Siros Energy – Sustainable Power System (SSPS)

The SSPS is a patented (*pending) standalone energy system that supplies electricity to the refrigeration system of a reefer container while it is being transported on an intermodal rail wagon.

By providing this capability, the Siros Sustainable Power System (SSPS) revolutionizes reefer container land transportation by enabling reefers to be transported efficiently by rail.

The SSPS harvests train wagon kinetic energy and converts it to electricity that is stored in a battery. Energy is harvested primarily during periods in which the wagon transporting a reefer container is slowing down, moving downhill and breaking therefore utilizing energy that is otherwise converted to heat in the wagons breaking system (patented algorithm*).

The SSPS mounts to ISO reefer containers above the refrigeration system of the reefer (exactly like a standard clip-on genset). The SSPS is mounted to the reefer container before it is loaded on the train wagon and is removed at the end of the trip. A power generating element is attached to the wagons wheel axle and is connected via quick connecter attachments to the SSPS.
Innovation and Key Advantages:

The SSPS is an innovative, transformative solution that provides multiple advantages to rail companies and operators. These advantages can be classified to traction, operational, environmental, logistical remote control and monitoring as detailed below.

Raction Optimization

The SSPS utilizes a patented* learning algorithm that manages the SSPS installed on a single wagon and/or multiple SSPS units that are being used in a block train. Each SSPS system communicates via the cloud with the Siros Global Control center. The patented algorithm which is at the heart of our control center assures optimal harvesting of kinetic energy and minimization of the load exerted on the locomotive. In the event that communication does not exist the local control system of each SSPS has the ability to manage and optimize its own operation.

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From an operational standpoint the SSPS resolves the issues experienced with existing means of supplying power to a reefer such as a genset. The SSPS does not require fuel and refueling which contributes to a low life cycle cost and shorter payback. Eliminating the need for ongoing refueling resolves a key operational issue which is considered a nightmare for rail operators due to the costs, logistics and safety aspects involved with continuously having to refuel gensets.
The elimination of the fuel and refuelling is a key safety advantage since there is need for fuel tanks or tankers in and around the rail terminal that can constitute a safety hazard. In addition, storage of the SSPS does not require special consideration since the system does not have a fuel tank or fuel that during storage can pose a safety risk.


The SSPS minimizes greenhouse gases and particulate emissions that are extremely high on diesel powered gensets that utilize industrial type diesel engines to create electricity. In addition, the SSPS has an minimal, almost nonexistent, noise signature compared to a genset which makes it friendly to densely populated areas reducing the need for erection of noise barriers along rail lines passing through such areas.


Intermodal rail transportation can carry out as a block train in which the entire train and all its wagons travel from source to destination; or the more common relayed mod (hub and spoke) in which a container and its wagon are disconnected from one train and connected to a different train en-route. In this model multiple trains are used to transport the container from source to destination.
The SSPS supports a relayed transport mode since it is an independent power system that is attached to the intermodal wagon, providing continuous electric energy to the reefer container. The wagon can be easily detached from a one train and reconnected to another train with zero interruption to the power supply of the reefer container.