Take the desk. The clock stops at each decision.

You start with a briefing: your company, your desk and the system as it stands, on displays that tag every number as cited from a NERC document, set by your company or RC, or computed by the model. The clock then runs between decisions and stops while you decide. Each shift has 7 or 8 decisions, and every decision is a question a working operator would face: which notification, which action, whose clock is running.

gridprep.app/app

gridprep.app/app

A new shift draws new numbers from a seed, so a scenario does not repeat itself. Your credential sets your desk: RC takes the RC desk, BT the BA and TOP desks, TO the TOP desk and BI the BA desk.

Each title below comes with the standards the shift draws on. The scenario text itself opens when you start the shift.

1. Largest unit trips at the evening peakBAL-002-3 · BAL-001-2Desk BA · 8 decisions · ≈110 sim-min
2. ACE beyond BAAL: the 30-minute clockBAL-001-2 · BAL-003-2Desk BA · 7 decisions · ≈71 sim-min
3. Line trip, overload on the parallel pathFAC-011-4 · TOP-001-6 · COM-002-4Desk TOP · 7 decisions · ≈70 sim-min
4. IROL exceedance: the Tv clockIRO-009-2 · IRO-008-3 · TOP-001-6 · COM-002-4Desks RC · TOP · 8 decisions · ≈31 sim-min
5. Short of capacity: EEA 1 to EEA 3EOP-011-4 · BAL-002-3 · IRO-001-4 · EOP-004-4Desk BA · 8 decisions · ≈183 sim-min
6. EMS lost: monitoring goes darkTOP-001-6 · BAL-005-1 · IRO-008-3 · IRO-014-3 · IRO-018-1(i) · COM-002-4 · EOP-008-2 · EOP-004-4Desks TOP · RC · 8 decisions · ≈82 sim-min
7. Interchange requests against the clockINT-006-5 · INT-009-3Desk BA · 8 decisions · ≈63 sim-min
8. Voice paths down Free demoCOM-001-3 · COM-002-4 · EOP-004-4Desks BA · TOP · RC · 7 decisions · ≈95 sim-min
9. Evacuate the control roomEOP-008-2 · TOP-001-6 · IRO-008-3 · BAL-005-1 · COM-002-4 · EOP-004-4Desks TOP · RC · 7 decisions · ≈145 sim-min

A shift ends with a debrief, never a percentage. It counts your decisions as best, acceptable, missed or critical, and counts the requirement obligations you met or missed against the standards' own clocks. The verdict is either at standard or not yet at standard, and the bar is set by Grid Prep, not by NERC. Below the verdict you get a timeline of the shift, every decision with the key and its explanation, and the requirements it exercised, so you can go back to the standard and read it.

The demo shift, Voice paths down, is free on the web. It needs no key and no account, and you can run it as often as you like. Full Access, US$24.99 once, opens all nine scenarios, together with every question, unlimited mock exams at exam pace, Smart Review and the Library. Your finished shifts sync with your progress across your browsers.

The iPhone, iPad and Mac app has the simulator too, with its own free shift and its own in-app purchase. A web license doesn't unlock the app, and the in-app purchase doesn't unlock the web.

Try the free demo

The simulator is a study aid. It is not an approved simulation course, it does not award CEHs, and it does not satisfy the training under PER-005-2 R4. Grid Prep is independent of NERC. Some numbers on the displays are set by your company or RC in real life, so the simulator tags them as such and does not present them as NERC requirements.