Data last collected:
PowerPlantFactsEvidence report · prepared 19 October 2026https://powerplantfacts.com/entity/766
EIA plant 766
Pearl City · Honolulu · HI
Waiau
Operated by Hawaiian Electric Co Inc
Published location
Where is Waiau?
This locator uses the coordinates in the approved source record. It shows geographic context, not a site boundary, safety zone or property-risk area.
21.388997, -157.961518
Open the interactive map ↗Map data © OpenStreetMap contributors
Capacity is not generation. Nameplate MW describes equipment; annual MWh describes recorded output. Proposed and retired units are not added to operating capacity.
Equipment mix
Operating capacity by technology
Grouped from this plant’s represented generator records. Use the HI plant index for regional peers.
See the evidence
Electricity output across the year
Monthly net generation shows the seasonal shape of this plant's represented output. A negative value is retained when the source reports net consumption.
1131,031
282,758
365,444
464,764
571,802
687,965
789,327
8104,814
975,427
1081,027
1155,156
1281,758
MWh net generation · 2024 final edition · EIA 923 represented operating rows. 12 of 12 supplied rows shown; 0 missing values omitted. Months with no reported numeric value are omitted, not treated as zero.
Read the chart as a table
| Record | MWh net generation |
|---|---|
| 1 | 131,031 |
| 2 | 82,758 |
| 3 | 65,444 |
| 4 | 64,764 |
| 5 | 71,802 |
| 6 | 87,965 |
| 7 | 89,327 |
| 8 | 104,814 |
| 9 | 75,427 |
| 10 | 81,027 |
| 11 | 55,156 |
| 12 | 81,758 |
2024 monthly net generation
| Month | Net generation |
|---|---|
| 1 | 131,031 MWh |
| 2 | 82,758 MWh |
| 3 | 65,444 MWh |
| 4 | 64,764 MWh |
| 5 | 71,802 MWh |
| 6 | 87,965 MWh |
| 7 | 89,327 MWh |
| 8 | 104,814 MWh |
| 9 | 75,427 MWh |
| 10 | 81,027 MWh |
| 11 | 55,156 MWh |
| 12 | 81,758 MWh |
Operating generators
| ID | Technology | Fuel | MW | Status |
|---|---|---|---|---|
| W7 | Petroleum Liquids | RFO | 81.6 | OP |
| W8 | Petroleum Liquids | RFO | 81.6 | OP |
| W5 | Petroleum Liquids | RFO | 54.4 | OP |
| W6 | Petroleum Liquids | RFO | 54.4 | OP |
| W10 | Petroleum Liquids | DFO | 51.3 | OP |
| W9 | Petroleum Liquids | DFO | 51.3 | OP |
| W3 | Petroleum Liquids | RFO | 50 | OP |
| W4 | Petroleum Liquids | RFO | 50 | OP |
Continue exploring
Similar-capacity plants in the same state
Identity, technology and limitations
EIA plant ID
766
Sector
Electric Utility
Water source
Pearl Harbor
Data edition
2024-final
Use this record
Questions this evidence can answer
01What exactly is this record?
Use the name, place, date and identifiers above to confirm that you have the right Waiau power plant: capacity and generation | PowerPlantFacts record.
02What does the evidence establish?
Read the reported values with their units, coverage dates and source notes. Keep observed facts separate from estimates or interpretation.
03What should I verify next?
Follow the primary-source links and check the limitations before using this evidence for a decision, comparison or citation.
A closer look at Waiau
Variation in the published months
Across 12 numeric monthly generation entries, 1 has the highest recorded value (131,031 MWh) and 11 the lowest (55,156 MWh). Their difference is 75,875 MWh. Missing months have not been treated as zero.
Reading the MW column
In the 8 numeric rows displayed in this table, MW ranges from 50 (W3, W4) to 81.6 (W7, W8). The difference is 31.6 in the column's stated units. This summary covers the displayed rows and retains the table's period and scope.
Generator capacity in different operating conditions
| Generator ID | Technology | Nameplate MW | Summer MW | Winter MW | Minimum load MW |
|---|---|---|---|---|---|
| W10 | Petroleum Liquids | 51.3 | 51.2 | 51.2 | 6.0 |
| W3 | Petroleum Liquids | 50.0 | 47.2 | 47.2 | 20.0 |
| W4 | Petroleum Liquids | 50.0 | 47.7 | 47.7 | 20.0 |
| W5 | Petroleum Liquids | 54.4 | 51.9 | 51.9 | 23.0 |
| W6 | Petroleum Liquids | 54.4 | 51.8 | 51.8 | 20.0 |
| W7 | Petroleum Liquids | 81.6 | 77.8 | 77.8 | 20.0 |
| W8 | Petroleum Liquids | 81.6 | 77.8 | 77.8 | 20.0 |
| W9 | Petroleum Liquids | 51.3 | 51.2 | 51.2 | 6.0 |
EIA-860 2024 final source. Ratings describe capacity, not actual generation or availability. Missing ratings are not zero.
Source: US Energy Information Administration Form EIA-860 2024 plant and operable-generator workbooks; archive 2024. US EIA-authored information is generally public domain; cite EIA, preserve third-party exceptions, changes and no-endorsement context. Source-specific derived data.