Due to continued strain on the electrical grid, ice storage and other energy storage technologies are gaining traction in order to reduce electricity demand. Ice storage technologies enable building owners to generate the cooling needed for their buildings during times when electricity is less expensive and generated in a cleaner, more efficient manner. That cooling is then stored and utilized at times when electricity is more expensive and not generated as responsibly. This results in an environmentally responsible solution that saves building owners money year over year.


HIGHMARK is strategically positioned with Cristopia ice storage technology. Cristopia's STL technology ensures the smallest footprint, while maximizing ROI for building owners. HIGHMARK's employees are well trained in ice storage systems and have been involved in numerous designs around the world. We are chiller- and BMS-agnostic, so our recommendations and optimization strategies will not corner your design or procurement process. Cristopia:

Has more than 3,000 installations worldwide.
Shifts more than 6 million kWh of electricity daily from peak to off-peak hours.
Saved over 500 MW in demand.


By deferring HVAC cooling production to off-peak hours through storage technology, energy costs can be reduced by up to 50% due to significantly lower energy prices on nights and weekends and the avoidance of costly peak-demand and spike charges.


By responding to Con Edison and NYISO load-relief programs, buildings qualify for utility rebates for the energy not used during peak hours – a win-win resulting in greater grid efficiency and a better bottom line for building owners.


Renewable energy production is inherently difficult to predict since it depends on the weather. By controlling how a building consumes energy, Building Load Deferment strengthens the position of renewables in the overall energy mix and curbs the use of conventional power plants, in particular the least-efficient ones, which supports sustainability efforts.


Energy costs can be reduced and renewables supported all while the same high level of indoor comfort for building occupants is maintained.


The system is composed of a tank filled with nodules (balls) and heat transfer fluid. The number of nodules in a system determines both the heat exchange rate between the nodules and the heat transfer fluid, as well as the total energy stored.

The spherical nodules (balls) are blow molded from a blend of polyolefins and filled with PCM (Phase Change Material). The 98 mm diameter nodules (nodules AC and AN) can be manufactured to change phase at nearly any temperature between 4°F and 32°F. In addition to their outstanding thermal performance, Cristopia's nodule has a long lifespan, the equivalent of 30 to 40 years of use under normal conditions. 

The heat exchange between the nodules and the system is done by means of the heat transfer fluid in a completely customizable tank. The sizing of the tank is calculated in terms of the installation and the required capacity. Numerous tank solutions can be utilized, such as:

  • Poured Concrete
  • Vertical Steel Tanks
  • Horizontal Steel Tanks
  • Modular / Panelized Fiberglass Tanks


Building Load Deferment (BLD) was developed by HIGHMARK as a pre-engineered factory-built system. BLD is a "plug-and-play" system that can be deployed anywhere in a building while delivering all of the benefits of other ice storage systems. Learn more about BLD by clicking here.


HIGHMARK offers design assistance or turnkey solutions for owners, engineers, and architects who are looking to utilize thermal storage systems to  maximize operational savings at the smallest possible footprint. Custom solutions are ideal for new construction projects or major renovations such as chiller replacements. Through HIGHMARK's years of experience and Cristopia's superior technology, building owners can realize up to 50% savings in energy costs while reducing carbon emissions and strain on the electrical grid.