Polish photovoltaics (PV) installer Columbus Energy SA (<a href="https://www.gpw.pl/company-factsheet?isin=PLSTIGR00012" target="_blank">WSE:CLC</a>) has signed a non-binding term sheet with the renewables arm of Ukrainian private energy group DTEK about a potential investment in the deployment of 398 MW/1.6 GWh of energy storage facilities.