Riggsville – Port Calcite – Rockport Transmission Line Rebuild
To improve the reliability of electrical service in northern Michigan, ITC is rebuilding approximately 70 miles of transmission line spanning the northeast lower peninsula.
Project Summary
In order to improve the reliability of high-voltage electrical service in northern Michigan, ITC Michigan, through its Michigan Electric Transmission Company (METC) subsidiary, is rebuilding approximately 70 miles of the Riggsville – Port Calcite – Rockport 138,000 volt (138 kV) double circuit transmission line spanning the northeast lower peninsula.
The initial 25-mile section of line, Rockport-Port Calcite, was completed in 2020. The final portion, the 45-mile Riggsville-Port Calcite line, was completed and energized in November 2025, which included the replacement of approximately 475 wood poles with steel monopoles.
This area was impacted by the northern Michigan ice storm in March 2025 — however, the portions of the lines that were re-built withstood the storm. This reinforces the importance of rebuilds to the reliability of the system.
With the recent energization, the Riggsville-Port Calcite-Rockport line is nearly complete, with a small section of line through a quarry being replaced in spring 2026.
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