Enrollments 
 
 
These FAQs supplement the information contained in the Ameren RES Handbook as well as the Ameren Illinois Supplier Terms and Conditions.

If you have any questions or comments regarding the information below, please contact the Ameren Transmission Services Business Center at 888.263.7361.

    The Ameren billing window is a four business day period of time that extends from two business days prior to an account’s scheduled meter reading date to one business day after an account’s scheduled meter reading date. On-cycle enrollments always occur within an account’s billing window and may occur on a non-business day if the non-business day falls within the billing window.<br><br> To view a table listing Ameren’s scheduled meter reading dates, please see Ameren’s Scheduled <a href="/BusinessPartners/RetailElectricSuppliers/Pages/ScheduledMeterReadDates.aspx">Scheduled Meter Reading Dates</a> page.
     
    A service point consists of metered or unmetered load that is assigned to a specific Ameren rate. A service point containing metered load can have one or more meters associated with it.<br><br> An account may have multiple electric service points. Typically, an account that has multiple electric service points has a different rate assigned to each of those service points. For example, an account with a DS2 service point may also have a DS5 (lighting) service point. However, it is possible for an account to have multiple electric service points that are each on the same rate.
     
    First, note that enrollments are effectuated at the service point level, not the account level (see FAQ number 2 above for a definition of “service point”). Thus, an on-cycle enrollment for an account with multiple electric service points could have a slightly different enrollment effective date for each service point on the account.<br><br> On-cycle enrollment of a scalar metered service point: <br><br> Enrollment is effectuated when the service point’s meter data is collected - which will occur within the four business days that comprise the account’s billing window. The actual time of the enrollment could be anytime during the day that the meter data is collected. Note that an on-cycle enrollment may occur on a non-business day if the non-business day falls within the billing window. <br><br> On-cycle enrollment of an interval metered service point: <br><br> Enrollment is effectuated when the service point’s meter data is collected - which will occur within the four business days that comprise the account’s billing window. The actual time of the enrollment could be anytime during the day that the meter data is collected. Note that an on-cycle enrollment may occur on a non-business day if the non-business day falls within the billing window. <br><br> Off-cycle enrollment of a scalar metered service point: <br><br> Enrollment is effectuated as of the very end of the day (i.e. 23:59:59) of the date requested. An actual meter reading on the off-cycle enrollment date is not taken. Instead, for the first billing period that includes the date of the off-cycle enrollment, usage is prorated for the time between when the enrollment is effectuated and the date on which the meter is actually read. <br><br> Off-cycle enrollment of an interval metered service point: <br><br> Enrollment is effectuated as of the very end of the day (i.e. 23:59:59) of the date requested.
     
    For an on-cycle enrollment, Ameren returns the account’s scheduled meter reading date as the enrollment effective date. However, since Ameren has a four business day billing window (extending from two business days prior to an account’s scheduled meter reading date to one business day after an account’s scheduled meter reading date) the actual enrollment effective date can occur anytime - including a non-business day - within that window.<br><br> Since Ameren doesn’t know - at the time the on-cycle enrollment DASR is submitted - what the specific enrollment effective date is going to be, the scheduled meter reading date is returned as a placeholder for the enrollment effective date. Again, the actual enrollment effective date could vary by up to two business days prior to the account’s scheduled meter reading date to one business day after the account’s scheduled meter reading date.
       
    Some accounts, typically larger commercial or industrial accounts, are calendar-month billed. With calendar-month billing, any non-lighting electric service points on such accounts are billed in calendar-month increments. Note that if a calendar-month billed account has a lighting service point, then the lighting service point may not necessarily bill in calendar-month increments (although the non-lighting service points will).<br><br> There are three types of calendar-month billing: beginning of the month, middle of the month, and end of the month. The vast majority of calendar-month billed accounts are end of the month. This means that the non-lighting service points on such accounts always bill through the last calendar day of each month. There is a small number of beginning of the month calendar-billed accounts. The non-lighting service points on these accounts bill through the first day of each month. Middle of the month calendar-billed accounts are extremely rare. The vast majority of calendar-month billed accounts are assigned to bill group 21, although there are some in bill groups 20 and 01. Note that these three bill groups are not set aside just for calendar-month billed accounts. In other words, most accounts that are assigned to these bill groups are not calendar-month billed.
     
    For a calendar-month billed account, the account’s scheduled meter reading date is not used as the point from which the seven calendar day enrollment/drop blackout period is calculated. Instead, for an end of the month calendar-billed account, an enrollment or drop must be received by Ameren no later than 5:45 p.m. Central Prevailing Time seven calendar days prior to the last calendar day of the month. For a beginning of the month calendar-billed account, an enrollment or drop must be received by Ameren no later than 5:45 p.m. Central Prevailing Time seven calendar days prior to the first calendar day of the month. In cases where the seventh calendar day falls on a weekend day or a holiday, the enrollment or drop must be received by Ameren no later than 5:45 p.m. Central Prevailing Time the first business day prior to that weekend day or holiday.
     
    For various reasons, Ameren may not create the new account number in time for the RES to submit an enrollment DASR that would be effective as of the start date of the account. In addition, sometimes Ameren creates a new account, but there is a delay in getting an electric service point and meter set up on the account. In these situations, it is expected that the RES communicate - via email to their Ameren business representative - their intention to enroll the new account. This communication must happen at least three business days prior to the date that the new account is completely set up.<br><br> Once Ameren creates the new account number, the customer will need to communicate it along with an associated meter number to the RES. The RES will then need to submit an on-cycle enrollment DASR for the new account. Once the enrollment DASR is received by Ameren, Ameren will “repair” the enrollment effective date back to the start date of the new account.<br><br> Note that the onus is always on the customer to keep their RES or their prospective RES aware of any changes to their accounts. This includes the splitting of an account currently served by a RES, the addition of a new account, and any changes to the anticipated start date of a new account.
     
    A RES that wants to enroll an account to Rider PRSS and only serve part of the account’s load should notify their Ameren business representative prior to submitting the enrollment DASR to Ameren. This will allow Ameren time to make the necessary billing system preparations for the enrollment. The customer must also sign a written agreement with Ameren.
     
    Enrollments are effectuated at the service point level. Since service points bill independently of each other, an on-cycle enrollment for an account with multiple electric service points can result in enrollment effective dates that vary slightly by service point. However, for all electric service points on an account, the on-cycle enrollment effective date for each of them will always fall within the four business day Ameren billing window.
     
    If a RES-supplied customer declares bankruptcy, then each Ameren account associated with that customer will be finaled (closed) - thus triggering the generation of one or more EDI 814D transactions to the customer’s RES. If the customer stays in business despite the bankruptcy and wishes to continue with electric service, then a new account or accounts will be set up for the customer. The new account(s) will automatically be assigned to the RES that was supplying the finaled account(s).<br><br> To communicate the enrollment of the new account(s), EDI 814E response transaction(s) will be generated by Ameren and sent to the RES. In the enrollment response transaction(s), BGN06 will be noted with “MANUAL”, the REF*45 segment will show the old account number, and the REF*1P segment will reveal a descriptive code. The REF1P descriptive code will show one of two possible codes: "BNK" (for a customer bankruptcy) or "UIE" (Utility Initiated Enrollment - for any reason other than a bankruptcy).
     
    A PLC is a given service point’s contribution to the Ameren Illinois annual system peak. Currently, Ameren calculates PLCs once per year - typically toward the end of a calendar year. These PLCs then become effective June 1st of the following year. Any new service point that is created after PLC calculations are made gets a PLC assignment of zero until June 1st of the following the year in which a PLC is assigned.
     
Ameren billing window, service point, DASR, Rider PRSS, on-cycle enrollment, Peak Load Contribution, PLC
 
 
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