2.5.28.4	 Replacement Reserve.  The user rate per unit of Replacement Reserve obligation for each Settlement Period t for each Zone x shall be as follows:

whereOrigReplReqDAxt = Replacement Reserve requirement net of self-provision in the Day-Ahead Market before consideration of any substitutions pursuant to Section 2.5.3.6.
OrigReplReqHAxt = Incremental change in the Replacement Reserve requirement net of self-provision between the Day-Ahead Market and the Hour-Ahead Market before consideration of any substitutions pursuant to Section 2.5.3.6.
PRepResDAxt is the Market Clearing Price for Replacement Reserve in the Day-Ahead Market for Zone x in Settlement Period t.  
PRepResHAxt is the Market Clearing Price for Replacement Reserve in the Hour-Ahead Market for Zone x in Settlement Period t. 
	For each Settlement Period t, each Scheduling Coordinator shall pay to the ISO a sum calculated as follows for each Zone x:
ReplRatext*ReplObligjxt 
where 
ReplOblig jxt = DevReplOblig jxt + RemRepl jxt - SelfProv jxt+ NetInterSCTradesjxt
DevReplOblig jxt is the Scheduling Coordinator’s obligation for deviation Replacement Reserve in Zone x in the Settlement Period t and RemRepl jxt is the Scheduling Coordinator's obligation for remaining Replacement Reserve in Zone x for Settlement Period t.  
SelfProvjxt is Scheduling Coordinator's Replacement Reserve self provision in Zone x for Settlement Period t.
NetInterSCTradesjxt  is the sale of Replacement Reserve less the purchase of Replacement Reserve through Inter-Scheduling Coordinator Trades by Scheduling Coordinator j in Zone x for Settlement Period t.

Deviation Replacement Reserve for Scheduling Coordinator j in Zone x for Settlement Period t is calculated as follows:
If ReplObligTotalxt > TotalDeviationsxt  then:

If ReplObligTotalxt <  TotalDeviationsxt  then:

where

GenDevijxt = The deviation between scheduled and actual Energy generation for Generator i represented by Scheduling Coordinator j in Zone x during Settlement Period t as referenced in Section 11.2.4.1.
LoadDevijxt = The deviation between scheduled and actual Load consumption for resource i represented by Scheduling Coordinator j in Zone x during Settlement Period t as referenced in Section 11.2.4.1.
DevReplOblig xt is total deviation Replacement Reserve in Zone x for Settlement Period t.

ReplObligTotalxt is total Replacement Reserve Obligation (including self-provision) in Zone x for Settlement Period t.
Remaining Replacement Reserve for Scheduling Coordinator j in Zone x for Settlement Period t is calculated as follows:

where:
MeteredDemandjxt is the Scheduling Coordinator’s total metered Demand excluding exports in Zone x for Settlement Period t.
TotalMeteredDemandxt is total metered Demand excluding exports in Zone x for Settlement Period t.
TotalRemReplxt = Max[0,ReplObligTotalxt - DevReplObligxt]

SABP 
C 2.2.3	Replacement Reserve.  The user rate per unit of Replacement Reserve obligation for each Settlement Period t for each Zone x shall be as follows: 

where:
OrigReplReqDAxt = Replacement Reserve requirement net of self-provision in the Day-Ahead Market before consideration of any substitutions pursuant to Section 2.5.3.6.
OrigReplReqHAxt = Incremental change in the Replacement Reserve requirement net of self-provision between the Day-Ahead Market and the Hour-Ahead Market before consideration of any substitutions pursuant to Section 2.5.3.6.
PrepResDAxt is the Market Clearing Price for Replacement Reserve in the Day-Ahead for Zone x in Settlement Period t.  
PrepResHAxt is the Market Clearing Price for Replacement Reserve in the Hour-Ahead for Zone x in Settlement Period t. 

For each Settlement Period t, each Scheduling Coordinator shall pay to the ISO a sum calculated as follows for each Zone x:
ReplRatext * ReplObligjxt
where 
ReplObligjxt = DevReplObligjxt + RemRepljxt - SelfProvjxt+ NetInterSCTradesjxt
DevReplObligjxt is the Scheduling Coordinator’s obligation for deviation Replacement Reserve in Zone x in the Settlement Period t and RemRepljxt is the Scheduling Coordinator’s obligation for remaining Replacement Reserve in Zone x for Settlement Period t.  
SelfProvjxt is Scheduling Coordinator's Replacement Reserve self provision in Zone x for Settlement Period t.
NetInterSCTradesjxt  is the sale of Replacement Reserve less the purchase of Replacement Reserve through Inter-Scheduling Coordinator Trades by Scheduling Coordinator j in Zone x for Settlement Period t.
Deviation Replacement Reserve for Scheduling Coordinator j in Zone x for Settlement Period t is calculated as follows:

If ReplObligTotalxt >  TotalDeviationsxt then:

If ReplObligTotalxt <  TotalDeviationsxt then:

where

GenDevijxt = The deviation between scheduled and actual Energy generation for Generator i represented by Scheduling Coordinator j in Zone x during Settlement Period t as referenced in Section 11.2.4.1.
LoadDevijxt = The deviation between scheduled and actual Load consumption for resource i represented by Scheduling Coordinator j in Zone x during Settlement Period t as referenced in Section 11.2.4.1.
DevReplObligxt is total deviation Replacement Reserve in Zone x for Settlement Period t.
ReplObligTotalxt is total Replacement Reserve Obligation (including self-provision) in Zone x for Settlement Period t.

Remaining Replacement Reserve for Scheduling Coordinator j in Zone x for Settlement Period t is calculated as follows:

where:
MeteredDemandjxt is the Scheduling Coordinator’s total metered Demand excluding exports in Zone x for Settlement Period t.
TotalMeteredDemandxt is total metered Demand excluding exports in Zone x for Settlement Period t.
TotalRemReplxt = Max[0,ReplObligTotalxt - DevReplObligxt]