Electric Substations in Hawaii
14 named substations in Hawaii, with the highest-voltage facilities listed first. Each substation profile shows voltage class, connected transmission lines, and the datacenter candidate sites closest to it.
At a glance
How is Hawaii's substation network split by voltage?
By maximum voltage, the named substations break down as 13 at 115–229 kV; 1 withvoltage not recorded. 0% of Hawaii's named substations operate at 345 kV or above, against 8% across all 16,654 named US substations. The state median of 138 kV is above the national median of 115 kV.
How does Hawaii compare with other states?
Hawaii ranks 51st of 50 states and DC by number of named substations. It also has 252 scored datacenter candidate sites with an average DC Readiness score of 50 (national average 53), and an average power sub-score of 34.2 against 37.4 nationally.
Which substations in Hawaii have the highest voltage?
| Substation | Max voltage | Connected lines | Line owner |
|---|---|---|---|
| AES | 138 kV | 4 | HAWAIIAN ELECTRIC CO INC |
| CEIP | 138 kV | 5 | HAWAIIAN ELECTRIC CO INC |
| EWA NUI | 138 kV | 4 | HAWAIIAN ELECTRIC CO INC |
| HAIAWA | 138 kV | 5 | HAWAIIAN ELECTRIC CO INC |
| KAHE 1 | 138 kV | 4 | HAWAIIAN ELECTRIC CO INC |
| KAHE 2 | 138 kV | 5 | HAWAIIAN ELECTRIC CO INC |
| KALAELOA | 138 kV | 2 | HAWAIIAN ELECTRIC CO INC |
| KEWALO | 138 kV | 2 | HAWAIIAN ELECTRIC CO INC |
| KOOLAU | 138 kV | 7 | HAWAIIAN ELECTRIC CO INC |
| MAKALAPA | 138 kV | 3 | HAWAIIAN ELECTRIC CO INC |
| PUKELE | 138 kV | 2 | HAWAIIAN ELECTRIC CO INC |
| WAHIAWA | 138 kV | 4 | HAWAIIAN ELECTRIC CO INC |
| WAIAU 1 | 138 kV | 7 | HAWAIIAN ELECTRIC CO INC |
| WAIAU 2 | — | 0 | — |
Every named substation in Hawaii
All 14 named substations, grouped by voltage band.
voltage not recorded · 1
Frequently asked questions
How many electric substations are in Hawaii?
HIFLD records 158 substations in Hawaii, of which 14 carry a station name. That is the 51st-most named substations of any state in the dataset.
What is the highest-voltage substation in Hawaii?
13 named substations in Hawaii share the top voltage of 138 kV, including AES, CEIP, EWA NUI.
Which substation in Hawaii connects the most transmission lines?
KOOLAU has the most connected transmission lines of the named substations listed here, with 7 at up to 138 kV.
How many substations in Hawaii are 345 kV or higher?
0 of 14 named substations (0%) operate at 345 kV or above, compared with 8% nationally.
How many datacenter candidate sites in Hawaii are at substations?
57 of the 252 scored candidate sites in Hawaii are substation sites — locations generated at an existing substation. Scored sites across Hawaii average 50 on the 0–100 DC Readiness scale, against 53 nationally.
Looking for a specific record? The directory lists every substation in Hawaii, A to Z.
More on Hawaii, and states with similar counts
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, “Electric substations in Hawaii”, https://gridcensus.com/substations/hawaii (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
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Every site and score for substations in Hawaii 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.