1. Reducing Carbon
Delivering Results
West Coast Investor Meetings
August 18-20, 2008

2. Safe Harbor
This material includes forward-looking statements that are subject to
certain risks, uncertainties and assumptions. Such forward-looking
statements include projected earnings, cash flows, capital
expenditures and other statements and are identified in this document
by the words “anticipate,” “estimate,” “expect,” “projected,”
“objective,” “outlook,” “possible,” “potential” and similar
expressions. Actual results may vary materially. Factors that could
cause actual results to differ materially include, but are not limited to:
general economic conditions, including the availability of credit,
actions of rating agencies and their impact on capital expenditures;
business conditions in the energy industry; competitive factors;
unusual weather; effects of geopolitical events, including war and acts
of terrorism; changes in federal or state legislation; regulation; actions
of accounting regulatory bodies; and other risk factors listed from
time to time by Xcel Energy in reports filed with the SEC, including
Exhibit 99.01 to Xcel Energy’s report on Form 10-K for year 2007.

3. Attractive Investment Opportunity
Environmental leader with both a willingness and
the ability to address environmental challenges
Constructive regulation with enhanced recovery
of major capital projects
Rate base growth opportunities
Track record of successful execution
Strong corporate governance

4. Environmental Leader
Resource plans’ projected CO2 emission reductions
Minnesota plan: 22% reduction by 2020
Colorado plan: 10% reduction by 2017
Innovative technology
Smart Grid
Solar
Wind to battery
Wind to hydrogen
Demand Side Management
Geographic advantages
Wind
Solar
Biomass
Carbon sequestration

5. Geographic Competitive Advantage
Biomass Resource
Wind Resource
Source: National Renewable Energy Laboratory
Solar Resource
Wind Density
High
Low
Xcel Energy
States Served

6. Reducing Carbon Dioxide Emissions*
Millions of tons
80
75
70
65
60
2003 2004 2005 2006 2007
* Owned–generation carbon dioxide emissions

7. Projected Renewable Resources
Energy
2007 2020
Nuclear Nuclear
11% 13% Renewables
Natural
Renewables 24%
Gas
9%
31%
Natural Gas
17%
Coal Coal
49% 46%
Capacity
Wind Hydro Solar Biomass RDF Landfill Geothermal
MW
2007 2,700 365 17 182 100 15 0
2020 7,400 400 600 250 60 20 20

8. Smart Grid Pilot Project
Pilot project in Boulder, Colorado:
Five major partners
Total project cost ~ $100 million
Xcel Energy portion ~ $15 million
Build out completed in 2009
Scope:
Smart meters
Real time, high speed, two–way communications
Intelligent home/smart appliances
Demand Side Management
Distributed generation
Renewable energy sector growth
Energy storage devices

9. Constructive Regulation
Transmission riders – CO, MN, ND, SD
Renewable riders – CO, MN
MERP rider – MN
Conservation/DSM riders – CO, MN
Environmental riders – MN, ND, SD
Capacity rider – CO
Comanche 3 forward CWIP via general rate case – CO
IGCC rider – CO
Air quality improvement rider – CO

10. Projected Rider Revenue
Dollars in millions
240
Metro Emissions Reduction Project (MN)
Air Quality Improvement Rider (CO) $195
200
Renewable Energy Standard (MN)
$166
Transmission Rider (CO)
160 Transmission Rider (MN)
120 $107
$73
80
40
0
2006 2007 2008 2009

11. Regulatory Results
Rate relief granted 2006-2007: $400 million
2006 Minnesota electric rate case: $131 million
2006 Colorado electric rate case: $151 million
2006 Wisconsin gas and electric rate cases: $47 million
2007 Colorado gas rate case: $32 million
Other: $39 million

12. Pending Rate Cases
Requested Status
New Mexico Electric March 2008 Pending
$16.6 million Fall 2008
10.7% ROE
North Dakota Electric June 2008 Pending
$17.9 million Fall 2008
10.75% ROE Interim rates
SPS Wholesale March 2008 Pending
$14.9 million Fall 2008
12.2% ROE
Texas Electric June 2008 Pending
$61.3 million overall Qtr 1 2009
11.25% ROE
NSP-Wisconsin August 2008 Pending
Limited Reopener Qtr 4 2008
$47.1 million

13. Recovery on Capital Expenditures*
Dollars in millions
2,800
$2,350
2,400
$2,150
$2,000
$1,900
2,000
1,600
1,200
800
400
0
2008 2009 2010 2011
Traditional Recovery Enhanced Recovery Depreciation
* Capital expenditure forecast based on middle of range

14. Delivering on Rate Base Growth*
Dollars in billions
CAGR = 7.3%
$16.6
$15.4
$14.5
$13.7
$12.5
2007A 2008F 2009F 2010F 2011F
* Growth based on middle of capital forecast range

15. Proven Track Record
Delivering on 5 – 7% EPS Growth
Guidance Range
$1.45 – $1.55
$1.43
$1.30
$1.15
~5%**
10%
13%
2005 2006 2007 2008
Ongoing* Ongoing* Ongoing* Guidance
* Ongoing EPS excludes the impacts of COLI and disc ops.
A reconciliation to GAAP earnings is included in the appendix.
** Estimated growth rate based on middle of guidance range

16. Proven Track Record
Delivering 2 – 4% Dividend Growth*
Annualized dividend per share
2004 – 2008 CAGR = 3.4%
$0.95
$0.92
$0.89
$0.86
$0.83
$0.75
2003 2004 2005 2006 2007 2008
* Xcel Energy increased the dividend by 3¢ on May 21, 2008

17. Strong Corporate Governance
Independent Lead Director
Annual election of all directors
12 independent directors on 13 person board
Management compensation aligned with
shareholders – stock ownership guidelines:
CEO ownership 5x annual base salary
CFO/Other Officers ownership 3x base salary

18. Value Proposition
Low risk, fully regulated and integrated utility
Constructive regulation with enhanced recovery
of major capital projects
Pipeline of investment opportunities
Environmental leader, well–positioned
for changing rules
Attractive Total Return
Sustainable annual EPS growth of 5% – 7%
with upside potential
Strong dividend yield of ~ 4.6%
Sustainable annual dividend growth of 2% – 4%

19. Appendix

20. Company Profile
Traditional Regulation
NSP-Wisconsin
Operate in 8 States
NSP-Minnesota 6% of earnings *
40% of earnings *
Combination Utility
Electric 85% of net income
Gas 15% of net income
PSCo
49% of earnings * Customers
3.3 million electric
1.8 million gas
SPS 2007 Financial Statistics
5% of earnings * NI Ongoing: $612 million
NI GAAP: $577 million
* Percentages based on 2007 Ongoing Earnings
Assets: $23 billion
Equity ratio: 43%
2007 EPS Ongoing: $1.43; GAAP: $1.35
2008 Dividend $0.95 per share annualized

21. Reconciliation –
Ongoing EPS to GAAP
Dollars per share
2007
2005 2006
Ongoing Earnings $1.15 $1.30 $1.43
PSRI/COLI 0.05 0.05 (0.08)
Continuing Operations $1.20 $1.35 $1.35
Disc Ops 0.03 0.01 –
GAAP Earnings $1.23 $1.36 $1.35
As a result of the termination of the COLI program, Xcel Energy’s management
Energy’s
believes that ongoing earnings provide a more meaningful comparison of earnings
comparison
results between different periods in which the COLI program was in place and is
more representative of Xcel Energy’s fundamental core earnings power.
Energy’s
Xcel Energy’s management uses ongoing earnings internally for financial planning
Energy’s planning
and analysis, for reporting of results to the Board of Directors, in determining
Directors,
whether performance targets are met for performance-based compensation,
performance-based
and when communicating its earnings outlook to analysts and investors.
investors.

22. Earnings Guidance Range
Dollars per share
2007A 2008
Regulated Utility $1.55 $1.61 – $1.71
Holding Company (0.12) (0.16)
Ongoing Earnings $1.43 $1.45 – $1.55
PSRI/COLI $(0.08) –
Continuing Operations 1.35 1.45 – 1.55
Disc Ops – –
GAAP Earnings $1.35 $1.45 – $1.55

23. Capital Expenditure Forecast
Denotes enhanced recovery mechanism
Dollars in millions
2008 2009 2010 2011
Base & Other $1,245 $1,285 $1,310 $1,300
MERP 170 25 10 0
Comanche 3 330 60 10 0
MN Wind Tran/CapX 2020 40 65 115 270
Sherco Upgrade 5 20 75 230
MN Wind Generation 135 0 0 0
Nuclear Capacity/Life Ext 75 120 180 200
Fort St. Vrain CT 100 25 0 0
Total Committed $2,100 $1,600 $1,700 $2,000
Potential Projects 0-100 200-400 200-400 200-500
Range $2,100- $1,800- $1,900- $2,200-
$2,200 $2,000 $2,100 $2,500

24. Capital Expenditures
by Operating Company*
Dollars in millions
2008 2009 2010 2011
NSPM $935 $955 $1,060 $1,380
PSCo 945 650 680 750
SPS 170 205 180 140
NSPW 100 90 80 80
Total $2,150 $1,900 $2,000 $2,350
* Capital forecast based on middle of range

25. Capital Expenditures by Function*
Dollars in millions
2008 2009 2010 2011
Elec Generation $935 $480 $525 $745
Elec Transmission 300 325 390 500
Elec Distribution 355 345 355 360
Gas 140 155 160 155
Nuclear Fuel 145 150 140 105
Common/Other 225 145 130 135
Potential Projects 50 300 300 350
Total $2,150 $1,900 $2,000 $2,350
* Capital forecast based on middle of range

26. Credit Ratings
Secured Unsecured
Fitch Moody’s S&P Fitch Moody’s S&P
Holding Co. – – – BBB+ Baa1 BBB
NSPM A+ A2 A A A3 BBB
NSPW A+ A2 A A A3 BBB+
PSCo A A3 A A– Baa1 BBB
A–
SPS – – – BBB+ Baa1 BBB+

27. Debt Maturities
Dollars in millions
$1,200
SPS
$1,000 PSCo
NSPW
$800
NSPM
$600 Xcel Energy
$400
$200
$0
2008 2009 2010 2011 2012 2013 2014 2015

28. Strong Access to Credit Markets in 2008
Hold Co - issued $400 million of retail hybrid securities
with a 7.6% coupon in January
NSP-Minnesota - issued $500 million of first mortgage bonds
with 10 year maturity and 5.25% coupon in March
PSCo - issued $600 million of first mortgage bonds in August:
10 year tranche with a 5.8% coupon
30 year tranche with a 6.5% coupon
Potential debt issuances: 2nd half 2008
NSP–Wisconsin: Up to $250 million of first mortgage bonds
SPS: Up to $250 million of unsecured debt