Glossary - I

For your convenience, this page contains an alphabetically organized list of terms, definitions and common acronyms used in the electric utility industry.


Term/Acronym Definition
ICCP Inter-Control Center Communications Protocol
IDR Interval Data Recorder
IE Interconnecting Entity
IEL Initial Estimated Liability
IMM Independent Market Monitor
IMRE Independent Market Information System Registered Entity
IOU Investor Owned Utilities
IPM Independent Power Marketer


Interconnection Reliability Operating Limit

IRR Intermittent Renewable Resources
Independent Market Information System Registered Entity (IMRE) A Market Participant that has signed the Standard Form Market Participant Agreement (as provided for in Section 22, Attachment A, Standard Form Market Participant Agreement), and has completed applicable registration and approval for the sole purpose of accessing the MIS Secure Area.
Independent Market Monitor (IMM) The Entity selected to monitor the wholesale electric market pursuant to the Public Utility Regulatory Act (PURA), TEX. UTIL. CODE ANN. § 39.1515 (Vernon 1998 & Supp. 2007) and P.U.C SUBST. R. 25.365, Independent Market Monitor.
Independent Organization An independent organization as defined in the Public Utility Regulatory Act (PURA), TEX. UTIL. CODE ANN. § 39.151 (Vernon 1998 & Supp. 2007)

Interconnecting Entity (IE)

Any Entity that has submitted a Generation Interconnection or Change Request Application proposing to interconnect an All-Inclusive Generation Resource with the ERCOT System, upgrade the rated capacity of an existing All-Inclusive Generation Resource by ten MW or greater, re-power an All-Inclusive Generation Resource, or change the Point of Interconnection (POI) of an All-Inclusive Generation Resource, but that has not yet submitted the Resource Registration data for the new All-Inclusive Generation Resource or change thereto pursuant to paragraph (1) of Section 16.5, Registration of a Resource Entity.

Intermittent Renewable Resource (IRR) A Generation Resource that can only produce energy from variable, uncontrollable Resources, such as wind, solar, or run-of-the-river hydroelectricity.

Intermittent Renewable Resource (IRR) Group

A group of two or more IRRs whose performance in responding to Security-Constrained Economic Dispatch (SCED) Dispatch Instructions will be assessed as an aggregate for Generation Resource Energy Deployment Performance (GREDP) and Base Point Deviation.  An IRR Group cannot contain any IRRs that are Split Generation Resources.  Additionally, only IRRs that have the same Resource Node can be mapped to an IRR Group.  Resource Entities can choose to group IRRs and shall provide the grouping information in a timely manner for ERCOT review prior to the scheduled database loads.

Interval Data Recorder (IDR) A metering device that is capable of recording energy in each Settlement Interval under Section 9, Settlement and Billing, and Section 10, Metering.
Interval Data Recorder (IDR) Meter An IDR where the ESI ID is required to be assigned a BUSIDRRQ Load Profile Type code and data is submitted in accordance with Section, Submission of Settlement Quality Meter Data to ERCOT.
Interval Data Recorder (IDR) Meter Data Threshold The percentage of IDR Meter data, by Meter Reading Entity (MRE), that must be available before ERCOT will perform a True-Up Settlement as set forth in Section 9.5.8, RTM True-Up Statement.
Interval Data Recorder (IDR) Meter Mandatory Installation Requirements The kW (kVA) level at which the installation of an IDR Meter is required for Settlement purposes as set forth in Section 18.6.1, Interval Data Recorder Meter Mandatory Installation Requirements.

Interval Data Recorder (IDR) Meter Optional Removal Threshold

The kW (kVA) level at which an IDR may be removed as set forth in Section 18.6.2, Interval Data Recorder Meter Optional Removal.

Invoice A notice for payment or credit due rendered by ERCOT.
Invoice Recipient A Market Participant that receives an Invoice from ERCOT.