This directory focuses on grid-connected storage for renewable energies.

technology providers

ammonia

• NHThree   solid state ammonia synthesis SSAS

chemical storage

• Boulder Ionics    manufacturing high-purity ionic liquids for batteries/ supercapacitors
• Cnano nanotubes for energy storage applications
• EnerG2    materials for Li-Ion, lead acid, supercapacitors
• eSionic    engineered-molecules (porphyrins) liquid electrolytes
• QuantumScape    electron storage batteries
• Simbol Materials   extract and refine battery materials (Li, Mn, Zn), geothermal brine extraction
• SiNode    anodes for Li-Ion batteries

flow batteries

• 24M Technologies Cambridge crude
• American Vanadium    vanadium, PNNL license, setting up vanadium mine in Colorado, acquired Gildemeister energy storage division from DMG Mori Seki
• Bettergy Corporation   zinc air
• DMG Mori Seiki    acquired then sold Gildemeister energy storage, Germany, vanadium, acquired Cellstrom from Younicos
• Energy Storage Systems all iron flow technology
• EnStorage    Israel, hydrogen bromine
• EnerVault   iron chromium
• ESS   all iron
• General Atomics   soluble lead
• Imergy Power Systems used to be Deeya, US/India, vanadium
• Vionx Energy, previously Premium Power, first zinc bromine, now vanadium redox flow
• Prudent Energy   China, vanadium, acquired VRB Power Systems
• Primus Power   zinc bromine
• Redflow   Australia, zinc bromide
• REDT    UK, vanadium
• Ronke Power China, vanadium
• Sun Catalytix    quasi-neutral pH aqueous electrolytes, previously engaged in artificial leaf H2 synthesis
• Sustainable Innovations  joint project with Harvard, quinone bromine
• UniEnergy Technologies  vanadium, PNNL license, getting into integration
• ViZn Energy    zinc iron, previously named Zinc Air Inc.
• WattJoule vanadium, PNNL license
• ZBB Energy    zinc bromine, short of cash

lead acid batteries

• Axion Power    lead carbon, factored by Viridity
• C&D    lead acid, VLA, VRLA, robust systems
• Ecoult    lead acid + ultracapacitor (owned by East Penn)
• Enersys   multiple industries and product lines
• Exide   dissolved grid-focused Li-Ion division ReStore Energy Systems, US parent operating under Chap 11 bankruptcy
• GS Yuasa    Japan, multiple product lines
• Johnson Controls    largest US provider, focus on automotive
• (grid edge) Gridtential     advanced lead acid semiconductor-enhanced for modern manufacturing
• Shin-Kobe    Japan, purchased by Hitachi
• Storage Battery Systems    lead acid, NiCd, custom battery and system design for utilities
• Trojan Battery    advanced lead acid
• Xtreme Power  batteries and system integration, in bankruptcy reorganization

liquid metal batteries

• Ambri    previously Liquid Metal Batteries

lithium ion batteries

• A123 Systems  out of bankruptcy, now owned by Chinese concern Wanxiang Group
• AllCell Technologies    phase change thermal management for hot environments
• Altairnano    lithium titanate Li4Ti5O12 (LTO), purchased 2012 by Chinese Canon Investment Holdings, moving to China
• Ballast Energy    cost reductions through the structure of battery scaling
• Boston-Power    China, blocks and modules, custom and application-specific battery design
• BYD    China, Lithium iron phosphate LiFePO4 (LFE), Warren Buffett owns some stock
• CALB    China, state-owned
• Johnson Controls    expanding outside automotive
• LG Chem    Korea
• Lithium Energy Japan    Japan, GS Yuasa + Mitsubishi venture, some applications packaged for energy storage
• Lithium Energy and Power GmbH    Germany, next generation Li-Ion battery development
• Microvast   US but R&D and manufacturing in China, LTO, LFE
• Oxis Energy UK Lithium sulfur
• Panasonic    Japan (also includes Sanyo)
• PolyPlus    lithium air, lithium water, lithium sulfur
• Saft    France
• Samsung    Korea, LMO (Lithium manganese oxide), kept batteries & R&D from dissolved SB LiMotive Joint Venture w/ Bosch
• Sanyo    owned by Panasonic
• Seeo    solid state polymer
• Sion Power    lithium sulfur, license from Polyplus
• Tianjin Lishen    China, factored into other company products (Coda)
• Toshiba    Japan, SCiB (LTO)
• XALT Energy    previously Dow Kokam, purchased by Townsend Ventures (controlling interest)
• (Grid Edge) 4R Energy    Japan, Nissan/ Sumitomo joint venture
• (Grid Edge) Sonnenbatterie     based in Germany, owned by Prosol, residential storage systems, factors Eguana inverters
• (Grid Edge) Stem    previously Powergetics
• (Grid Edge) Tesla partnership with SolarCity (factors Panasonic)

metal air batteries

• Eos Energy Storage    zinc air, factors Ideal Power inverters
• Fluidic Energy    zinc air
• Phinergy    aluminum air
• ZAF Energy    zinc air, spinoff of ViZn

molten salt batteries

• FIAMM – Energy Storage  Italy, ZEBRA type
• GE Energy Storage  Nickel Salt, ZEBRA type
• NGK Insulators | NAS Batteries  Japan, Sodium Sulphur NAS,  manufacturing restarted after battery fire incidents

nickel iron batteries (grid edge)

• ChangHong    China
• Iron Edison
• Zapp Works

sodium ion batteries

• Alveo Energy    Prussian blue dye batteries
• Aquion Energy
• Faradion UK

Compressed Air Energy Storage (CAES)/ liquid air

• Bright Energy    giant air balloon in body of water
• Dresser-Rand    geological storage: McIntosh, Bethel
• General Compression    CAES
• LightSail Energy    CAES
• SustainX    CAES

• Highview Power Storage  UK, liquid air

electromagnetic energy storage

supercapacitors

• EEStor   now owned by ZENN Motor Company
• FastCap Systems   extreme environment
• Graphene Devices Limited nanoengineered electrodes
• Ioxus
• Maxwell Technologies
• Recapping    no website, Khosla funded
• Skeleton Technologies   Estonia

Superconducting Magnetic Energy Storage (SMES)

• ABB    Switzerland
• American Superconductor
• ASG Superconductors     Italy
• Fujikura    Japan
• Nexans SuperConductors    Germany

Electrothermal Energy Storage (ETES)

• ABB    Switzerland, supercritical CO2 cycle (ASME article summary)
• General Electric    supercritical CO2 cycle (ARPA-E Grant PDF)

gravity

• Ares North America  trains on rails
• Energy Cache    gravel and ski  lift
• EscoVale    moving giant boulder up/down with pumped hydro

grid-tie inverters (GTIs)

Most products list as wind- or solar-specific but can be used in storage systems. Integrated storage solutions are inverters that allow grid tie for both renewable generation and energy storage.

utility scale

• ABB    Switzerland, some integrated storage products
• Advanced Energy    aka AE, acquired REFUsol
• AEG Power Solutions    Germany, also integrates its inverters into storage systems
• Alencon Systems      innovative architecture, very compact, in development stage
• American Electric technologies | AETI    scales up to very high power systems
• Bonfiglioli    Italy
• Chint Power     China, significant US business, partners with Next Phase Solar for US service
• Danfoss    Denmark, selling inverter unit to SMA, acquired 20% of SMA
• Dynapower    owned by Pfingsten, integrated storage products
• Eaton    some integrated storage products
• Emerson   some integrated storage products
• Fronius    Austria,  modular and failure-tolerant architecture
• GE Energy
• Ingeteam    Spain, broad product line covers grid edge
• KACO new energy    Germany, some integrated storage products
• LTi REEnergy    Germany
• Nextronex
• Parker Hannifin Energy Grid Tie    also targets storage applications
• Power Electronics  Spain, aka Freesun, also targets storage applications
• Power-One    owned by ABB, some integrated storage products
• Princeton Power Systems    integrated storage products
• PV Powered
• SanRex    Japan, owned by Sancha Electric
• Santerno    Italy, also targets storage applications
• Satcon   in bankruptcy, moved to Chapter 7 liquidation
• Schneider Electric    France, acquired Xantrex
• Siemens    exited most international markets in 2013
• SMA    Germany, aka Sunny, acquired control of China Zeversolar, terminated Windy Boy line, some integrated storage products
• Solectria Renewables    aka Solren
• Sungrow    China, some integrated storage products
• TMEIC    Japan, Toshiba/ Mitsubishi joint venture
• Vacon    Finland, some integrated storage products

grid edge for grid use (in development)

• Eguana Technologies   previously Sustainable Energy Technologies,  integrated storage+solar products
• Fronius    Austria, hyper-
• Ginlong  China, limited track record outside China, combine wind + solar
• Goodwe    China, limited track record outside China
• Ideal Power    some integrated storage products, packaged by EOS Energy
• Outback Power    some integrated storage products, distributed residential
• Platinum    Germany, acquired by Mutares AG from Diehl in 2013, now in bankruptcy
• Power-One    owned by ABB, some integrated storage products
• SolarMax    Switzerland, owned by Sputnik Engineering
• Solax Power    China, limited track record outside China, integrated storage products
• Xantrex      owned by Schneider, web site for low power products only, XW integrated storage products (not listed on site), distributed residential

hydroelectric pumped storage

• Alstom   France
• Gravity Power   underground drilled storage
• Sinohydro    China
• Voith Pumped Storage    Germany

hydrogen

The hydrogen sector is broad. Here we focus on what can be used for grid-connected storage in relation to renewable energies. For instance, fossil fuel steam reforming is not in the scope.

• Acta   Italy, electrolysis + fuel cell
• AFC Energy   UK, platinum-free fuel cell
• Areva   France, strategic partnership with Schneider, electrolysis + fuel cell
• Ballard Power Systems    H2 fuel cells, distributed generation+
• ENrG    ultra-thin ceramic membranes for HT fuel cells
• Firewater Fuel    platinum-less electrolysis
• GEI Global Energy    acquired by Suja Minerals, hybrid fuel cells+batteries
• Hydrexia    Australia, solid MgH2 hydrogen storage
• Hydrogenics    Electrolysis + fuel cell
• ITM Power   UK, electrolysis
• McPhy   France, electrolysis + solid MgH2 hydrogen storage, acquired Enertrag HyTec
• Proton OnSite   electrolysis

• GE Energy     H2 turbine (PDF) (only operating H2 turbine in world, at Fusina, IT)
• Siemens   Germany, H2 turbine
• Toshiba    Japan, H2 turbine (progress unclear)

kinetic energy – flywheels

• Amber Kinetics    motor rotors as flywheels
• Beacon Power  out of bankruptcy, now owned by Rockland Capital
• Powerthru   previously owned by Pentadyne
• Temporal Power
• Velkess   financed through Kickstarter
• Vycon

• (Grid Edge) Active Power

management and operating systems for energy storage

• 1Energy Systems    ESS softare harness
• Demand Energy    real time energy management OS
• Enbala    previously Semba, use existing demand-side process energy storage to time-shift load
• GELI     real time energy management OS
• Greensmith Energy Management    battery-agnostic operating system, integration
• Intelligent Generation  distributed network storage as a virtual power plant
• Nation-E    energy storage management and cyber security
• Toshiba    Japan, μEMS grid management system includes batteries, acquired Consert
• Viridity Energy    energy dispatching systems management with storage, factors Axion Power batteries
• Xtreme Power  battery management system (BMS), in bankruptcy reorganization

Thermal Energy Storage (TES)

storage with concentrated solar thermal (CSP)

• Abengoa Solar   Spain, solar thermal, molten salt, acquired Siemens CSP assets
• BrightSource   solar thermal, steam-to-molten-salt (not Ivanpah)
• eSolar   CSP tower + molten salt technology provider
• Novatec Solar   Germany, solar thermal, water boilers
• SolarReserve   solar thermal, molten salt, exclusive license from Pratt & Whitney Rocketdyne
• Terrafore    encapsulated, lower cost molten salts storage
• Terrajoule   solar thermal, pressurized saturated water, steam engine generation
• Torresol Energy   Spain, solar thermal, molten salt

other thermal storage

• (Grid Edge)  CALMAC   off-peak cooling
• CRYOGEL    ice balls
• Halotechnics   heat storage materials: molten salt, molten glass
• (Grid Scale/Grid Edge)  Ice Energy   off-peak cooling
• Isentropic   UK,  pumped heat storage between two gravel tanks at different temperatures
• (Grid Edge) Steffes   off-peak heating

Energy Storage Systems (ESS) integrators

Companies with national or international footprint only.  Some entries may be present under both categories (“technology providers” and “ESS integrators”).

• ABB Battery Storage Systems    Switzerland, Li-Ion mostly
• AES Energy Storage  Li-Ion mostly, market leader in Energy Storage deployments
• Beckett Energy    Li-Ion mostly, packages Boston-Power for grid/ other applications
• Bosch Power Tec    Germany, kept systems group from dissolved SB LiMotive Joint Venture with Samsung
• BYD    China, Li-Ion mostly
• C&D Integrated Power Systems   ruggedized power systems for utilities
• Durion    Germany, from kW to MW, packages Siemens controls and LiFePO4
• EaglePicher    hybrid battery systems capability
• Greensmith Energy Management    battery-agnostic operating system, integration
• Hitachi   Japan, new CrystEna Li-Ion systems
• OptiGrid Stored Energy    owned by (and factors) Enersys, Li-ion/ lead acid/ other chemistries,  fully financed model
• Parker    energy storage system integration with company inverters
• Powin Energy    Li-Ion
• Princeton Power Systems
• Storage Battery Systems    lead acid, NiCd, custom battery and system design for utilities
• S&C Electric   some focus on sodium sulfur
• Siemens Siestorage    Germany, Li-Ion mostly
• Toshiba    Li-Ion
• Vanadis Power    Germany, vanadium flow, factors UNiEnergy, Rongke Power
• Xtreme Power    lead acid and Li-Ion, in bankruptcy reorganization
• Younicos    Germany, Li-Ion, sodium sulfur, vanadium redox flow

• (Grid Edge) CODA Energy   post bankruptcy refocus for Coda, Li-Ion battery systems, factors Princeton inverters
• (Grid Edge) eCAMION    Li-Ion battery systems
• (Grid Edge) Green Charge Networks    Li-Ion battery systems, new leasing model through TIP Capital
• (Grid Edge) Power-One    Li-Ion systems and company inverters
• (Grid Edge) Silent Power    closed in Jan 2014
• (Grid Edge) Solar Grid Storage    Li-Ion battery systems, factors AllCell (PDF)
• (Grid Edge) SolarCity  partnership with Tesla, Li-Ion battery systems
• (Grid Edge) Stem    previously Powergetics
• (Grid Edge) Sunverge Energy   distributed storage in smart metering areas, spinoff from Inertia Engineering
• (Grid Edge) Tumalow  user financial model based on savings

This directory focuses on grid-connected storage. Did we leave a company out (we did for sure…)? Request us to add to or edit the directory here.