Diablo

500 Newhalem Street, Rockport, WA 98283

Plant Summary Information

Diablo is ranked #48 out of 131 power plants in Washington in terms of total annual net electricity generation.

Diablo is comprised of 4 generators and generated 13.2 GWh during the 3-month period between September 2024 to December 2024.

Plant Name	Diablo
Utility Name	City of Seattle - (WA)
Location	Whatcom County, WA
Initial Operation Date	October 1936
Last Update	Dec 2024
Annual Generation	361.4 GWh
Annual Consumption	1.4 M MMBtu
Ranked #1,656 out of 12,288 Power Plants Nationwide
Ranked #129 out of 1,323 Water Power Plants Nationwide
Ranked #48 out of 131 Washington Power Plants
Ranked #24 out of 68 Washington Water Power Plants
Fuel Types	Water

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Summary Information
Plant Name	Diablo (6432)
Plant Address	500 Newhalem Street, Rockport, WA 98283
Utility	City of Seattle - (WA) (16868)
Latitude, Longitude	48.71385, -121.13174
Generation Dates on File	Jan 2001 to Dec 2024
Initial Operation Date	October 1936
Annual Generation	361.4 GWh
Fuel Types	Water

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	WECC
Balancing Authority	Seattle City Light (SCL)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Skagit River
Ash Impoundment	No
Transmission / Distribution Owner	City of Seattle - (WA) (16868) WA
Grid Voltage	230.00 kV
Energy Storage	No

* Data obtained from the 2024 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	DIABLO_2_GEN32GNODE
RTO ISO Location Designation For Reporting Wholesale Sales Data	DIABLO_2_GEN32GNODE
Nameplate Capacity	90 MW
Nameplate Power Factor	0.9
Summer Capacity	90 MW
Winter Capacity	90 MW
Minimum Load	1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	October 1936
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Other Planned Modifications	Yes
Other Modifications	October 2027
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	1.2 MW
Nameplate Power Factor	0.8
Summer Capacity	1.2 MW
Winter Capacity	1.2 MW
Minimum Load	0.5 MW
Uprate/Derate Completed	No
Status	Operating

First Operation Date	October 1936
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Other Planned Modifications	Yes
Other Modifications	July 2029
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	1.2 MW
Nameplate Power Factor	0.8
Summer Capacity	1.2 MW
Winter Capacity	1.2 MW
Minimum Load	0.5 MW
Uprate/Derate Completed	No
Status	Operating

First Operation Date	October 1936
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Other Planned Modifications	Yes
Other Modifications	December 2029
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
RTO ISO LMP Node Designation	DIABLO_2_GEN31GNODE
RTO ISO Location Designation For Reporting Wholesale Sales Data	DIABLO_2_GEN31GNODE
Nameplate Capacity	90 MW
Nameplate Power Factor	0.9
Summer Capacity	90 MW
Winter Capacity	90 MW
Minimum Load	1 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	April 1937
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	1H
Other Planned Modifications	Yes
Other Modifications	October 2026
Multiple Fuels	No

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#119	Pit 4	Big Bend, CA	388.1 GWh
#120	Norris Dam	Norris, TN	386.9 GWh
#121	Keswick	Redding, CA	380.3 GWh
#122	James B Black	Big Bend, CA	380.1 GWh
#123	Don Pedro	La Grange, CA	377.1 GWh
#124	Robert S Kerr	Keota, OK	370.3 GWh
#125	Table Rock	Branson, MO	367.8 GWh
#126	H M Jackson	Sultan, WA	365.7 GWh
#127	Belden	Belden, CA	365.1 GWh
#128	Pelton	Madras, OR	361.8 GWh
#130	Caribou 2	Belden, CA	357.9 GWh
#131	Big Creek 4	North Fork, CA	356.7 GWh
#132	Mitchell Dam	Verbena, AL	355.5 GWh
#133	Big Creek 2	Auberry, CA	355.2 GWh
#134	Smithland Hydroelectric Plant	Smithland, KY	351.9 GWh
#135	Pensacola	Langley, OK	349.1 GWh
#136	Bartletts Ferry	Salem, AL	348.0 GWh
#137	Cordell Hull	Carthage, TN	344.8 GWh
#138	S C Moore	Littleton, NH	341.5 GWh
#139	Cherokee Dam	Rudledge, TN	341.4 GWh

Below are closest 20 power plants surrounding Diablo.

Plant Name	Plant Location	Annual Generation	Distance
Arlington Microgrid	Arlington, WA	532.0 MWh	60.5 mi
Chelan	Wenatchee, WA	328.0 GWh	79.6 mi
Darrington	Darrington, WA	17.0 GWh	37.4 mi
Encogen	Bellingham, WA	528.9 GWh	61.8 mi
Ferndale Generating Station	Ferndale, WA	1.7 TWh	71.2 mi
Fredonia	Mt Vernon, WA	311.0 GWh	62.2 mi
Gorge	Rockport, WA	706.9 GWh	3.7 mi
H M Jackson	Sultan, WA	365.7 GWh	63.9 mi
HF Sinclair Puget Sound Refining	Anacortes, WA	1.0 TWh	67.4 mi
Koma Kulshan	Concrete, WA	24.8 GWh	27.1 mi
Lower Baker	Concrete, WA	326.7 GWh	30.1 mi
Nooksack Hydro	Glacier, WA	20.1 GWh	33.8 mi
Ross	Rockport, WA	405.6 GWh	3.2 mi
Sierra Pacific Burlington Facility	Mt Vernon, WA	151.4 GWh	62.3 mi
South Fork Tolt	North Bend, WA	44.6 GWh	76.3 mi
Sumas Power Plant	Sumas, WA	834.9 GWh	55.3 mi
Upper Baker	Concrete, WA	317.8 GWh	25.9 mi
Wells	Chelan, WA	3.6 TWh	78.7 mi
Whitehorn	Blaine, WA	230.3 GWh	74.7 mi
Youngs Creek Hydroelectric Project	Monroe, WA	18.7 GWh	70.7 mi