Advanced PV Software for a Stronger Grid

Machine learning driven HSL, PHL, and RTPP calculation software.

Helping solar plants stay compliant, cut costs, and support grid reliability.

Latimer Flexible Solar Management System™ (FSMS)

Latimer Flexible Solar Management System™ (FSMS) is Latimer Controls’ flagship HSL calculation software for utility-scale photovoltaic plants. Latimer FSMS estimates the available power at every inverter in real-time, and remains accurate even during curtailment, intermittent shading conditions, and low irradiance shoulder periods. Latimer FSMS is a field proven technology that is available for for deployment by utility-scale PV operators across the United States.

For Utility-Scale Developers & IPPs

(1) Ensure Compliant HSL/RTPP Telemetry

HSL/RTPP accuracy is now a compliance requirement in high PV growth regions like ERCOT and Georgia Power. Traditional methods fall short, creating risk.

Inverter-Level Accuracy

✔ Calculate HSL in real time at every inverter

✔ Captures effects of variable cloud shading

regardless of curtailment status

No New Hardware Required

✔ Works with existing SCADA and Plant Controls

✔ Seamless integration provides immediate value

(2) Unlock Actionable Insights

Turn high accuracy HSL telemetry into operational value with clear, accurate analytics.

Precisely Quantify Curtailment

✔ Measure curtailed energy with confidence

✔ Support financial reporting and settlement validation

✔ Inform capital decisions with clear curtailment insights

Back Validate Forecasts

✔ Strengthen confidence in operational and market decisions

✔ Compare forecasted vs. actual generation potential with

high accuracy

For Utilities and Grid Operators

Integrate PV Assets with Frequency Regulation

Enable solar to participate directly in frequency regulation by integrating PV onto AGC. This provides fast, inverter-level response that strengthens grid stability while reducing dependence on conventional generators.

Provide Synchronous Reserves with PV

Leverage solar headroom to provide synchronous reserves traditionally met by thermal assets. Meet evolving market requirements like PJM’s 2026 reserve obligations while improving overall system flexibility and reducing costs.

Drive Down System Operating Cost

Reduce reliance on fossil fuel peaker plants by using PV headroom as a flexible resource. Unlock more value from existing solar fleets and optimize battery investments by reserving storage for when it matters most.

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Real-World Performance: Latimer HSL vs. Legacy Approach

This interactive demo shows real plant behavior during a partially cloudy day at a PV site in Texas. The graph compares Latimer HSL, Legacy HSL, and actual AC Power output. The red shaded regions indicate periods of grid-mandated curtailment.

How to interact with this demo

Toggle Data: Click legend items to isolate specific data streams.
Precision Zoom: Click and drag to inspect specific cloud events. Double-click to reset to the full day view.
Detailed Analytics: Hover over any line to see exact power values and timestamps.

The Latimer Advantage: The dark blue Latimer HSL line tracks the AC Power with near-perfect precision, except for when the site is curtailed. When curtailed, the Latimer HSL shows what the site could be producing.
Curtailment Release Zones: When red curtailment zones end, AC Power immediately returns to the Latimer HSL, proving our model's accurately calculated the available power.
The "Legacy" Gap: The yellow Legacy HSL frequently over- or under-estimates available power and does not handle variable shading well. When curtailment is released, the AC power does not meet the Legacy HSL line.