🌬️ SunZia Transmission
America's largest clean energy infrastructure project under construction
🚧 UNDER CONSTRUCTIONLast updated: March 2026
DeveloperPattern Energy
LocationNew Mexico → Arizona
Capacity3,000 MW (transmission) + 3,500 MW (wind)
Estimated Cost$11 billion
Current StatusUnder construction; legal challenges cleared
Expected Online2026
Technology±525 kV HVDC
Route Length550 miles
$11B
Total Investment
550 mi
Route Length
3,000 MW
Capacity
±525 kV
HVDC Voltage
Project Basics
- Developer: Pattern Energy
- Technology: ±525 kV HVDC
- Source: New Mexico wind (3.5 GW SunZia Wind)
- Destination: Pinal Central, Arizona
- Target COD: 2026
Why It Matters
SunZia is one of the largest clean energy infrastructure projects in U.S. history, now under construction. It will deliver New Mexico wind power to Arizona and California markets, demonstrating that long-distance transmission can unlock stranded renewable resources.
📅 Timeline
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Jan 2026Federal court clears path for SunZia after Trump administration reversal attempt
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2025SunZia Wind project (3.5 GW) targets commissioning in 2026; construction advancing
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2024CAISO approves SunZia as participating transmission owner; construction advances
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2023Construction begins on transmission line and SunZia Wind project
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2023Pattern Energy secures full financing for $11B project
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2015BLM issues Record of Decision and right-of-way grant
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2008SunZia project proposed by SouthWestern Power Group
📰 Related Coverage
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