Operail, the Estonian capital based railway company, carried out the first test charging of GE C30 locomotive batteries in Estonia using the COOLERGIZER mobile charger developed by the European company COOLERGY. The charging was carried out in Tapu depot.
“We practiced to charge the batteries of the American GE C30 diesel locomotive GE C30 at whole junction station, Tapa, where the depot of our partner company Operail is located, together with which we make hydrogen locomotives for work in the Free Port of Riga” the Kirill Lyats, CEO of COOLERGY said. “Thus, in Estonia alone, we practiced charging a car, yacht, airplane and locomotive with the Coolergizer – almost all the main types of transport.
In a couple of months, here in Tapa, the first test runs of the TGM 4 H2 hydrogen locomotive will take place, on which two COOLERGIZER will eventually be installed, which, together with the battery pack, will allow for a peak load of up to 500 KW”. 
COOLERGIZER, as the power generator is called, is an environmentally friendly and low-noise mobile charger with hydrogen fuel cells.
COOLERGIZER is designed to power and charge aircraft at airports, ships at ports, mobile refrigerators, electric vehicles and other applications.
The presented COOLERGIZER has an output power of up to 40 kW with the possibility of increasing to 80 kW, as well as a voltage of 27 to 380 V. It is designed for autonomous power supply or recharging of objects remote from public networks and without access to “green” energy.
Earlier, the COOLERGY team reported that on April 22, 2025, they began the “Great Hydrogen Journey” with COOLERGIZER from Tallinn to Madrid.
The first stop of the journey was the area in front of the central office of Eesti Energia/Enefit in Tallinn. Specialists from Coolergy S.L. demonstrated to partners from the largest energy company in the Baltics the efficiency of a mobile charger using hydrogen as fuel.
Representatives of COOLERGY and Enefit/Eesti Energia, who are already cooperating on hydrogen projects in Estonia, discussed further steps to hydrogenate the economies of the Baltic states.
Another stop was the Olgina airport complex, located near Narva, where COOLERGY specialists charged the batteries of the Wilga 35A aircraft right on the runway.

The “Big Hydrogen Journey” with COOLERGIZER from Tallinn to Madrid continues.