The new 500 kV substation on our high-voltage substation and transmission upgrade has been energized, on the date the utility planned. The work was delivered under an EPC contract to relieve a congested grid, where new generation could not connect until the substation and the line upgrades were in service.
A schedule set by outage windows
Work on the existing lines needed outages, and the grid operator would approve them only in spring and fall. Missing a window meant waiting months for the next one. So each window went into the schedule as a hard milestone, not a target, and everything that had to be ready for it was linked back from that date.
- Readiness at 90, 30 and 7 days. Before every window, the team checked material, crews, switching plans and testing against a written list, three times. Anything not ready at 90 days had a recovery plan. Anything not ready at 7 days was escalated to the owner the same day.
- Six windows used, none missed. Every outage the project needed was taken in the window it was planned for.
Transformers on the critical path
Large power transformers and breakers had lead times of well over a year, longer than most of the field work. We tracked their manufacturing with factory test dates, not just ship dates, so a slip at the factory showed up as lost float months before delivery, while there was still time to resequence. Our own crews finished foundations and grounding early, so structures and equipment could be set as soon as they arrived.
An outage window does not wait for anyone. We checked readiness at ninety days, thirty and seven, and walked in ready each time.
Project manager, Jacob Wiseman
Testing with the utility
Relay and control testing was done jointly with the utility, with switching plans reviewed line by line before each energization step. That shared testing is what let the final window close on time, and it is why the new yard went into service without a second attempt.
