RILEY
SubstationMaine · CENTRAL MAINE POWER CO
At a glance
RILEY is an electric transmission substation in Maine, on CENTRAL MAINE POWER CO's transmission network. It is classified as sub-transmission (115 kv) and connects 5 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #102927 | 115 kV | CENTRAL MAINE POWER CO | IN SERVICE | 0.4 mi |
| #111248 | 115 kV | CENTRAL MAINE POWER CO | IN SERVICE | 7.2 mi |
| #116678 | 115 kV | CENTRAL MAINE POWER CO | IN SERVICE | 4.9 mi |
| #132825 | 115 kV | CENTRAL MAINE POWER CO | IN SERVICE | 0.4 mi |
| #125673 | — | CENTRAL MAINE POWER CO | IN SERVICE | 2.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of RILEY, 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 |
|---|---|---|---|---|---|---|---|
| LARRABEE ROAD | Substation-Adjacent | ME | Androscoggin County | 345 kV | 600 MW | 4.3 yrs | 64.5 |
| GULF ISLAND | Substation-Adjacent | ME | Androscoggin County | 115 kV | 100 MW | 4.3 yrs | 58.2 |
| UNKNOWN133734 | Substation-Adjacent | ME | Androscoggin County | 115 kV | 100 MW | 4.3 yrs | 58.1 |
| PUDDLEDOCK RD | Substation-Adjacent | ME | Kennebec County | 115 kV | 100 MW | 4.3 yrs | 57.9 |
| TAP136745 | Substation-Adjacent | ME | Androscoggin County | 115 kV | 100 MW | 4.3 yrs | 57.8 |
| UNKNOWN133016 | Substation-Adjacent | ME | Kennebec County | 115 kV | 100 MW | 4.3 yrs | 57.8 |
| RILEY | Substation-Adjacent | ME | Androscoggin County | 115 kV | 100 MW | 4.3 yrs | 57.6 |
| NORWAY | Substation-Adjacent | ME | Androscoggin County | 115 kV | 100 MW | 4.3 yrs | 57.5 |
How does RILEY compare with other substations in Maine?
Maine has 334 substation records in HIFLD, of which 67 carry a station name; the rest are unnamed tap points, risers and line ends. 50 named substations in the state are in RILEY's 115–229 kV band (75% of named stations). 14 sit in a higher band. 14 named substations in Maine operate at 345 kV or above. The highest voltage recorded in the state is 345 kV, and the state median is 115 kV.
Who owns the transmission lines at RILEY?
The 5 connected lines listed above are owned by CENTRAL MAINE POWER CO. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 15 miles.
How do candidate sites near RILEY score?
The 8 highest-scoring candidate sites within about 25 miles range from 58 to 65 on the 0–100 DC Readiness scale. They fall in Androscoggin County, Kennebec County. The Maine average across 1,183 scored sites is 53.5. 134 of those Maine sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is RILEY substation?
RILEY has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so RILEY is at the national midpoint.
How many transmission lines connect to RILEY substation?
5 transmission lines terminate at or pass through RILEY in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 15 miles.
Who owns RILEY substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at RILEY belong to CENTRAL MAINE POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is RILEY substation located?
RILEY is in Maine at 44.5075, -70.2481. The datacenter candidate sites closest to it are in Androscoggin County, Kennebec County.
Are there datacenter candidate sites near RILEY substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of RILEY. The highest-scoring is LARRABEE ROAD at 65/100. Across Maine, the average DC Readiness score is 53.5.
Other 115 kV substations in Maine
- WYMAN HYDRO· 8 lines
- GRAHAM· 7 lines
- LOUDEN· 7 lines
- BATH· 5 lines
- GRAHAM 46KV· 5 lines
- KEENE ROAD· 5 lines
- KIMBALL ROAD· 5 lines
- LIVERMORE FALLS· 5 lines
- All named substations in Maine· 67 stations
- Datacenter candidate sites in Maine· 1,183 sites
- Brownfield and retired plant sites in Maine
- 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, “RILEY substation, Maine”, https://gridcensus.com/substations/maine/riley-4e0682bc (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 RILEY substation, Maine 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.