To lead an effective energy transition, you need not only regulations, but also good, modern computing tools. The world is changing rapidly - the winner will be the one who is able to plan strategically, but also react to changes and minimize costs. In order to meet these challenges, the Energy Forum, together with Enercode, has taken on the task of building an open energy model that will support the planning of the modernization of the Polish energy sector, taking into account the acceleration of the development of renewable energy sources.