Which city has one of the largest step-up transformers in OC?

• A. Irvine
• B. Santa Ana
• C. Anaheim
• D. Orange

Answer: (B)

Step-up transformers are large equipment at transmission substations that raise voltage for sending power over long distances; their size (capacity) reflects how much electricity they can move into the high‑voltage grid. In Orange County, the biggest step-up transformers are found at major transmission hubs that connect a large portion of the county to the regional grid. Santa Ana is a major load center with a large transmission substation, so it hosts one of the largest step-up transformers in OC.

Other cities in the list have important electrical infrastructure, but their substations mainly serve local distribution and smaller transfer needs rather than the bulk interconnection required for the county’s largest step-up units.