DOE Long Duration Energy Storage Workshop

March 9-10, 2021

“BIG” Energy Storage:
Priorities and Pathways to Long-Duration Energy Storage

Hosted by:

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  • This workshop defined the unique challenges of “BIG” (large capacity (>100 MWe) and long-duration (>6 hours) energy storage for grid applications, increased awareness in the energy storage community, and identified needs and gaps that must be addressed to realize the capability.
  • The workshop brought together researchers, representatives, and energy-storage stakeholders from utilities, industry (U.S. Domestic and International), U.S. Department of Energy, state and local government, national laboratories, and universities.
  • The outcome of this workshop is a summary of needs and gaps (scale and duration), use cases, potential technologies, and a framework for implementation through initiatives such as the U.S. DOE Energy Storage Grand Challenge.
  • NEW! Want to get primed for the workshop? Please read our Issue Brief on Long-Duration Storage.

Video Recordings

Video Recordings of the Workshop are Available! Workshop Registrants and Attendees should have received an email with links and passwords to access the recorded content, including participant lists and the active chat! If you were not able to register for the meeting please contact Erik Spoerke ( for access to workshop content.

Interested in virtual video tours of the technologies discussed in the workshop?

Click Here to access links to virtual tours.

Interested in highlighting your work with the long-duration storage community?

Click here to access our Community Table!

“BIG” Energy Storage Agenda

Tuesday, March 9: Defining the Long Duration Energy Storage Challenge

Welcome and Outline of WorkshopErik SpoerkeSandia National Laboratories
Keynote AddressDr. Imre GyukU.S. DOE, Director of Energy Storage Research, Office of Electricity

Panel 1: What is Long-Duration Energy Storage? Defining LDES Through Need (Moderator: Dr. Imre Gyuk)

Defining the Long Duration Energy Storage ChallengeMike GravelyCalifornia Energy Commission
Climate Leadership and Community Protection ActScott EgbertNew York State Energy Research and Development Authority (NYSERDA)
Need for Long Duration Energy Storage in New York StateKing LookCon Edison
State Drivers for Long Duration Energy StorageTodd Olinsky-PaulClean Energy Storage Alliance
 Ryan StephensShell
 David HowellDOE Vehicle Technologies Office

Panel 2: A Conversation about Policy (Moderator: Rebecca O’Neil, Program Manager, Pacific Northwest National Laboratory)

Erin ChildsStrategen
Rose AndersonOregon Public Utilities Commission
Debbie MurschGeneral Electric Renewable Energy
Vladimir KoritarovArgonne National Laboratory ​

Keynote Address

Duration Addition to electricitY Storage (DAYS)Scott LitzelmanU.S. DOE, Program Director, ARPA-E

Panel 3: Economics and Valuation of Long Duration Energy Storage (Moderator: Scott Litzelman)

Perspectives on Long Duration Electricity StoragePaul AlbertusUniversity of Maryland
Breakthrough, Low-Cost, Multi-Day Energy StorageMarco FerraraForm Energy
LDES Value: Concept and RealityMax TuttmanU.S. DOE, ARPA-E
 Paul DenholmNational Renewable Energy Laboratory
 Ali AmiraliStarwood Energy Group

Keynote Address

Use Cases and Applications for Long Duration Energy StorageKelly Speakes-BackmanU.S. DOE, Acting Assistant Secretary for the Office of Energy Efficiency and Renewable Energy

Panel 4: Long Duration Energy Storage Use Cases: Energy Storage Grand Challenge and Beyond (Moderator: Eric Hsieh, U.S. DOE, Office of Electricity and Technology Development Lead for the DOE Energy Storage Grand Challenge)

 Abbas AkhilFormer New Mexico State Representative
Small Islanded Electrical Systems Use CasesCarlos ReyesEcoEléctrica
IPP Renewal Project: Roadmap to Carbon Free GenerationKevin PengLos Angeles Department of Water and Power
Renewable Energy for a Sustainable FutureSander CohanEnel Green Power
Long-Duration Energy Storage – Utility PerspectiveDmitry KosterevBonneville Power Administration
 David Bianco
Imre Gyuk
National Grid, Nantucket Island

Wednesday, March 10: Emerging Technical Solutions for Long-Duration Energy Storage

Welcome and Outline of Day 2Erik SpoerkeSandia National Laboratories
Keynote RemarksMichael PesinU.S. DOE, Deputy Assistant Secretary for Advanced Grid Research and Development

Panel 5: Thermal Storage (Moderator: Clifford Ho, Sandia National Laboratories)

Molten-Salt Thermal StorageBruce KellySolarDynamics
Rock-Bed Thermal StorageMaxwell Cameron-JonesSiemens-Gamesa
Moving Particle Packed Bed Thermal StorageZhiwen MaNational Renewable Energy Laboratory
Pumped Thermal StorageBen BollingerMalta
Molten Alloy Latent Heat StorageTorbjörn LindquistAzelio
Liquid Air Latent Heat StorageRichard RileyHighview
Virtual Tours of Technologies/Systems I

Panel 6: Mechanical and Gravity Storage (Moderator: Michael Starke, Oak Ridge National Laboratory)

Stacked Block Energy StorageAndrea PedrettiEnergy Vault
Advanced Rail Energy StorageRuss WeedARES
Pumped Hydro StorageJeremy GoodmanTennessee Valley Authority
Advanced Pumped HydroDavid HavardGE Renewable Energy
Subsurface Pumped StorageJoe ZhouQuidnet
Virtual Tours of Technologies/Systems II

Panel 7: Chemical, Hydrogen, and Fuels Storage (Moderator: Chris San Marchi, Sandia National Laboratories)

Technical Gaps in Hydrogen StorageNeha RustagiDOE Hydrogen and Fuel Cell Technologies Office
Solar FuelsChristian SattlerGerman Aerospace Center
Liquid Organic Hydrogen CarriersThomas AutreyPacific Northwest National Laboratory
Hydrogen StorageRon KentSoCalGas
Hydrogen StorageNoah MeeksSouthern Company Services
Geologic StorageAnna Snider LordSandia National Laboratories
Virtual Tours of Technologies/Systems III

Panel 8: Battery Storage (Moderator: Vince Sprenkle, Pacific Northwest National Laboratory)

Sodium-Sulfur BatteriesTomio TamakoshiNGK
Vanadium Redox Flow BatteriesGary YangUniEnergy Technologies
Aqueous Redox Flow BatteriesRichard BrodyLockheed Martin
Liquid Metal BatteriesDavid BradwellAmbri
Zn-based BatteriesSanjoy BanerjeeUrban Electric Power
Li-Ion BatteriesC. Michael HoffHoffpower
Summary and Closing RemarksErik SpoerkeSandia National Laboratories