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Xcel Energy Storage ExperienceInnovative Approaches and Lessons Learned
July 24th 2019Michigan Energy Providers Conference
Xcel EnergyServing eight states• 3.6 million electricity customers• 2 million natural gas customers
Nationally recognized leader:• Wind energy• Energy efficiency• Carbon emissions reductions• Innovative technology• Storm restoration
Leading the Clean Energy TransitionA bold vision for a carbon-free future
2018 2030 2050
38%Reduction
80%Reduction
100%Carbon Free
Why Energy Storage?Energy storage can be deployed in all parts of the grid, and
has applications in all parts of the value chain.
Source: Adapted from DOE/EPRI Handbook, EEI (graphic)
Enhance Utility Operations
• Alleviate high energy prices through time shifts
• Reduce the need for new generation
Provide Grid Support
• Regulate frequency• Reduce spinning, non-spinning and
supplemental reserve requirements• Voltage support• Black start electricity restoration
• Defer transmission & distribution upgrades
• Relieve electricity congestion
• Higher power quality and reliability
• Retail electric energy time shift
Enhance Customer Experience
FERC REGULATED STATE REGULATED T&D
END USE
Optimize Power System
Experience with Energy Storage
Storage Project Timeline
Luverne, MN Wind to Battery Project• 1 MW/ 7.2 MWh • Sodium Sulfur (NaS, molten salt)
1967
2009
Solar-to-Battery• 1 MW, 1.5 MWh • Advanced Lead Acid
Community Energy Storage• 25 kW, 50 kWh• Sodium Nickel Chloride
2011
2015
2017
2018
Panasonic Microgrid• 1 MW, 2 MWh • Li – ion• Grid services, Microgrid
Stapleton Behind-the-Meter• 6 x 6 kW/15 kWh• Paired w/ solar• Back-up power
Stapleton Utility-Sited• 6 x 18-54 kW/4 hour• Renewable integration• Grid services
Cabin Creek Generating Station• 324 MW, 4 hour• Pumped hydro• Peak Management, Renewable Energy
Integration, Spinning Reserve
Panasonic – Peña Station Microgrid Pilot• 1 MW, 2 MWh Lithium-Ion Aggreko (previously Younicos) Battery• 1.2 MW carport solar PV system, 200 kW customer-sited rooftop PV system• Islanding switch and BESS owned by Xcel Energy• Use Cases: Microgrid/Resiliency, Voltage Regulation, Peak Demand Reduction, Solar Ramp Rate
Control, Energy Arbitrage, Frequency Response• Microgrid capabilities: During a grid outage, Panasonic can island from the grid – battery powers
facility, rooftop PV system is also able to operate• Public-Private Partnership: Xcel Energy, Panasonic, City of Denver, Denver International Airport
Innovative Clean Technologies Projects
Community Energy Storage - Stapleton6 utility-sited Northern-Reliability batteries, 6 behind-the-meter residential batteries (Sunverge)Located in Stapleton neighborhood in Denver, CO with ~20% PV PenetrationUse Cases: Solar Time Shifting, Voltage Regulation, Peak Demand Reduction, Energy Arbitrage,
Residential Back-up Power, Volt-Watt OperationTesting of customer and utility-sited batteries to understand future impacts and capabilities for
renewables integration
Innovative Clean Technologies Projects
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Key lessons learned so far• Value of demonstrations:
– Understand the value, costs, and benefits of an installation– Informs specifications, communications, cybersecurity,
interoperability standards, interconnection, etc.• Implementation and Integration:
– Different vendor platforms Need for interoperability between devices and systems
– Communications protocols• Inform Future Deployment:
– Mitigating feeder issues related to high PV– Residential battery as DR resource – Non-wires alternatives
Future Opportunities
Colorado Energy Plan Portfolio• Colorado Energy Plan: 1,100
MW Wind, 700 MW Solar
• 275 MW of battery additions, paired with solar
• Adams County: 110 MW solar + 50 MW storage
• Pueblo: 525 MW solar + 225 MW storage
• All-source Energy Request for Proposal brought in 133 total energy storage bids from 97 separate projects
Upper Midwest Clean Energy Vision
History of Energy Storage at Xcel Energy
1967 – Cabin Creek Pumped Hydro• 324 MW, 4 hour• Peak Management• Renewable Energy Integration• Spinning Reserve• 2019 refurbishment and uprate
to 360 MW
2009 – MinnWindLuverne Battery• 1 MW, 7-hour sodium-sulfur
battery, paired with 11 MW wind project
• Funded through RDF grant • Testing for energy time-shift, wind
integration, and regulation services
2011 – SolarTAC• Community Energy Storage
Project: Testing solar integration with 25-kW battery
• Solar2Battery project: Evaluating storage for grid support with 1.5 MW battery + 800 kW solar array
Residential Battery Demand Response Pilot (DSM)
• Customer buys or leases battery
• Xcel Energy provides $500 upfront + $10/mo. Rebate
• Up to 500 customers
• 2 year pilot, includes early termination clause if customer takes credit and leaves pilot
Customer Details
Company Details
• Manages 50% of battery for up to 100 events
• Integrates vendors into DRMS
• Year-round DR: summer peak reduction, spring solar time shifting, fall/winter renewable integration
• Filed at end of August in the 2019/2020 DSM Plan
Objectives
• Integrate batteries into utility systems
• Test battery availability and performance
• Evaluate customer preferences
Residential batteriesInterconnection Guidelines
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Minnesota Colorado
Customer Installations
In InterconnectionProcess
Installed
Panasonic Testing Results Summary
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Operation Performance Potential Impact on Grid
Voltage Regulation Good Extensive
Peak Demand Reduction Good Moderate
Energy Arbitrage Good Minimal
PV Ramp Rate Limiting Good Minimal
Frequency Response Good Moderate
Microgrid Good Extensive
Detailed results can be found in the 2019 Annual Report to the Colorado Public Utilities Commission Regarding the Innovative Clean Technology Program
Stapleton BTM Testing Results
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Operation Performance Impact on Grid
Solar Time Shifting Good Moderate
Peak Demand Reduction Good Moderate
Solar Ramping Good Moderate
Customer Backup OK Extensive
Detailed results can be found in the 2019 Annual Report to the Colorado Public Utilities Commission Regarding the Innovative Clean Technology Program
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Operation Performance Impact on Grid
Solar Time Shifting Good Moderate
System Peak DemandReduction Good Moderate
Feeder PeakDemand Reduction Good Moderate
Voltage RegulationIn various stages of testing
Energy Arbitrage
Detailed results can be found in the 2019 Annual Report to the Colorado Public Utilities Commission Regarding the Innovative Clean Technology Program
Stapleton Utility-Sited Testing Results