External Transactions and External Interfaces

If your company is considering moving power from Control Area to Control Area you will need to complete the registration process.

      a. Register for OASIS
      b. Register your scheduling desk and the Source and Sink information below on the TSIN homepage
        1. Source - ISNESYSPOWER
        2. Sink - ISNESYSLOAD
      c. Submit the External Transmission Customer Contact Form; the validation process for the ETCC form will require that your company name must be identical for three registrations shown below: d. Request access to EES through CAMS

Note: Before making a transmission reservation, the transmission customer must establish a valid service agreement with ISO-NE. Details regarding how to obtain transmission service from ISO-NE can be found in the ISO-NE OATT Business Practices.

Participants are charged for Transaction Units and Volumetric Units in Schedule 2 of the ISO Tariff. Transaction units are accrued for each hour that a contract is in place. Volumetric charges are accrued to the extent that a contract results in Real Time Load Obligation (RTLO) or Real Time Generation Obligation (RTGO). The rates and definitions are in Schedule 2 of ISO Tariff, which is Section IV of the Transmission Markets and Service tariff. A summary of TU and VM data is included in the MIS report TR_SCH2DT.

ISO Tariff Schedule 2 includes:

(TUs) Transactional Units
  • Scheduled Hours - Count of bid blocks where the unit was not flagged as unavailable
  • Depending on the type of transaction it could generate one of the following:
  • External Transactions - Count of hours of bought & sold
  • Internal Transactions - Count of hours bought & sold
(VMs) Volumetric Units
  • Hourly RT Generation Obligation in MWhs

ISO Tariff Schedule 3 includes:

  • Participant Hourly Scheduled Exports

This Enhanced Energy Scheduling (EES) is the software application used to submit external transactions into the ISO New England market system. The EES User Guide [PDF] will server as the reference document for the specific purpose of transacting business associated with external transactions within the ISO New England (ISO) market place. This document introduces the functionality and the structure of the application and is one of two distinct documents. Both an EES Reference document and Task document are provided. This Reference document explains the general concepts for using the application.

DISCLAIMER: The following answer is presented for information only, and provides descriptions of information contained in NEPOOL Manual 11 and NEPOOL OP-9, but in no way supersedes those documents. This document also contains references to the NYISO processes. These statements regarding the NYISO market are made from the perspective of ISO-NE and in no way represent NYISO market rules. The NYISO market rules should be referred to for any details on the NYISO market.

The following information describes features of the ISO-NE Day-Ahead Markets (DAM) and Real-Time Markets (RTM) as they apply to External Transactions scheduling and the interaction with the NYISO Day Ahead and Real-Time markets. Market participants have many options on how they may submit transactions in to the various markets. The following interaction of the DAM and RTM between the two Control Areas should be considered when planning that submittal.

DAM and RTM interactions

Day-Ahead Market

The Day-Ahead Markets(DAM) in NYISO and ISO-NE clear entirely independent of each other. Transactions submitted to the NYISO DAM are cleared relative to only the NYISO market. Transactions submitted to the ISO-NE DAM are cleared relative to only the ISO-NE market. There is no comparison of results of any transactions between the ISO-NE DAM and the NYISO DAM. In the ISO-NE market the results of the DAM are financial, creating balancing obligations for the RTM, but do not, in and of themselves, result in transaction scheduling in Real-Time. In the NYISO DAM, due to reliability concerns and software constraints, all cleared DAM transactions are processed as offers of physical energy in real-time. NYISO Virtual Transaction scheduling, within the provisions of the NYISO Services Tariff, are not available at External Nodes.

Transition between Day Ahead Market and Real Time Market

In NYISO, the transactions that cleared the DAM automatically carry forward into the Hour-Ahead Market (HAM) as physical energy transactions for the reasons described above. In the ISO-NE market, transactions that cleared the DAM do not carry forward into the RTM. If a participant wants a RTM transaction to match a DAM obligation, the participant must specifically submit the transaction into the ISO-NE RTM.

Flowing Energy in Real-Time

In order for flow to occur in the Real-Time Market, a transaction must pass one or two checkout processes depending on its submittal time. The first checkout process is the day-before checkout. The term day-before checkout is used rather than day-ahead checkout to clearly separate this process from the clearing or any other aspect of the Day-Ahead Market. In the day-before checkout, the results of the NYISO DAM are compared to only those ISO-NE RTM transactions that were submitted prior to 10:00 the day before the operating day. Transactions that pass this checkout are used in the ISO-NE reliability assessments. The NERC Tag is used as the common identifier and the MW profiles for the transactions in the two markets are compared. This information must match to 'pass' the checkout.

After ISO-NE issues an M/LCC 2 Abnormal Conditions Alert, any export transactions that were submitted only to the RTM are subject to reduction before other export transactions that cleared the DAM. If Operating Procedure 4, Action during a Capacity Deficiency (OP 4) is declared, transactions that cleared the DAM will be reduced as defined within the ISO-NE Manual for Market Operations, M-11, and OP 4 to mitigate the emergency condition.

Prior to reducing any export transactions that have cleared the DAM, ISO-NE will attempt to schedule all priced import transactions. To the extent that priced import transactions supporting an ICAP Import Contract are not available to be scheduled, they may be assigned a "Failure to Deliver" penalty.

The Competitive Offer levels are published to the ISO Web site no later than 8:50 a.m. the day before the operating day. If the ISO experiences technical difficulties that prevent the next operating day's Competitive Offer levels to be published by 8:50, the Competitive Offer levels for the previous operating day will remain in effect.

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