Trentwood Substation - 115 kV Substation in Spokane Valley, Washington

Trentwood Substation is an operational electrical substation located in Spokane Valley, Washington, United States. Owned and operated by Avista, the facility plays a key role in the regional electrical infrastructure, stepping down transmission voltage for local distribution. The substation operates at 115 kV, a common voltage level for sub-transmission and distribution substations in the United States. As part of Avista's network, it is subject to NERC reliability standards and FERC regulation, ensuring grid stability and compliance with North American electric reliability requirements. Located in an urban area near Spokane, the substation supports residential, commercial, and industrial customers. Its operational status and voltage level indicate a medium-scale facility critical to local grid reliability. The site's position within Avista's service territory contributes to the region's energy resilience.

The substation is situated in an urban setting in Spokane Valley, where electrical infrastructure must balance reliability with environmental considerations. The 115 kV voltage level suggests a role in distributing power to local loads, with potential impacts on land use and electromagnetic fields. Avista's operations are subject to state and federal environmental regulations, including those related to stormwater management and hazardous materials handling.