The September average price per gallon of regular gasoline in California rose 20 cents from August to $3.81.  The California premium above the average for the US other than California ($2.53) jumped to $1.27, a 50.3% difference.

The primary factor behind the California price rise was production problems at three of the state’s refineries, again illustrating the vulnerability of consumers and employers to unexpected cost shifts as a result of state regulations that severely limit access to alternative supply sources. 

Compounding this situation was the rise in world oil prices coming from the attacks on the Saudi facilities.  While the rest of the nation was little affected by this supply disruption as a result of access to the expanding domestic production, California instead has moved in the opposite direction and become more dependent on imports, shifting the related higher paying jobs and greenhouse gas production from within the state to other countries.  California reliance on foreign crude oil imports rose from 47.7% in 2010 (the year the early actions under AB 32 were implemented) to 57.5% in the latest 2018 data from the Energy Commission.  California production declines in both years were moderated by continuing tanker imports of crude from Alaska.  US Energy Information Administration shows foreign crude oil imports to the other states dropped from 64.6% to 39.7% in the same period.  

In September, California had the highest gasoline price among the states and DC.  Californians paid $1.55 a gallon more (68% more) than consumers in Mississippi and Louisiana, the states with the lowest price.

The September average price per gallon of diesel in California rose 4 cents from August to $3.96.  The California premium above the average for the US other than California ($2.91) rose to $1.05, a 36.2% difference.

In September, California had the 2nd highest diesel price among the states and DC, behind only Hawaii.

The cost premium above the US (other than California) average price for regular gasoline ranged from $1.18 in the Sacramento Region (average September price of $3.71), to $1.43 in Central Sierra Region (average September price of $3.96).

California average Residential Price for the 12 months ended July 2019 was 19.23 cents/kWh, 53.0% higher than the US average of 12.57 cents/kWh for all states other than California.  California's residential prices remained the 7th highest in the nation.

For the 12 months ended July 2019, the average annual Residential electricity bill in California was $1,236, or 24.3% higher ($242) than the comparable bill in 2010 (the year the AB 32 implementation began with the Early Action items).  In this same period, the average US (less CA) electricity bill for all the other states grew only 2.8% ($38).

Residential bills, however, vary widely by region. The updated data from Energy Commission for 2018 shows the estimated annual household usage was as much as 65% higher in the interior regions compared to the milder climate coastal areas.

For the 12 months ended July 2019, California's higher electricity prices translated into Residential ratepayers paying $5.8 billion more than the average ratepayers elsewhere in the US using the same amount of energy.

California average Commercial Price for the 12 months ended July 2019 was 16.63 cents/kWh, 64.5% higher than the US average of 10.11 cents/kWh for all states other than California.  California's commercial prices were again the 6th highest in the nation.

California average Industrial Price for the 12 months ended July 2019 was 13.38 cents/kWh, 105.5% higher than the US average of 6.51 cents/kWh for all states other than California.  California's industrial prices were again the 6th highest in the nation.

For the 12 months ended July 2019, California's higher electricity prices translated into Commercial & Industrial ratepayers paying $10.6 billion more than ratepayers elsewhere in the US using the same amount of energy.