What SCADA data does ERCOT require from generation resources?

ERCOT requires real-time telemetry of MW output, MVAR (reactive power), bus voltage, system frequency, and breaker status. Additional data points may be required depending on resource type — wind farms need turbine status and meteorological data, solar facilities need inverter status and irradiance, and battery storage needs state of charge and available capacity.

What protocol does ERCOT use for SCADA telemetry?

ERCOT primarily uses ICCP (IEC 60870-6/TASE.2) for data exchange with generation resources, typically routed through the QSE's infrastructure. DNP3 (IEEE 1815) is commonly used for communication from the generation site's local SCADA system to the QSE's data aggregation point.

What happens if my SCADA telemetry to ERCOT goes down?

ERCOT monitors telemetry availability continuously. Extended outages trigger notifications and may require outage tickets explaining the cause. Resources with unreliable telemetry face potential financial penalties, operating restrictions, exclusion from ancillary services markets, and compliance investigations.

SCADA Telemetry Requirements for ERCOT Generation Resources: What Owners Need to Know

Quick Answer

ERCOT requires generation resources to provide real-time SCADA telemetry including MW output, MVAR, voltage, breaker status, and frequency via ICCP or DNP3 connections. Data availability must meet minimum thresholds, and non-compliance can result in financial penalties, operating restrictions, and loss of market participation.

ERCOT Nodal Operating Guide Telemetry Mandates

The ERCOT Nodal Operating Guides and Protocols establish telemetry requirements for all generation resources interconnected to the ERCOT grid. These requirements exist because ERCOT's grid operators need real-time visibility into generation output to maintain system reliability, manage congestion, and balance supply and demand across the Texas Interconnection.

Telemetry requirements apply to all generation resources above the minimum threshold defined in ERCOT protocols, including thermal plants, wind farms, solar facilities, and battery energy storage systems. The specific data points, protocols, and availability thresholds are defined in ERCOT's technical requirements documentation and the Nodal Operating Guide.

Required Data Points

ERCOT requires generation resources to telemeter the following data points in real time:

Electrical Measurements

MW (Real Power): Net generation output in megawatts, typically measured at the point of interconnection or generator terminals with a telemetry scan rate of 2-4 seconds.
MVAR (Reactive Power): Reactive power output in megavolt-amperes reactive. Critical for voltage regulation and grid stability monitoring.
Voltage: Bus voltage at the point of interconnection. Used for voltage regulation compliance and grid stability assessment.
Frequency: System frequency measurement for frequency response monitoring and Under Frequency Load Shed (UFLS) coordination.

Status Indications

Breaker status: Open/closed status of generator breakers and main interconnection breakers. Critical for ERCOT to know whether a unit is synchronized to the grid.
Unit status: Operating mode indicators (available, unavailable, on outage) as defined in ERCOT resource status reporting.

Additional Points

Depending on the resource type, additional telemetry may be required:

Wind farm: individual turbine status, meteorological data, curtailment status
Solar: inverter status, irradiance, curtailment status
Battery storage: state of charge, charge/discharge mode, available capacity

Communication Protocols

ICCP (Inter-Control Center Communications Protocol)

ICCP (IEC 60870-6/TASE.2) is ERCOT's primary protocol for real-time data exchange with generation resources. Most established generation owners connect to ERCOT's EMS (Energy Management System) via ICCP bilateral tables that define exactly which data points are exchanged and in which direction. ICCP connections typically flow through the QSE's (Qualified Scheduling Entity's) infrastructure rather than directly from the generation facility.

DNP3

DNP3 (IEEE 1815) is used for telemetry from the generation site's SCADA system to the QSE's data aggregation point. For facilities using Geo SCADA as their plant SCADA system, DNP3 outstation configuration maps local measurements and status points to the DNP3 data objects that the QSE polls. Proper DNP3 configuration requires correct object mapping, event class assignment, and data quality flag handling — errors in any of these cause telemetry quality issues that ERCOT will flag.

Data Quality and Availability Thresholds

ERCOT monitors telemetry data quality and availability continuously. Key thresholds include:

Telemetry availability: Data must be available to ERCOT with minimal interruption. Extended telemetry outages trigger ERCOT notifications and may require the resource owner to submit outage tickets explaining the cause and expected restoration time.
Data quality flags: Telemetry points must include appropriate quality flags (good, suspect, bad) per DNP3 or ICCP standards. Consistently bad quality data is treated similarly to missing data.
Scan rate compliance: Data must be updated at the scan rate specified in the bilateral agreement — typically every 2-4 seconds for critical analog values.
Timestamp accuracy: Telemetry timestamps must be accurate and synchronized. Time synchronization errors cause data quality issues in ERCOT's state estimator and can trigger investigations.

Consequences of Non-Compliance

ERCOT enforces telemetry requirements through several mechanisms:

Financial penalties: Persistent telemetry failures can result in financial penalties under ERCOT protocols, including adjustments to settlement calculations.
Operating restrictions: Resources with unreliable telemetry may face operating restrictions — ERCOT operators cannot dispatch what they cannot see. If your telemetry goes down during high-load conditions, your resource may be curtailed or excluded from dispatch.
Compliance investigations: ERCOT's compliance team investigates persistent telemetry issues. Repeated violations escalate to the ERCOT Board and potentially to PUCT (Public Utility Commission of Texas) enforcement.
Market participation impact: Telemetry failures affect your resource's ability to participate in ancillary services markets (frequency regulation, responsive reserve) that require high-quality real-time data.

How Managed SCADA Ensures Continuous Compliance

Managed Geo SCADA services with ERCOT expertise ensure that your generation resource's telemetry remains continuously compliant. This includes:

24/7 monitoring of SCADA-to-QSE communication links with immediate response to connection failures
DNP3 configuration management to maintain correct data object mapping and quality flag handling
Time synchronization monitoring and correction
Proactive maintenance of the SCADA platform to prevent telemetry outages caused by server failures, database issues, or communication problems
Documentation and reporting for ERCOT compliance inquiries

If you own or operate generation resources in ERCOT and need to ensure your SCADA telemetry meets all requirements, contact NFM Consulting for an ERCOT telemetry compliance review of your current infrastructure.