The shut-in of the Aliso Canyon natural gas storage facility continued supporting Western energy prices. Both natural gas and power prices were generally higher at the end of Sept. 30 to Oct. 7 trading.

Inventory shut-in maintenance, which started Sept. 28, is scheduled to conclude Oct. 13. Both injection and withdrawal capacity will be unavailable until maintenance is finished.

The shut-in is reducing injections by 545 MMcf per day, the U.S. Energy Information Administration said in its weekly report, and "reduced the ability of the natural gas system in the region to balance through storage."

Western natural gas hub prices added between 2 cents and $1.66 by the end of trading after most hubs peaked at the end of Oct. 5 trading. Both PG&E CityGate and SoCal CityGate, for example, traded at $7.46/MMBtu Oct. 5. Alberta gas, which ended at $5.17/MMBtu, gained $1.66 by Oct. 7.

PG&E CityGate natural gas proved the exception among Western natural gas hubs, eroding by 3 cents. It posted the highest regional price at $7.01/MMBtu.

The mean price of Western natural gas was $5.93/MMBtu by Oct. 7.

Southern California Gas reported that Line 4000 returned to service at a higher operating pressure effective Oct. 1. In an ENVOY posting, the utility said the firm backbone-transportation service capacity increased to 1,290 MMcfd in the Northern Zone and to 800 MMcfd in the Needles/Topock Area Zone. Kramer Junction capacity remains at 550 MMcfd.

Henry Hub natural gas values increased 14 cents in trading to end at $5.69/MMBtu.

National working natural gas in storage was 3,288 Bcf as of Oct. 1, according to EIA estimates, which is a net increase of 118 Bcf compared with the previous week.

Total national natural gas consumption rose by almost 4 percent week over week. National electric power sector demand increased by 2.4 Bcf per day, or roughly 8.3 percent, week over week.

Meanwhile, Western power prices generally increased in trading. Mid-Columbia daytime power gained the most, up $11.70 to $77.80/MWh. Palo Verde peak proved the exception, ending even at $58/MWh by Oct. 7.

Off-peak power prices rose by between $1.75 and as much as $11.50 at the California-Oregon Border hub. Nighttime power values ranged from $54.75/MWh at Palo Verde to $65.50/MWh at COB.

California ISO demand reached 32,974 MW Oct. 1, which should be the week's high. Northwest Power Pool demand reached 62,108 MW Oct. 4, which should be the week's high.

CAISO renewables reached 13,661 MW Oct. 1, meeting roughly 41 percent of demand. That same day, solar generation contributed 11,919 MW, or 36 percent, and imports 9,992 MW, or about 30 percent.

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