Mayfield

Power plant · Hydro

Key facts

Power plant · Hydro Operating

Commissioned: 1963
Net generation, 2025: 602,506 MWh
Grid: 240 kV to City of Tacoma - (WA) (TPWR)
Location: Lewis County, Washington
Operated by: City of Tacoma - (WA)SourceEIA-860M Preliminary Monthly Electric Generator Inventory

Net generation MWh by year, 2001 to 2025

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All 6 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory

Attributes
Attribute	Value
Gem	Unit ids G100000603900 Location id L100000603862
Grid	Nerc region WECC Report year 2025 Grid voltage kv 240 Transmission owner City of Tacoma - (WA) Balancing authority code TPWR Balancing authority name City of Tacoma, Department of Public Utilities, Light Division
Fuel burned (MMBtu), 2025	2,055,751
Capacity factor, 2025	0.425
Net generation (MWh), 2025	602,506
Balancing authority code	TPWR

4 sources

Sources

EIA-860MOpen license · retrieved Nov 4, 2026
GEMOpen license, with credit · retrieved Oct 26, 2026Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
EIAOpen license · retrieved Nov 1, 2026Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
EIA-860M Preliminary Monthly Electric Generator Inventory