large-scale renewable energy: the top challenges dick kelly chairman, president and ceo epri 2008...
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Xcel Energy Wind and Solar Resources Xcel Energy States Served Wind Density High Low Source: National Renewable Energy Laboratory Source: NREL, 2004TRANSCRIPT
Large-Scale Renewable Energy: The Top Challenges
Dick KellyChairman, President and CEO
EPRI 2008 Summer SessionAugust 4, 2008
Northern States Northern States Power Company- Power Company-
MinnesotaMinnesota
Public Service Public Service Company of Company of
ColoradoColorado
Southwestern Southwestern Public ServicePublic Service
Northern States Northern States Power Company- Power Company-
WisconsinWisconsin
Xcel EnergyElectric Customers 3.3 millionGas Customers 1.8 million
Xcel Energy Wind and Solar Resources
Xcel EnergyXcel EnergyStates ServedStates ServedWind DensityWind Density
HighHigh
LowLow
Source: National Renewable Energy LaboratorySource: National Renewable Energy Laboratory Source: NREL, 2004Source: NREL, 2004
Xcel Energy Renewable Energy Portfolio
No. 1 wind provider in the nation
No. 5 for solar energy
7,400 MW7,400 MW
2020202020072007
2,700 MW2,700 MW
Challenges of Wind Energy
Forecasting
Intermittency
Integration
Cost
Challenge No. 1: Wind Forecasting
Critical information not available Site wind
characteristics
Turbine availability
Site topography
Challenge No. 2: Intermittency
0
200
400
600
800
1,000
1,200
1:002:0
03:0
04:0
05:0
06:0
07:0
08:0
09:0
010
:0011
:0012
:0013
:0014
:0015
:0016
:0017
:0018
:0019
:0020
:0021
:0022
:0022
:0023
:00
Total PSCo Wind GenerationMW
Time of Day
Intermittency Solutions
More transmission
Large-scale storage
A smarter grid
Challenge No. 3:Impact on Conventional Supply
Base-load plants cycle faster and more often
Higher maintenance costs
Challenge No. 4: Cost
Production tax credit for wind
Solar investment tax credit
More certainty