ROCKPORT
SubstationMichigan · WOLVERINE PWR SUPPLY COOP, INC
ROCKPORT is an electric transmission substation in Michigan, operated by WOLVERINE PWR SUPPLY COOP, INC. It is classified as sub-transmission (138 kv) and connects 2 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Ownership & operation
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #243 | 138 kV | WOLVERINE PWR SUPPLY COOP, INC | IN SERVICE | 24.0 mi |
| #7384 | 138 kV | WOLVERINE PWR SUPPLY COOP, INC | IN SERVICE | 18.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ROCKPORT, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| UNKNOWN143782 | Substation-Adjacent | MI | Presque Isle County | 138 kV | 100 MW | 2.2 yrs | 69.9 |
| FOUR MILE HYDROPOWER PROJECT | Substation-Adjacent | MI | Presque Isle County | 138 kV | 100 MW | 2.2 yrs | 68.4 |
| ROCKPORT | Substation-Adjacent | MI | Presque Isle County | 138 kV | 100 MW | 2.2 yrs | 67.2 |
| PORT CALCITE | Substation-Adjacent | MI | Presque Isle County | 138 kV | 100 MW | 2.2 yrs | 65.4 |
| TAP140015 | Substation-Adjacent | MI | Montmorency County | 138 kV | 100 MW | 2.2 yrs | 64.6 |
| UNKNOWN133169 | Substation-Adjacent | MI | Montmorency County | 138 kV | 100 MW | 2.2 yrs | 63.1 |
| Greenfield (FOUR MILE HYDROPOWER PROJECT -) | Greenfield | MI | Presque Isle County | 138 kV | 100 MW | 2.2 yrs | 62.6 |
| OZ Presque Isle | Greenfield | MI | Presque Isle | — | — | 2.2 yrs | 62.6 |
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
This page shows a public slice of the GridCensus dataset for ROCKPORT substation, Michigan. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.