Exhibit
99(a)
 Examples
of Wholesale Energy, Fuel and Emission Allowance Price Fluctuations
 2004
through 2008
 
 Wholesale
Energy:
 PJM
West Hub* Power Price - $/MWh
 Year
                      High
                      Month
                      Low
                      Month2004
                      $
                      181.66
                      
                      December
                      $
                      0.00
                      **
                      Jan.,
      June, July,
                        Aug.,
      Sept., Oct.2005
                      $
                      315.65
                      
                      July
                      $
                      0.00
                      **
                      Jan.,
      April, May,
                        June,
      July, Sept.2006
                      $
                      769.90
                      
                      August
                      $
                      0.00
                      **
                      April,
      May, June, July,
                        Aug.,
      Nov., Dec.2007
                      $
                      571.60
                      
                      August
                      $
                      0.00
                      **
                      May,
      June,
                        July,
      Sept.2008
                      $
                      475.58
                      
                      June
                      $
                      0.00
                      **
                      May,
      July,
                        Aug.,
      Sept.
 *      A
common trading hub for PJM.
 **    Occurs
during times of low demand for electricity when generation levels of generating
units are reduced to their normal minimums.
 
 Mid-C*
Power Price - $/MWh
 Year
              High
              Month
              Low
              Month2004
              $
              65.06
              
              July
              $
              10.21
              
              June2005
              $
              139.76
              
              December
              $
              7.68
              
              May2006
              $
              189.87
              
              July
              $
              (2.00)
              **
              May2007
              $
              197.79
              
              July
              $
              0.86
              
              March2008
              $
              101.29
              
              April
              $
              (7.50)
              **
              June
 *      A
common trading hub for Northwestern U.S.
 **    Occurs
when generation levels from hydroelectric units exceed demand due to excess
water runoff.
  Fuel:
 NYMEX
Coal (1% sulfur content, 12,000 Btu) Price - $/ton
 Year
              High
              Month
              Low
              Month2004
              $
              63.00
              
              August
              $
              39.67
              
              January2005
              $
              62.75
              
              September
              $
              51.10
              
              June2006
              $
              57.75
              
              February
              $
              37.50
              
              November2007
              $
              56.80
              
              November
              $
              38.75
              
              January2008
              $
              143.25
              
              July
              $
              56.17
              
              January
 
 NYMEX
Natural Gas Price - $/million Btu
 Year
              High
              Month
              Low
              Month2004
              $
              8.73
              
              November
              $
              4.57
              
              September2005
              $
              15.38
              
              December
              $
              5.83
              
              January2006
              $
              10.63
              
              January
              $
              4.20
              
              September2007
              $
              9.90
              
              May
              $
              5.20
              
              September2008
              $
              13.69
              
              August
              $
              5.28
              
              December
 
 Residual
Oil (1% sulfur content) Price @ NY Harbor - $/barrel
 Year
              High
              Month
              Low
              Month2004
              $
              35.38
              
              October
              $
              22.12
              
              December2005
              $
              54.38
              
              October
              $
              26.88
              
              January2006
              $
              54.25
              
              April
              $
              35.00
              
              October2007
              $
              72.52
              
              December
              $
              37.23
              
              January2008
              $
              119.70
              
              July
              $
              28.40
              
              December
 
 Sulfur
Dioxide Emission Allowances:
 SO2
Emission Allowance Price - $/allowance
 Year
              High
              Month
              Low
              Month2004
              $
              730
              
              November
              $
              210
              
              January2005
              $
              1,610
              
              December
              $
              640
              
              January2006
              $
              1,598
              
              January
              $
              445
              
              November2007
              $
              715
              
              June
              $
              405
              
              January2008
              $
              535
              
              January
              $
              88
              
              July