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Distribution System Simulator

The distribution system simulator evaluates local grid assets under coherent net demand and behind-the-fence supply scenarios.

Probabilistic planning

Moving Beyond One Deterministic Peak-Based Scenario

The simulator uses 8760-hour load and behind-the-fence supply scenarios to show when asset stress emerges, which assumptions drive it, and how likely it is across plausible future conditions.

Scenario ensemble · asset loading8,760 hours · illustrative
Scenario pathsLikely rangeAsset capacity
100%755025JANAPRJULOCTDEC CAPACITYTAIL-RISK STRESS
Probability
How likely?
Timing
When does it emerge?
Driver
What causes it?
Scenario-weighted network healthIllustrative system view
HealthyMarginalAt risk
SERVICE TERRITORYMARGINAL SUBSTATION AHEALTHY SUBSTATION BMARGINAL FEEDER 01HEALTHY FEEDER 04MARGINAL FEEDER 07AT RISK FEEDER 09HEALTHY TX-102TX-168TX-214TX-307 SYSTEMSUBSTATIONSFEEDERSTRANSFORMERS
1Feeder 07 + TX-214Priority need

ASSET AND SYSTEM WELL-BEING

Assessment Studies at Feeders, Transformers, Substations, and System Levels

Each asset is assigned a well-being state (healthy, marginal, or at risk) across the full scenario family rather than at a single worst-case hour. Deficiencies are then ranked by the likelihood and severity of overload and contingency exposure, producing a risk-ordered queue of reinforcement needs and the years they arrive.

DER and reverse flow

DER Impact Analysis

Behind-the-fence PV, conventional generation, and other DERs reshape net load and can push power backward through the feeder. The simulator quantifies what that does to voltage, thermal loading, and remaining hosting capacity, under the same weather draw that produced the demand and supply scenarios.

Feeder net power flowHigh-DER day · illustrative
Net feeder flowReverse-flow periodZero flow
IMPORTZEROEXPORT00h06h12h18h24h BEHIND-THE-FENCE SUPPLY EXCEEDS LOCAL DEMANDREVERSE POWER FLOWFLOW REVERSAL
Voltage
Rise and excursion
Thermal
Directional loading
Hosting
Remaining capacity
Risk-ordered reinforcement planAcross scenario family · illustrative
Robust needTiming variesScenario-dependent
YEAR 13579 1FEEDER 07RECONDUCTOR2SUBSTATION BBANK ADDITION3TX-214REPLACEMENT4FEEDER 04VOLTAGE SUPPORT EARLIESTLATESTCONDITIONAL
Priority
Risk-ranked
Window
Earliest to latest
Decision
Robust or conditional

Investment timing

Prioritizing and Timing Reinforcements

Reinforcement projects are ranked by the severity and likelihood of the deficiencies they resolve, and each carries the year it becomes necessary. Comparing across load growth, DER, electrification, and large-load assumptions shows which projects hold their rank and their date under every scenario, and which move or fall away depending on what materializes.

Building a shared view of the future grid.

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