EMT Studies

Electromagnetic Transient (EMT) time domain analysis is a power system study that models fast transient events - switching operations, faults, and inverter control interactions - that occur in milli to microseconds and can't be captured by traditional RMS or PSPD (Positive Sequence Phasor Domain) models. EMT studies from E Source helps utilities and developers understand how systems behave during these events, revealing risks that conventional planning studies can miss. Many ISOs now require EMT analysis for inverter-based generation and large-load interconnections.

Model fast electrical transients with PSCAD and/or EMTP-RV

Modern power systems are evolving quickly. High-speed switching, inverter-based resources, and advanced control systems create electrical transients and dynamics that occur in milli or microseconds - dynamics that traditional RMS models often cannot capture. By modeling these fast electrical interactions in detail, EMT studies reveal risks that conventional planning studies may miss, giving utilities and developers a clearer picture of how their systems will actually behave.

Identify interconnection risks before they cause ISO delays

Often the most challenging power system problems occur during fast transient events. Switching operations, fault interruption, frequency fluctuation and energization caused transients can trigger interactions between equipment, protection and control systems, that traditional studies cannot fully represent.

For generation and large-load developers, EMT studies can reveal inverter interactions, protection and control and dynamic instability, or functional issues that could otherwise delay project energization.

EMT analysis helps utilities:

Validate system design before construction
Confirm system performance during fast electrical disturbances
Identify damaging transient overvoltages or abnormal currents
Evaluate control interactions between inverter-based resources (IBR) and the grid
Equipment level studies to verify functional/operational capability like Breaker fault current interruption (TRV, RRRV), insulation coordination, Temporary Over Volatge (TOV), capacitor bank and/or transformer energization transient inrush current
For sites under operation: System and equipment failure root cause analysis (RCA) by detailed EMT modeling and studies.

Partner with experienced EMT and power system engineers

Delivering meaningful EMT modeling and analysis requires more than advanced software - it requires engineers who understand how real power systems behave during system energization, VAR/watt exchange with the utility, switching transients, faults, and black start.

E Source supports ISOs, transmission owners, utilities, and developers with EMT modeling and studies for transmission systems, substations, and generation and large-load interconnections across North America, using industry-leading platforms such as PSCAD and EMTP-RV.

Case Study

When a 70 MW solar project was stalled by grid disturbances, every day offline meant $10k+ in lost revenue. Standard studies missed the cause. EMT analysis uncovered the source of the rapid voltage change (RVC) events and provided a clear path to resolution, helping the project move toward interconnection.

Engineering judgement

Actionable results

On-time approvals

Secure grid-ready project sites and optimize planning.

Connect with our team to see how Interconnection Studies for Developers can help you evaluate site feasibility, perform technical modeling, and navigate ISO milestones efficiently from planning through operation.