We have created this eTwinning project called 'STEM for Sustainability: Prague and Salt's Perspectives' where students from Salt and Prague collaborate to explore sustainability and the future of electricity consumption (SDG 7), along with sustainable inventions for cities and communities (SDG 11). Through engaging activities and discussions, we aim to foster cross-cultural understanding and promote a more sustainable future. This eTwinning project is also part of an Erasmus+ group of students' mobility, which will involve mobilities to both countries.