Canadian natural gas exports are set to increase to the U.S. Pacific Northwest and California in the next 10 years, according to the developer of a proposed C$355.5 million ($267 million) pipeline expansion project.

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The proposed West Path 2023 expansion of TC Energy Corp.’s pipeline grid in Alberta and British Columbia, Nova Gas Transmission Ltd. (NGTL), is supported by shipper service bookings of 166 MMcf/d, NGTL said in a filing to the Canada Energy Regulator (CER).

Driven primarily by production from the Western Canada Sedimentary Basin, operators are “seeking increased access to export markets and the ability to compete for downstream market share,” said the NGTL filing. “Many plays in the WCSB, such as the Montney and Deep Basin, can compete economically.”

In addition to low-cost supplies, demand patterns create cross-border gas trade growth opportunities, NGTL management said.

“The Pacific Northwest and California markets have peak gas requirements in the spring and summer months, which complement NGTL intra-basin demand that peaks in the winter, making these markets key for WCSB production,” management added.

The CER filing predicted that NGTL flows to the Pacific Northwest and California would grow by 25% to 3 Bcf/d by 2030, from the current 2.4 Bcf/d.

The forecast accounts for climate change policies aimed at reducing reliance on fossil fuels to cut carbon emissions blamed for global warming. Combined California and Pacific Northwest gas demand is projected to fall by about 7% to 6.9 Bcf/d over the next 10 years, from the current 7.4 Bcf/d.

Only marginal change is expected in U.S. West Coast residential and commercial consumption. The dominant gas demand drivers — industry and power generation — are forecast to total 4.3 Bcf/d in 2030, which would be down 8.5% from the current 4.7 Bcf/d.

Power generation is expected to evolve slowly and initially favor gas-fired plants, while U.S. state and national environmental policies are expected to nurture renewable wind and solar electricity sources into large-scale supplies, NGTL management said.

“An estimated 900 MW of new gas additions to replace aging gas-fired units in the region and the retirement of the 2,300 MW Diablo Canyon nuclear plant by the middle of the decade are expected to support gas-fired power generation in the short to intermediate term,” management said. “In the long-term, legislation to increase renewable portfolio standard regulations set by state governments will lessen the gas demand in the region gradually over time.”

NGTL’s proposed project would add 48-inch diameter pipe to a mainline southwest of Calgary to increase gas flows destined for the Pacific Northwest and California. Deliveries are scheduled to start in November 2023.

The new addition would follow a C$2.3 billion ($1.7 billion) NGTL project that received regulatory approval last week for completion in 2021 and 2022, and a C$193 million ($145 million) 100 MMcf/d expansion awaiting CER approval.