Every technology tracked, from class to segment: the leading companies, the projects deploying it, the minerals it depends on, and funding open right now.
LOADING…
Projects tracked
16
4 operating · 2 in construction
Capital committed
$954M
closed or awarded, project level
Companies tracked
19
ranked on this page
Operating capacity
53 MW
4 plants · 1,256 MW planned
Next milestone
~Mid-2027
Online (target)
Coming up
PROJECT · CAMBRIDGE ENERGY STORAGE PROJECTOnline (target)
Form Energy · Cambridge, MN
technologyreview.com →+ THESISPROJECT · COLUMBIA ENERGY STORAGE PROJECTConstruction complete (target)
Energy Dome · Town of Pacific, Columbia County, WI
alliantenergy.com →+ THESISPROJECT · COPPER CROSSING IRON FLOW BATTERYDelivery (target)
ESS Tech · Copper Crossing Energy and Research Center, Florence, AZ
publicpower.org →+ THESISEnergy-Storage.news: In recent North American sodium-ion news, Hithium is entering the Canadian market with two BESS solutions, while Peak Energy has closed a Series B financing round led by GM.
energy-storage.news →+ THESISEnergy-Storage.news: Rondo Energy and Rio Tinto have started engineering and design work on a 360MWh thermal energy storage (TES) project in Australia.
energy-storage.news →+ THESISEnergy-Storage.news: Zinc hybrid cathode battery and storage system maker Eos Energy Enterprises has reported its highest quarterly revenue to date alongside a narrowing gross margin loss.
energy-storage.news →+ THESISPROJECTRondo Energy: Rondo and Rio Tinto begin FEED on 360 MWh Yarwun heat battery
Rondo and Rio Tinto started front-end engineering and design for a 360 MWh storage / 30 MW discharge heat battery at Rio Tinto's Yarwun alumina refinery near Gladstone, Queensland. ARENA funding is staged: an initial A$3.6M for FEED, then up to A$38M for deployment, plus up to A$33.3M in conditional contingency support.
prnewswire.com →+ THESISOTHEREos Energy: Eos gives preliminary Q3 2026 revenue of $82–83M
Preliminary Q3 2026 revenue of $82M to $83M, with a backlog of about $765M and total cash of about $344M as of September 30, 2026. Final results are scheduled for November 5, 2026.
sec.gov →+ THESISFUNDING · PRATT ENERGY THERMAL BATTERYEquity: Copenhagen Infrastructure Partners (lead); Grok Ventures; University Pension Plan Ontario
Closed · Third-party project equity; amount not disclosed
ess-news.com →+ THESISPROJECT · PRATT ENERGY THERMAL BATTERYAntora and Pratt Energy announce the 5.8 GWh project with CIP-led equity
Antora Energy · Pratt Energy biorefinery, Pratt, KS
ess-news.com →+ THESISPROJECTHydrostor: Greater Napanee council backs Hydrostor project changes ahead of IESO bid
After a Sept. 22, 2026 deputation by Hydrostor, Greater Napanee council agreed to project enhancements; the company said raising capacity to 650 MW would make its IESO bid more competitive. Municipal support had been granted in May.
kingstonist.com →+ THESISFUNDINGForm Energy: Form Energy closes $270M credit facility for Weirton manufacturing
The facility supports manufacturing expansion and working capital at Form Factory 1 in Weirton, WV. It follows the $750M Series G, which took total equity raised above $2 billion.
citybiz.co →+ THESISFUNDINGEos Energy: Eos receives $87M advance under DOE loan for Thorn Hill
Eos received an $87 million advance under its U.S. Department of Energy loan to fund a second production line at its Thorn Hill facility.
eose.com →+ THESISIron-air, thermal (heat) batteries and compressed-air storage for 10+ hours to multiple days.
Somerville, MA, USA · 100-hour iron-air batteries; factory in Weirton, WV
DEMONSTRATION
> $2B equity (incl. $750M Series G)
Form Factory 1Cambridge Energy Storage P…Sherco iron-air batteryGeorgia Power iron-airXcel–Google Minnesota stor…Comanche iron-air batteryMendocino iron-air battery
Updated 9 months ago · Xcel–Google Minnesota storage: Google and Xcel announce 300 MW / 30 GWh of Form batteries in a 1.9 GW clean energy deal
California, USA · Thermal batteries (heated carbon blocks) for industrial heat and power
FIRST COMMERCIAL
$550M Series C (total not stated)?
POET Big Stone thermal bat…Pratt Energy thermal battery
Updated 39 days ago · Pratt Energy thermal battery: Antora and Pratt Energy announce the 5.8 GWh project with CIP-led equity
Toronto, Canada · Advanced compressed-air storage in underground caverns
DEMONSTRATION
$230M equity round (total not stated)?
Updated 4 months ago · Willow Rock Energy Storage Center: Groundbreaking (planned mid-2026)
Alameda, CA, USA · Thermal (heated brick) batteries for industrial heat
FIRST COMMERCIAL
Not yet sourced?
Updated 13 months ago · Holmes Western heat battery: Commercial operation: 100 MWh heat battery charged by onsite solar
Edison, NJ, USA · Zinc-based batteries for 3–12 hour storage
FIRST COMMERCIAL
Not yet sourced?
Updated 24 months ago · Project AMAZE (Turtle Creek lines): $303.5M DOE loan closed
Wilsonville, OR, USA · Iron flow batteries
Commercial (iron flow)?
Updated 13 months ago · Copper Crossing iron flow battery: SRP and ESS announce the 50 MWh pilot
Westlake Village, CA, USA · Gravity storage plus battery and hydrogen storage projects
Commercial
No dated updates yet
Cambridge, MA, USA · Pumped-heat (molten salt) electricity storage
Development (thermal)?
No dated updates yet
Houston, TX, USA · Geomechanical pumped storage (water pressurized underground)
Demonstration (geomechanical)
No dated updates yet
Palo Alto, CA, USA · Carbon-oxygen reversible solid-oxide storage for 100+ hours
Demonstration
No dated updates yet
Fremont, CA, USA · Nickel-hydrogen batteries
Commercial (nickel-hydrogen)
No dated updates yet
Woburn, MA, USA · Non-flammable sodium-based batteries
Early commercial
No dated updates yet
Medford, MA, USA · Joule Hive firebrick thermal storage for industrial heat
Demonstration (thermal)
No dated updates yet
Bedford, MA, USA · High-temperature thermal storage in liquid tin with thermophotovoltaic conversion
Demonstration (thermal)
No dated updates yet
Miami, FL, USA · Solar heat collected and stored in modules for data-center power
Early commercial (thermal)
No dated updates yet
Champaign, IL, USA · Low-cost thermochemical heat storage pellets
Early commercial (thermal)
No dated updates yet
Salt Lake City, UT, USA · Flywheel plus battery hybrid storage
Commercial (flywheel + battery)
No dated updates yet
Marlborough, MA, USA · Liquid-metal (calcium-antimony) batteries; relaunched after 2024 Chapter 11
?
No dated updates yet
USA · Sodium-ion grid batteries with passive cooling
Early commercial (sodium-ion)?
No dated updates yet
The open problems between long-duration storage and large-scale deployment.UNSOLVED · 1IN PROGRESS · 3
Market rules and revenueUNSOLVED
Few power markets pay for energy that can be held for days; capacity accreditation often values a 100-hour battery little more than a 4-hour one.
Where it standsUtilities are signing bilateral deals instead (Great River, Georgia Power, Xcel for Google), and some states have LDES procurement targets. Market redesign is slow.
Cost per kWh against lithium-ionIN PROGRESS
Multi-day storage only makes sense if each stored kWh is far cheaper than four-hour lithium-ion, whose prices keep falling.
Where it standsIron-air (Form), zinc (Eos), thermal bricks (Rondo, Antora) and compressed air (Hydrostor) all target much lower cost per kWh, but most are at first-factory or first-plant scale.
Form EnergyEos EnergyAntora EnergyRondo EnergyHydrostorsandia.gov
Manufacturing scale-upIN PROGRESS
Costs only fall with volume, and new chemistries need new factories.
Where it standsForm's Weirton factory runs about 2 GWh a year toward a backlog near 80 GWh; Eos is building four automated lines with a DOE-backed loan.
Financing a new technologyIN PROGRESS
Lenders want years of operating data before offering cheap debt.
Where it standsDOE loan support (Hydrostor's $1.76B conditional commitment, now under review; Eos's closed loan) and utility-owned pilots are filling the gap.
Sage Geosystems · Christine, Atascosa County, TX
OPERATING · 3 MW · 18 MWh
Hydrostor · Rosamond, Kern County, CA
PERMITTED · 500 MW · 4 GWh
Form Energy · Cambridge, MN
CONSTRUCTION · 1.5 MW · 150 MWh
Form Energy · Georgia
DEVELOPMENT · 15 MW · 1.5 GWh
Form Energy · Minnesota
DEVELOPMENT · 300 MW · 30 GWh
Form Energy · Weirton, WV
OPERATING
Eos Energy · Turtle Creek, PA
CONSTRUCTION
Rondo Energy · Kern County, CA
OPERATING · 100 MWh
Antora Energy · Big Stone City, SD
OPERATING · 50 MW · 5 GWh
Energy Dome · Town of Pacific, Columbia County, WI
PERMITTED · 20 MW · 200 MWh
Form Energy · Sherburne County Generating Station, Becker, MN
PERMITTED · 10 MW · 1 GWh
Form Energy · Comanche Generating Station, Pueblo, CO
DEVELOPMENT · 10 MW · 1 GWh
Form Energy · PG&E substation, East Road, Redwood Valley, Mendocino County, CA
DEVELOPMENT · 1.5 MW · 150 MWh
ESS Tech · Copper Crossing Energy and Research Center, Florence, AZ
DEVELOPMENT · 5 MW · 50 MWh
Antora Energy · Pratt Energy biorefinery, Pratt, KS
DEVELOPMENT · 5.8 GWh
Rye Development · Northeast of Klamath Falls, Klamath County, OR
PERMITTED · 393 MW
What long-duration storage depends on, what each input does in this technology, and how exposed it is (red high, blue medium, green low). Prices are 2025 averages (USGS); live prices arrive with Markets.
The electrolyte in vanadium flow batteries; the vanadium is the energy store.
Largest producer: China
Used in liquid-metal batteries (calcium–antimony electrodes) and lead-acid grids.
Largest producer: China
Electrodes and current collectors in Form Energy's iron-air cells and in nickel-iron batteries.
Largest producer: Indonesia
Carbon blocks that store heat in Antora's thermal batteries.
Largest producer: China
Rural Utilities Service · RUS-ARC-2026 · due 2026-11-20
DoD USAF SBIR · DAF27BZ01-DV013 · due 2026-11-25
DoD NAVY STTR · DON27TZ02-NV010 · due 2027-01-06
DoD DTRA STTR · DTR27TZ02-NV003 · due 2027-01-06
CPUC