Real-Time Market

During real-time, ERCOT dispatches resources based on economics and reliability to meet the system demand while observing resource and transmission constraints. Security Constrained Economic Dispatch (SCED) is the real-time market evaluation of offers to produce a least-cost dispatch of online resources. SCED calculates Locational Marginal Prices (LMPs) using a two-step methodology that applies mitigation to resolve non-competitive constraints.

Real-Time Prices Displays
Real-Time LMPs for Latest SCED Run Display View the Locational Marginal Prices per Settlement Point from the real-time market for the latest SCED run which is normally within the last five minutes.
Real-Time LMPs for Load Zones and Trading Hubs Display View the Locational Marginal Prices per Load Zone and Trading Hub from the real-time market for the latest SCED run which is normally within the last five minutes.
Real-Time Settlement Point Prices Display View the Settlement Point Prices for the Load Zones and Trading Hubs from the real-time market for the current day as well as the previous five days.

Real-Time Prices Reports
LMPs by Electrical Bus View the Locational Marginal Price for each Electrical Bus, normally produced by SCED every five minutes.
LMPs by Resource Nodes, Load Zones and Trading Hubs View the Locational Marginal Price for each Settlement Point, normally produced by SCED every five minutes.
Real Time Point-to-Point Option Price Report The value in dollars in the real time market for each Point-to-Point Option, identified by source and sink Settlement Point, produced every hour.
Settlement Point Prices at Resource Nodes, Hubs and Load Zones View the Settlement Point Price for each Settlement Point, produced from SCED LMPs every 15 minutes.
SCED Shadow Prices and Binding Transmission Constraints The report for Shadow Prices of binding/violated constraints in SCED. The report shows the contingency name, overloaded element details (element name, from/to station name and kV level), Shadow Price ( price for resolving one MW of the constraint), Penalty for violating the constraint (MaxShadow Price), overloaded element limit and flow (value)pairs that caused such constraint.

SASM
SASM Aggregated Ancillary Service Offer Curve View the aggregated AS offers for each hour and AS type used by SASM.
SASM MCPC by Ancillary Service Type View the Market Clearing Price for Capacity for each hour and AS type procured in SASM.
Total Ancillary Service Procured in SASM View the total capacity in MW for each hour and AS type procured in SASM.

Real-Time Supporting Information
Approved GREDP and CLREDP Performance Criteria Variables This spreadsheet contains historic and current approved GREDP and CLREDP performance criteria variables.

Scarcity Pricing Mechanism
Peaker Net Margin View the cumulative Peaker Net Margin in dollars per MW since the start of the annual resource adequacy cycle, posted daily.
System-Wide Offer Cap View the System-wide Offer Cap in place for Ancillary Services and Energy for the last thirty days on a daily basis.

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Key documents

Methodology for Setting Maximum Shadow Prices for Network and Power Balance Constraints
View the methodology for setting maximum Shadow Prices for network constraints and for the power balance constraint.
(03/01/12, .zip, 697.7 KB)