Idaho Public Utilities
Commission
Case No. AVU-G-12-01,
Order No. 32471
February
29, 2012
Contact:
Gene Fadness (208) 334-0339, 890-2712
Avista gas rates decline
March 1 with WACOG adjustment
The Idaho Public Utilities
Commission is accepting an application by Avista Utilities to adjust the
variable portion of its natural gas tariff from 41.8 cents per therm to 36.2
cents, reducing an average residential customer’s bill by about $3.46 per month,
or about 5.7 percent. Large commercial
customers’ rates will decrease by about 7.3 percent. The rate change becomes effective March
1.
Avista serves about 120,000
electric and natural gas customers in northern Idaho.
The commission approved the
application without the full 30-days’ notice required for rate changes and accompanying
public comment period so that customers may more immediately benefit from the
decrease.
Natural gas utilities file a
Purchased Gas Cost adjustment (PGA) at least once a year. The PGA varies
largely due to market conditions. (Electric
utilities annually file a similar Power Cost Adjustment – PCA – that reflects
the variable component of power supply costs.)
Increases or decreases to rates as a result of the PGA or PCA do not
impact company earnings.
The commodity portion of a natural
gas bill is called the WACOG, or Weighted Average Cost of Gas. The commission directs the gas utilities it
regulates to amend their WACOG if gas prices materially deviate from the
currently approved commodity price. Commission
staff compared Avista’s proposed WACOG to the Natural Gas Exchange’s and New
York Market Exchange’s futures prices for basins from which Avista gets its gas
and believes lowering the WACOG is reasonable.
The WACOG is a significant
portion of a customer’s total bill. Beginning
March 1, the WACOG will be 36.2 cents of a residential customer’s rate of 85.9
cents per therm. The non-WACOG portion of the 85.9 cents per therm represents
costs that are fixed, such as capital investment in infrastructure and
operations and maintenance. An Avista
residential and small commercial customer uses an average 62 therms per
month.
The commission commended the
company for promptly seeking to amend its WACOG as market conditions
changed.
A
full text of the commission’s order, along with other documents related to this
case, is available on the commission’s Web site at www.puc.idaho.gov. Click on “File Room”
and then on “Gas Cases” and scroll down to Case No. AVU-G-12-01.