Electrical Storm - Factors Driving SoCal's Recent Gas Price Surge

A perfect storm of hot weather, transportation constraints and limits on storage use recently sent natural gas prices in Southern California surging to the highest levels seen in that market going back to at least 2007. Spot prices at the SoCal Citygate hub averaged close to $40/MMBtu in late July and were again up over $20/MMBtu last week, levels that were several times higher than the national benchmark Henry Hub — and, for that matter, every other U.S. market hub — on the same day. Prices since then have retreated, but the whipsawing price action raises questions about what’s in store for SoCal this coming winter. Today, we analyze the factors behind the recent record prices and prospects for continued volatility at SoCal.

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The recent price spike at SoCal wasn’t our first inkling of trouble brewing in the California power and natural gas market. The Golden State has experienced radical shifts for the better part of this decade, from the permanent shutdown in 2013 of the 2,250-MW San Onofre nuclear facility (see Play Me a Songs Mr. Generator Man and California Schemin’) — a major power source for the Los Angeles metro area — to ­­­an aggressive expansion of renewable energy (first wind, then a lot of solar; see Here Comes the Sun), which also involved shutting down older, less-efficient gas-fired power plants, and more recently the regulatory restrictions on SoCal Gas’s Aliso Canyon gas storage facility after it sprung a leak in 2015. All in all, with renewables increasing market share and regulatory caps on storage injections and withdrawals, these factors have lowered gas usage in the region but — counterintuitively — not gas prices, and, what’s more, price volatility in the local gas market has increased.

That stark reality has been on full display these past few weeks. As Figure 1 illustrates, spot gas prices at the SoCal Citygate trading hub (orange line) — representing deliveries to SoCal Gas’s local distribution system — rallied to double-digit levels in late July (2018) and peaked with a daily average of $39/MMBtu on July 24, according to the NGI Daily Gas Price Index. That compares with an average of about $5/MMBtu in the first half of July, and about a $3.20 average in both June 2018 and the June-July timeframe in 2017. Not only was that $39/MMBtu mark the highest price seen since at least 2007, but also the highest price in the country at the time. The national benchmark Henry Hub in Louisiana on the same day, posted a $2.70/MMBtu settlement, leaving a $36 differential to SoCal.

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