Capacity to provide Reg-Up, RRS, ECRS, or any combination
capResSumRegUpRRSECRSNS	Capacity to provide Reg-Up, RRS, ECRS, or Non-Spin, in any combination
Prc	Ercot-wide physical responsive capability
rtRVCapON	Real-Time operating reserve demand curve capacity Online
rtRVCapOnOff	Real-Time operating reserve demand curve capacity On Offline
hslTEMR	Aggregate telemetered HSL capacity for Resources with a telemetered Resource Status of EMR
hslTOut	Aggregate telemetered HSL capacity for Resources with a telemetered Resource Status of OUT
hslTOutl	Aggregate net telemetered consumption for Resources with a telemetered Resource Status of OUTL