The ability to effectively store energy is among the most pressing challenges as we move towards a more resilient and sustainable future using renewable energy.

Air conditioning comprises a majority of peak loads, and energy storage is needed to match the intermittent generation of sustainable resources like wind and solar with the relentless power needs of the hottest summer days. TES’ Ice Bear technology is flexible, reliable and enables a more efficient and renewable energy future by storing energy through the simple, abundant, and inexpensive medium of ice.

The Ice Bear product enables customers to be strategic about their electricity consumption from air conditioning: they can take advantage of times when utility rates are lowest to both save money and reduce their carbon footprint. Our Ice Bear line of products turn air conditioners into resilient, efficient and sustainable energy storage. The Ice Bear is a distributed ice-powered battery allowing customers to create up to 40 ton hours of thermal energy storage a day:

  • The Ice Bear turns a standard HVAC into a hybrid HVAC with an ice battery
  • The Ice Bear is scheduled to charge by freezing ice in an insulated tank
  • When dispatched, the Ice Bear turns off the HVAC compressor automatically and provides ice cold refrigerant to the AC unit
  • The Ice Bear offers flexible energy storage capacity that can be scheduled to meet the customer’s most pressing cooling needs, typically during the peak electricity consumption period
  • Seamless installation of an auxilliary Ice Coil in the HVAC allows Ice Bear to utilize existing air flow of buildings and residences

Ice Bear 40

Up to

21 kW

of on-peak reduction

Up to

8 hours

ice discharge duration

20 tons

AC cooling capacity

  • Accommodate multiple HVACs configurations and sizes up to 20 tons
  • Provides cooling from stored ice instead of running a HVAC compressor (compressor automatically shut off during ice melt hours)
  • Permanent peak load shift of AC loads
  • Smart grid controller and mobile connectivity provide real-time control and demand response capabilities


Contact us for pricing, as commercial terms depend on application.

Ice Bear 20

Up to

7 kW

of on-peak reduction

Up to

20 ton hours

ice discharge duration

5 tons

AC cooling capacity

  • Ice Bear 20 is an all-in-one AC & thermal energy storage device that fully replaces residential condensing units
  • The Ice Bear 20 turns off integrated HVAC compressor automatically when ice is used for cooling
  • Supports residential applications that use ductless mini splits and traditional ducted systems
  • Smart grid controller and mobile connectivity provide real-time control and programming ability


Contact us for pricing, as commercial terms depend on application.


Proven, flexible and highly reliable technology

Over over 1,500 units deployed comprising over 20 MW of storage capacity

Cost Savings

Customers realize a 20 to 40% reduction in utility costs

High Efficiency

100% effective efficiency, 85% round-trip efficiency1

Easily Deployable

No construction permit or utility interconnection required; only an HVAC building permit and coil installation required

Long term useful life

Units have a long-term economic life of 20 years+ and will improve the life of HVACs by reducing compressor cycles

Renewable Generation Integration

Enables renewable grid integration by scheduling ice charge and ice dispatch around renewable production

Remotely Monitored

Units are remotely monitored and can be scheduled or programmed for on-demand storage

Emissions Benefits

Ice Bear enables customers to move load to less carbon-intensive and more renewables-weighted hours on the grid

No Hazardous Chemicals

No fire or hazardous chemical risks; storage medium is tap water, all product parts are recyclable

1 Efficiency is based on nighttime charging temperatures vs. daytime discharging temperatures. In climates with large day vs. night temperature changes (e.g. California, Arizona, Florida), the round-trip efficiency is greater than in climates with low day/night temperature swings (e.g. Hawaii)