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Slide 7 of 27

Heating Degree-Days

The forecast numbers are based on the 30-year average temperature pattern shown in solid green.

This shows how the winter of 1996/97 fell short of average, and how very warm the winter of 1997/98 was, reflecting El Nino influences.

Roughly speaking, the probability of seeing colder weather in the first 2 months of 1999 than we had for the same period in 1998 approaches a level greater than 95 percent. Perhaps more obviously, there is a 50 percent probability that we will see at least the 8 percent increase in winter (October-March) heating degree-days assumed for the base case forecast.