In The Netherlands Municipalities, Universities and Healthcare organizations all have targeted to meet the Paris agreement targets, ‘Nett Zero Carbon’ namely 95% CO2-emission reductions compared to 1990, long before 2050. To support these organizations on their journey to meet their targets effective and efficient, regarding Carbon emissions as well as costs, a dynamic approach called FastLane is developed. FastLane has already been used for more than 2,500 buildings in more than 120 portfolio roadmap plans. Implementing all these plans, we can significantly reduce the amount of CO2 by 2050. This approach deals with three important challenges of the energy transition: only limited time and budget available, close the energy gap between calculated and measured Carbon emissions and provide a dynamic insightful tool to monitor and control the energy transition. These challenges require a different approach than traditional energy studies to identify and select measures. In this paper the requirements, demands and benefits of the developed approach, consisting of a methodology, smart tools using databases and strong insightful presentations in dashboards, are explained. The approach is illustrated with the case of Rotterdam University of Applied Sciences with a combined portfolio of 7 buildings. Insights are given of how Rotterdam University of Applied Sciences aims to reach their targets and how they are in control doing so during their journey. A roadmap is presented with the main renovation measures including the possibilities of dynamic interventions that adapt to possible changes in the future. In this way Rotterdam University of Applied Sciences can optimise the implementation which can save up to 10-20% on the costs of the energy transition.