Great Basin Gas Advances $1.7 Billion Nevada Expansion After Open Season Close

Great Basin Gas Transmission closed its second open season for the $1.7 billion 2028 Expansion Project in Northern Nevada, securing nearly 800 million cubic feet per day in capacity requests as demand for natural gas infrastructure continues to rise.

LAS VEGAS (P&GJ) — Great Basin Gas Transmission Company, a subsidiary of Southwest Gas Corporation, has closed its Second Supplemental Open Season for the planned 2028 Expansion Project in Northern Nevada, executing binding precedent agreements with shippers that underscore strong regional demand for new natural gas infrastructure.

The open season, held from Nov. 11, 2025, followed earlier rounds conducted this year to accommodate continued shipper interest. The agreements mark another step toward expanding Great Basin’s existing 898-mile transmission system, which serves communities from the Idaho-Nevada border to Reno, Sparks, Carson City, and Lake Tahoe.

“Demand for reliable and flexible natural gas transportation service in Northern Nevada continues to grow, and the executed precedent agreements reflect that demand,” said Karen S. Haller, President and CEO of Southwest Gas Holdings. “We look forward to collaborating with shippers as we move forward with the FERC pre-filing process and align our infrastructure planning with the region's growing energy needs.”

Pending Federal Energy Regulatory Commission (FERC) approval, the company estimates:

• Total capacity requests of nearly 800 million cubic feet per day
• A $1.7 billion capital investment
• Spending phased at roughly 20% in 2026, 25% in 2027, and 55% in 2028
• Expected in-service date of Nov. 1, 2028
• Projected annual incremental margin of $215–$245 million

The expansion aims to enhance regional gas reliability and support economic development across Northern Nevada, where population and industrial growth are increasing energy demand.