Automated Base-Point Following to Avoid ERCOT Performance Failures
Key Takeaway
ERCOT dispatches resources to base points, and a resource is scored on how closely its telemetered output follows them. Automated base-point following controls — receiving the instruction, adjusting output accurately, and telemetering the response — minimize deviation and protect a QSE from performance shortfalls. Manual response is too slow and inconsistent for tight-tolerance products.
Quick Answer
ERCOT dispatches resources to base points, and a resource is measured on how closely its telemetered output follows those instructions. Automated base-point following controls — reliably receiving the instruction, adjusting output accurately and quickly, and telemetering the response — minimize deviation and protect a QSE from performance shortfalls and any associated charges. For tight-tolerance products, manual response is too slow and inconsistent.
What Base-Point Following Means
A base point is the output ERCOT instructs a resource to produce (or a load to consume) at a given time. The resource is expected to move to that setpoint and hold it, and its telemetered output is compared against the instruction. Sustained divergence — base-point deviation — can carry settlement and performance consequences and, in the aggregate, signals an unreliable resource. As covered in why telemetry problems cost QSEs money, deviation is both a real control problem and, sometimes, a telemetry-quality artifact.
The Control Loop
- Receive the instruction reliably from the QSE/ERCOT interface.
- Translate it to a setpoint the resource's controls can execute, respecting sustainable limits and ramp rates.
- Adjust output accurately — governor/AGC control for generation, inverter/EMS control for storage, or curtailment control for loads.
- Telemeter the response so ERCOT sees the resource followed the instruction.
Each step must be automated and tuned. A slow or sloppy loop produces deviation even when the resource is physically capable.
Why Manual Response Falls Short
For products with tight tolerances and fast cadence — Regulation especially, per ancillary service telemetry requirements — a human cannot track instructions accurately enough or fast enough. Automated control is not a convenience; it is a requirement for competitive performance. Under RTC+B's faster co-optimization, the premium on responsive, well-tuned controls increases further.
Resource-Specific Considerations
- Generation — governor response, AGC integration, and ramp- rate handling determine tracking quality.
- Storage — fast and precise, but the EMS must manage state-of-charge so the resource can honor commitments; see BESS monitoring for ERCOT.
- Controllable loads — sequenced, safe curtailment that reaches the instructed reduction without tripping critical processes, per automated load curtailment and controllable load resources.
Verify with Telemetry
Following the base point is only half the job — ERCOT must see it. The control and telemetry designs are two halves of the same system, which is why performance and telemetry should be engineered together. NFM Consulting builds and tunes base-point following controls and the telemetry that verifies them. Contact NFM Consulting to reduce a resource's deviation and performance risk.
Frequently Asked Questions
A base point is the output ERCOT instructs a resource to produce or consume at a given time. Base-point following is the resource moving to that setpoint and holding it, with its telemetered output compared against the instruction. Sustained divergence, called base-point deviation, can carry settlement and performance consequences.
For products with tight tolerances and fast cadence — Regulation in particular — instructions change too quickly and precisely for a human to track accurately. Automated controls that receive the instruction, adjust output within limits and ramp rates, and telemeter the response are required for competitive performance, and RTC+B's faster cycle increases that need.
Controls make the resource follow the base point; telemetry proves to ERCOT that it did. Both are needed: a resource that follows dispatch but doesn't telemeter its response accurately may not be credited, and one with good telemetry but poor controls will show real deviation. They should be engineered and validated together.