YEMASSEE
SubstationSouth Carolina · SOUTH CAROLINA ELECTRIC&GAS CO
At a glance
YEMASSEE is an electric transmission substation in South Carolina, on SOUTH CAROLINA ELECTRIC&GAS CO's transmission network. It is classified as high-voltage (230 kv) and connects 10 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #100431 | 230 kV | SCE&G | IN SERVICE | 30.3 mi |
| #138080 | 230 kV | SOUTH CAROLINA ELECTRIC&GAS CO | IN SERVICE | 2.9 mi |
| #138245 | 230 kV | SOUTH CAROLINA ELECTRIC&GAS CO | IN SERVICE | 17.1 mi |
| #138631 | 230 kV | SOUTH CAROLINA ELECTRIC&GAS COMPANY | IN SERVICE | 17.8 mi |
| #167299 | 230 kV | SOUTH CAROLINA ELECTRIC&GAS CO | IN SERVICE | 31.2 mi |
| #127121 | 230 kV | SOUTH CAROLINA ELECTRIC&GAS CO | IN SERVICE | 38.2 mi |
| #104725 | 115 kV | SOUTH CAROLINA ELECTRIC&GAS COMPANY | IN SERVICE | 21.4 mi |
| #167300 | 115 kV | SOUTH CAROLINA ELECTRIC&GAS CO | IN SERVICE | 20.6 mi |
| #145698 | 115 kV | SOUTH CAROLINA ELECTRIC&GAS CO | IN SERVICE | 20.8 mi |
| #163828 | 115 kV | SOUTH CAROLINA ELECTRIC&GAS COMPANY | IN SERVICE | 0.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of YEMASSEE, 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 |
|---|---|---|---|---|---|---|---|
| CANADYS | Substation-Adjacent | SC | Dorchester County | 230 kV | 300 MW | 3.9 yrs | 66.3 |
| WEST MCINTOSH | Substation-Adjacent | GA | Effingham County | 500 kV | 1,000 MW | 5.8 yrs | 65.6 |
| UNKNOWN120914 | Substation-Adjacent | SC | Hampton County | 230 kV | 300 MW | 3.9 yrs | 64.7 |
| UNKNOWN120913 | Substation-Adjacent | SC | Colleton County | 230 kV | 300 MW | 3.9 yrs | 64.1 |
| YEMASSEE | Substation-Adjacent | SC | Colleton County | 230 kV | 300 MW | 3.9 yrs | 64.0 |
| UNKNOWN120907 | Substation-Adjacent | SC | Allendale County | 115 kV | 100 MW | 3.9 yrs | 63.7 |
| McIntosh | Brownfield | GA | Jasper County | 230 kV | 178 MW | 5.8 yrs | 63.4 |
| UNKNOWN167524 | Substation-Adjacent | SC | Jasper County | 230 kV | 300 MW | 3.9 yrs | 62.9 |
How does YEMASSEE compare with other substations in South Carolina?
South Carolina has 2,476 substation records in HIFLD, of which 54 carry a station name; the rest are unnamed tap points, risers and line ends. 33 named substations in the state are in YEMASSEE's 230–344 kV band (61% of named stations). 2 sit in a higher band. 2 named substations in South Carolina operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 230 kV.
Who owns the transmission lines at YEMASSEE?
The 10 connected lines listed above are owned by SCE&G, SOUTH CAROLINA ELECTRIC&GAS CO, SOUTH CAROLINA ELECTRIC&GAS COMPANY. Line voltages range from 115 kV to 230 kV. Their combined recorded length is about 201.1 miles.
How do candidate sites near YEMASSEE score?
The 8 highest-scoring candidate sites within about 25 miles range from 63 to 66 on the 0–100 DC Readiness scale. They fall in Dorchester County, Effingham County, Hampton County, Colleton County. The South Carolina average across 2,061 scored sites is 57.1. 1,124 of those South Carolina sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is YEMASSEE substation?
YEMASSEE has a maximum voltage of 230 kV and a minimum of 115 kV. That places it in the 230–344 kV band. The median named US substation in this dataset is 115 kV, so YEMASSEE is above the national midpoint.
How many transmission lines connect to YEMASSEE substation?
10 transmission lines terminate at or pass through YEMASSEE in the HIFLD line data. The connected lines listed here run at 230 kV, 115 kV. Together the listed lines cover about 201.1 miles.
Who owns YEMASSEE substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at YEMASSEE belong to SOUTH CAROLINA ELECTRIC&GAS CO, and others to SOUTH CAROLINA ELECTRIC&GAS COMPANY, SCE&G. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is YEMASSEE substation located?
YEMASSEE is in South Carolina at 32.6979, -80.8638. The datacenter candidate sites closest to it are in Dorchester County, Effingham County, Hampton County.
Are there datacenter candidate sites near YEMASSEE substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of YEMASSEE. The highest-scoring is CANADYS at 66/100. Across South Carolina, the average DC Readiness score is 57.1.
Other 230 kV substations in South Carolina
- CENTRAL TIE· 26 lines
- TIGER TIE· 26 lines
- NORTH GREENVILLE TIE· 21 lines
- PACOLET TIE· 18 lines
- ANDERSON· 16 lines
- PEACH VALLEY TIE· 15 lines
- CATAWBA 230KV SWITCHING STATION· 13 lines
- SHADY GROVE· 13 lines
- All named substations in South Carolina· 54 stations
- Datacenter candidate sites in South Carolina· 2,061 sites
- Brownfield and retired plant sites in South Carolina
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “YEMASSEE substation, South Carolina”, https://gridcensus.com/substations/south-carolina/yemassee-8afcf0bf (data as of June 29, 2026).
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
Every site and score for YEMASSEE substation, South Carolina is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.