OpenGIS4ET aims to extend the H2020 Hotmaps platform, an open-source heating and cooling mapping and planning toolkit and to provide default data for EU28 at national and local levels. it allows public authorities and energy planners to identify, analyse, model and map resources and solutions to meet energy needs in their area of responsibility in an efficient and cost-effective manner. This project comes as an extension to add open APIs to the base platform. This platform reached TRL-7 and we want to add new plug-ins called calculation modules (CM), to plan the electric mobility and flexibility strategy. The different temperature levels for district heating will be added to the economic and technical simulations. It helps authorities to develop local, regional, and national heating, cooling, mobility, and sector coupling strategies, that are in line with RES and CO2 emission targets. New developed plug-ins and functionalities will be demonstrated by need-owners to reach TRL-8.