Each Transmission Operator shall verify through analysis of actual events, steady state and dynamic simulations, or testing that its restoration plan accomplishes its intended function. This shall be completed every _____ at a minimum.

Each Transmission Operator shall verify through analysis of actual events, steady state and dynamic simulations, or testing that its restoration plan accomplishes its intended function. This shall be completed every _____ at a minimum.

• A. 1 year
• B. 3 years
• C. 7 years
• D. 5 years

Answer: (D)

The essential idea is that a Transmission Operator must continually verify that its restoration plan still works as intended, using real-event analyses, steady-state and dynamic simulations, or direct testing. This validation has a minimum cadence of every five years. Why five years fits well: it provides a regular, meaningful interval to incorporate changes the grid undergoes—new equipment, topology shifts, different generation mixes, and updated protection schemes—without imposing an excessive burden. The simulations and tests ensure the plan can actually restore service under a range of conditions, including stressed scenarios, and confirm that the sequence of actions, resources, switching, and re-energization steps will achieve restoration within acceptable timeframes. In practice, more frequent validation is wise after major grid changes or after actual restoration drills or events, so lessons learned and new configurations are reflected in the plan. This approach keeps the restoration process credible and actionable as the system evolves.

The essential idea is that a Transmission Operator must continually verify that its restoration plan still works as intended, using real-event analyses, steady-state and dynamic simulations, or direct testing. This validation has a minimum cadence of every five years.

Why five years fits well: it provides a regular, meaningful interval to incorporate changes the grid undergoes—new equipment, topology shifts, different generation mixes, and updated protection schemes—without imposing an excessive burden. The simulations and tests ensure the plan can actually restore service under a range of conditions, including stressed scenarios, and confirm that the sequence of actions, resources, switching, and re-energization steps will achieve restoration within acceptable timeframes.

In practice, more frequent validation is wise after major grid changes or after actual restoration drills or events, so lessons learned and new configurations are reflected in the plan. This approach keeps the restoration process credible and actionable as the system evolves.