Mason PUD 3 is upgrading it's Pioneer Substation from a 25 MVA unit to a 40 MVA unit along with new relay panels that will allow higher electric lo…
Office of NEPA Policy and Compliance
September 2, 2025
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Mason PUD 3 is upgrading it's Pioneer Substation from a 25 MVA unit to a 40 MVA unit along with new relay panels that will allow higher electric loads to remain energized without causing interruptions during extreme winter storm events.