Segment
Energy Service Companies
Invest in a thermal energy asset that provides consistent savings over 25 years.
Energy service companies (ESCOs) live and die by the savings they can guarantee under contract or by creating margin on the sold kWh of heating or cooling. Cartesian gives ESCOs a bankable, fully monitored asset that drops cleanly into performance contracts, Energy as a Service portfolios and multi-site rollouts. Fully instrumented to feed measurement and verification straight into your energy monitoring for billing and reporting. Size your chillers and heat pumps closer to average load than peak load, secure optimized thermal energy production to create a predictable, multi-year cash flow.
Energy service companies deliver guaranteed savings under long-term contracts. Thermal Box is bankable, measurable and modular.
Common use cases
- Performance contracts
- Energy as a Service portfolios
- Multi-site rollouts
Typical outcomes
- Consistent savings
- Perfectly combined with heat pumps, chillers and PV
- Data access to performance
Why now
Common pain points in energy service companies
Energy Service Company portfolios cut across many segments — but the common need is a bankable, monitorable asset that delivers measurable savings under contract. Secure your margin on the delivered kWh by optimizing production.
- Performance contracts demand savings that survive year-on-year
- Capex-heavy interventions are hard to bank without proven assets
- Customers want Energy as a Service, you need predictable hardware behaviour
Indicative sizing
Per-site economics across a portfolio
- investment in chiller / heat pump
- 10–30%
- savings generated
- Consistent
- full access
- Performance data
Common questions
Got questions about thermal storage?
From PCM chemistry and lifetime to indoor vs outdoor installs and typical payback — the answers are in the full FAQ.
Read all questionsWhat is thermal energy storage?
The term is used when storing energy as heat or cold, which can be released at a later stage. The heat or cold is usually stored when energy is cheap and then released when the heating or cooling demand is at a peak or the cost of energy is high.
What is PCM?
PCM means Phase Change Material and refers to any material that changes state, for example from solid to liquid, when reaching a certain temperature. This phase change enables large amounts of energy to be absorbed or released. Water is one PCM, storing cold at zero degrees Celsius by changing phase to ice. Cartesian uses a wide variety of other materials, such as bio-based waxes, to store heat or cold at different temperatures.
Is the Thermal Box and the PCM flammable?
For applications with HVAC systems, Cartesian's Thermal Box is not considered flammable. While some PCM might be flammable when they reach temperatures above 100 °C or more, the Thermal Box is designed to eliminate any risks of reaching flammability conditions in operations.
Are PCMs safe?
Cartesian offers only safe PCMs and primarily uses bio-based PCMs in the Thermal Box. The PCM will stay in the Thermal Box for its whole lifetime and is not consumed during operation. The Thermal Box is also designed to avoid any risk of PCM leakage.
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