Example data analysis using Tableau Desktop. This analysis demonstrates the economy of scale gained by large utility's coal powered fleet in Maintenance Cost as a percentage of replacement asset value. This analysis also demonstrates the general groups of performance as indicated by the color of the bubbles. An important note is that small utilities perform very well (rivaling larger utilities). Data Source: SNL Energy FERC Forms

1. Northeast Utilities
PNM Resources, Inc.
Vectren Corporation
Sheet 12
Pinnacle West Capital Corporation
Portland General Electric Co.
Wisconsin Energy Corporation
Kansas City City of
Dominion Resources, Inc.
Salt River Project
JEA
AES Corporation
Entergy Corporation
Berkshire Hathaway Inc.
OUC
0K 2K 4K 6K 8K 10K 12K 14K 16K 18K 20K 22K 24K
Operating Capacity (MW)
2.8%
2.6%
2.4%
2.2%
2.0%
1.8%
1.6%
1.4%
1.2%
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
Avg. Maintenance % of RAV
Xcel Energy Inc.
UNS Energy Corporation
TECO Energy, Inc.
SCANA CorporOaGtioEn Energy Corp.
DTE Energy Company
Southern Company
Duke Energy Corporation
American Electric Power Company, Inc.
PPL Corporation
Dynegy Inc.
Net Generation (MWh)
1,445,137
50,000,000
100,000,000
153,334,653
Avg. Maintenance % of ..
0.4% 2.7%
Sum of Operating Capacity (MW) vs. average of Maintenance % of RAV. Color shows average of Maintenance % of RAV. Size shows sum of Net Generation
(MWh). The marks are labeled by Operator's Ultimate Parent. The data is filtered on Year, which keeps 2008. The view is filtered on Operator's Ultimate Parent,
which excludes 6 members.