Xcel Energy 2012 Annual Report Download - page 29

19
Energy Source Statistics
Year Ended Dec. 31
2012 2011 2010
Millions of
KWh
Percent of
Generation
Millions of
KWh
Percent of
Generation
Millions of
KWh
Percent of
Generation
Coal ............................. 21,367
59
% 22,065
61
% 22,767
61
%
Natural Gas ...................... 7,930 22 8,896 24 9,854 27
Wind (a) ..........................
5,752 16 4,518 12 3,830 10
Hydroelectric ....................
590 2 681 2 446 1
Other (b)..........................
263 1 324 1 257 1
Total ..........................
35,902
100
% 36,484
100
% 37,154
100
%
Owned generation ................ 23,766
66
% 23,743
65
% 24,444
66
%
Purchased generation ............. 12,136 34 12,741 35 12,710 34
Total ..........................
35,902
100
% 36,484
100
% 37,154
100
%
(a) This category includes wind energy de-bundled from RECs and also includes Windsource RECs. PSCo uses RECs to meet or exceed state resource
requirements and may sell surplus RECs.
(b) Includes energy from other sources, including nuclear, solar, biomass, oil and refuse. Distributed generation from the Solar*Rewards program is not
included.
Fuel Supply and Costs
The following table shows the delivered cost per MMBtu of each significant category of fuel consumed for owned electric
generation, the percentage of total fuel requirements represented by each category of fuel and the total weighted average cost of
all fuels.
Coal Natural Gas
Weighted
Average Owned
PSCo Generating Plants Cost Percent Cost Percent Fuel Cost
2012...............................
$
1.77
78
% $ 4.25
22
% $ 2.31
2011............................... 1.77 76 4.98 24 2.54
2010............................... 1.58 85 5.05 15 2.11
See Items 1A and 7 for further discussion of fuel supply and costs.
Fuel Sources
Coal — PSCo normally maintains approximately 41 days of coal inventory. Coal supply inventories at Dec. 31, 2012 and 2011
were approximately 46 and 48 days usage, respectively. PSCo’s generation stations use low-sulfur western coal purchased
primarily under contracts with suppliers operating in Colorado and Wyoming. During 2012 and 2011, PSCo’s coal requirements
for existing plants were approximately 11.3 and 10.5 million tons, respectively. The estimated coal requirements for 2013 are
approximately 11.4 million tons.
PSCo has contracted for coal supply to provide 97 percent of its coal requirements in 2013, and a declining percentage of
requirements in subsequent years. PSCo’s general coal purchasing objective is to contract for approximately 100 percent of
requirements for the following year, 67 percent of requirements in two years, and 33 percent of requirements in three years.
Remaining requirements will be filled through the procurement process or over-the-counter transactions.
PSCo has coal transportation contracts that provide for delivery of 100 and 46 percent of its coal requirements in 2013 and 2014,
respectively. Coal delivery may be subject to short-term interruptions or reductions due to operation of the mines, transportation
problems, weather and availability of equipment.