xcel energy storage experience€¦ · xcel energy storage experience. innovative approaches and...

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

9

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

Thank you

Michelle Lim – Distribution EngineeringMichelle.M.Lim@xcelenergy.com

Questions?

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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200

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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

18

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