PNW · 8-K · 20260807PR000044

Transmission Investment Strategy

PINNACLE WEST CAPITAL CORP · 2026-08-07 · Importance 64 · Surprise 42 · In source text

APS expects cumulative transmission capital expenditures of more than $6 billion during the 2026-2035 planning period. The plan includes more than 600 miles of 345-kV-and-above lines and more than 300 miles of 230-kV lines. Major projects include Helios to Milligan at approximately 23 miles of 230-kV lines, Pinnacle Peak to Ocotillo at approximately 50 miles of 230-kV lines, and the Cotton Transmission Corridor at approximately 80 miles of 230-kV lines. The company expects annual FERC Formula rate recovery and wheeling revenue to support the investment program.

Key facts

• Cumulative Transmission CapEx 2026-2035 projected to be $6 billion + source
• Company is anchor shipper on new gas pipeline expected to be in service by late 2029 source
• Major transmission project Helios to Milligan: ~23 mi/230kV estimated in-service 2027 source
• Major transmission project Pinnacle Peak to Ocotillo: ~50 mi/230kV estimated in-service 2030 source
• Major transmission project Cotton Transmission Corridor: Panda to Freedom Lines #2 & #1: ~80 mi/230kV estimated in-service 2030/2031 source
• Major transmission project Jojoba to Rudd: ~29 mi/500kV estimated in-service 2031 source

Impact estimates