Glossary - P

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
PCAP Pre-Contingency Action Plan
PCRR Pre-Assigned Congestion Revenue Right
PGC Power Generation Company
PNM Peaker Net Margin
POC Peaking Operating Cost
POI Point of Interconnection
POLR Provider of Last Resort
POS Power Operating System
PRC Physical Responsive Capability
PRM Planning Reserve Margin
PRR Protocol Revision Request
PRS Protocol Revision Subcommittee
PSS Power System Stabilizer
PTP Point-to-Point
PUCT Public Utility Commission of Texas
PURA Public Utility Regulatory Act, Title II, Texas Utility Code
PURPA Public Utility Regulatory Policy Act
PV PhotoVoltaic
PVGR PhotoVoltaic Generation Resource
PVGRPP PhotoVoltaic Generation Resource Production Potential
PWG Profiling Working Group
Partial Blackout

See Blackout

Participating Congestion Revenue Right (CRR) see Congestion Revenue Right (CRR) Account Holder
Peak Load Season Summer months are June, July, August, and September; winter months are December, January, and February.
PhotoVoltaic (PV) Of or pertaining to a material or device in which electricity is generated as a result of exposure to light.

PhotoVoltaic Generation Resource (PVGR)

A Generation Resource that is powered by PhotoVoltaic (PV) equipment exposed to light.  PV equipment may be aggregated together to form a PVGR as set forth in paragraph (11) of Section, Modeling of Resources and Transmission Loads.

PhotoVoltaic Generation Resource Production Potential (PVGRPP)

The generation in MWh per hour from a PVGR that could be generated from all available units of that Resource allocated from the 80% probability of exceedance of the Total ERCOT PhotoVoltaic Power Forecast (TEPPF).

Physical Responsive Capability (PRC)

A representation of the total amount of frequency responsive Resource capability On-Line in Real-Time.

Planned Outage See Outage
Planning Reserve Margin (PRM) The net of total capacity for the Peak Load Season, less firm peak Load for the Peak Load Season, divided by the firm peak Load for the Peak Load Season (expressed as a percentage).
Point of Interconnection (POI) The voltage level and substation where a Generation Entity’s interconnection Facilities connect to the Transmission Facilities as reflected in the Standard Generation Interconnection Agreement (SGIA) between a Generation Entity and a Transmission Service Provider (TSP) or the voltage level and substation where Load interconnects to the TSP Facilities.
Point-to-Point (PTP) Point-to-Point (PTP) Obligation with Links to an Option (see Congestion Revenue Right (CRR))
Point-to-Point (PTP) Obligation See Congestion Revenue Right (CRR)
Point-to-Point (PTP) Obligation with Links to an Option A type of CRR that entitles a Non-Opt-In Entity's (NOIE's) PTP Obligation bought in the DAM to be reflective of the NOIE's PTP Option. To qualify as a PTP Obligation of this type, the source and sink pairs on both the NOIE's PTP Obligation and the NOIE's PTP Option shall be the same, and the MWs of the NOIE's PTP Obligations shall be less than or equal to the number of MWs of the NOIE's PTP Option. Qualified PTP Obligations with Links to an Option shall be settled as if they were a PTP Option.
Point-to-Point (PTP) Option A type of CRR that is evaluated in each CRR Auction and DAM as the positive power flows on all directional network elements created by the injection and withdrawal at the specified source and sink points in the quantity represented by the CRR bid or offer (MW), excluding all negative flows on all directional network elements. A PTP Option entitles the holder to receive compensation equal to the positive energy price difference between the sink and the source Settlement Point Prices. A PTP Option with Refund is evaluated in the same manner and compensated as described in Section 7.4.2, PCRR Allocations and Nominations.

Point-to-Point (PTP) Option Award Charge

A charge placed on each PTP Option bid awarded where the clearing price for the PTP Option bid awarded is less than the Minimum PTP Option Bid Price as further described in Section 7.7.1, Determination of the PTP Option Award Charge.

Power System Stabilizer (PSS) A device that is installed on Generation Resources to maintain synchronous operation of the ERCOT System under transient conditions.

Pre-Assigned Congestion Revenue Right (PCRR) Nomination Year

The calendar year that is three years after the year containing a PCRR nomination process.

Pre-Contingency Action Plan (PCAP)

A set of pre-defined manual actions to execute pre-contingency to address voltage issues or reduce overloading on one or more given, monitored Transmission Facilities to below their Emergency Rating with restoration of normal operating conditions within two hours. A PCAP may include transmission switching and does not include Load shedding. A PCAP may also be implemented for the duration of an Outage and shall be included in the Outage Scheduler as soon as practicable.

Premise A Service Delivery Point or combination of Service Delivery Points that is assigned a single ESI ID for Settlement and registration.
Presidio Exception The losses associated with keeping the 69 kV line from the Gonzales substation to the ERCOT BLT Point at Presidio constantly energized in order to maintain connectivity and allow for rapid response to contingencies impacting the reliability for Customers in the Presidio area when there is no BLT of Load from the ERCOT Control Area to a non-ERCOT Control Area. The TDSP responsible for the Presidio BLT Point metering shall witness and maintain records of meter verification no less than every four years.

Primary Frequency Response

The immediate proportional increase or decrease in real power output provided by All-Inclusive Generation Resources and Controllable Load Resources and the natural real power dampening response provided by Load in response to system frequency deviations. This response is in the direction that stabilizes frequency.

Prior Agreement

Any previous Agreement between an Entity, its Affiliate, or its predecessor in interest and ERCOT about performance under the ERCOT Protocols.

Private Use Network

An electric network connected to the ERCOT Transmission Grid that contains Load that is not directly metered by ERCOT (i.e., Load that is typically netted with internal generation).

Program Administrator The Entity approved by the PUCT that is responsible for carrying out the administrative responsibilities for the Renewable Energy Credit Program as set forth in P.U.C. SUBST. R. 25.173.

Protected Information

Information protected from disclosure as described in Section 1, Overview.

Provider of Last Resort (POLR) The designated CR as defined in the P.U.C. SUBST. R. 25.43, Provider of Last Resort (POLR), for default Customer service, and as further described in Section 15.1, Customer Switch of Competitive Retailer.