Total Ancillary Service Offers

Retired — no longer supported

Total Ancillary Service Offers were removed with the RTC+B implementation on 12/05/2025. ERCOT no longer returns this report, and the TotalASOffers payload is no longer defined in the ERCOT Web Services XSDs.

This page is retained for reference when interpreting data retrieved before that date. The field tables and XML examples below describe the pre-RTC+B schema and will not validate against the current XSDs.

This section describes interfaces used to retrieve total ancillary services offers for DAM Market. This interface will return the full day data for DAM market for the requesting day.

The request message would use the following message fields:

Message Element	Value
Header/Verb	get
Header/Noun	TotalASOffers
Header/Source	Market participant ID
Header/UserID	ID of user
Request/OperatingDate	Day of interest

The corresponding response messages would use the following message fields:

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

The payload structure is described by the following diagrams:

The values of ‘value1’ identify the total MW offers for the given AS type. There is no consideration given to linked offers.

The following is an XML example:

<ns1:TotalASOffers xmlns:ns0="http://www.ercot.com/schema/2007-05/nodal/eip/il"
    xmlns:ns1="http://www.ercot.com/schema/2007-06/nodal/ews">
    <ns1:TotalASOffer>
        <ns1:asType>Reg-Up</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>7262.6</ns1:value1>
        </ns1:Schedule>
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>Reg-Down</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>6744.6</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>Non-Spin</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>38163.2</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>RRSUF</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>31086.0</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>RRSFF</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>31086.0</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>RRSPF</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>32038.8</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>ECRSS</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>49578.7</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
    <ns1:TotalASOffer>
        <ns1:asType>ECRSM</ns1:asType>
        <ns1:Schedule>
            <ns1:time>2023-03-08T00:00:00-06:00</ns1:time>
            <ns1:ending>2023-03-08T01:00:00-06:00</ns1:ending>
            <ns1:value1>2967.0</ns1:value1>
        </ns1:Schedule> 
        ... 
    </ns1:TotalASOffer>
</ns1:TotalASOffers>