Adjusting For The Weather

The method utilized is for the constant elasticity E.

First, the value for “A” is computed in the formula:

Actual Q = A(Actual HDD or CDD)^E.

Then, given “A,”

if normal Q = A(Normal HDD or CDD)^E.

The weather impact or adjustment is then computed as,

adjustment = (if normal Q) – (actual Q).

Sector and Source: Residential: Delivered Energy

HDD Weather Elasticity = .3848

Year Actual %d(HDD) Adjustment If Normal

1995 10.46122 100.15 -.0062 10.455

1996 11.12847 104.18 -.1739 10.9546

1997 10.66744 100.4 -.0162 10.6512

1998 10.23326 87.33 .5474 10.7807

1999 10.64985 92.15 .3403 10.9901

2000 11.1721 98.59 .0614 11.2335

2001 10.91906 93.35 .2931 11.2122

2002 11.16996 94.69 .2367 11.4067

2003 11.52878 98.59 .0634 11.5922

2004 11.39384 94.83 .2353 11.6291

2005 11.59748 93.46 .3059 11.9034