Bulgaria has been caught between the EU’s net-zero carbon ambitions for 2030 and 2050 and the country’s slow democratisation and diffusion of renewables and energy efficiency. To develop effective policy measures, the Bulgarian government needs to draw evidence-based consistent decarbonisation pathways for each economic sector with annual targets for continuous monitoring. This is especially true considering that there is so far little connection between the government’s own strategic documents (i.e., the 2030 National Development Programme, the National Recovery and Resilience Plan and the National Energy and Climate Plan) and the EU’s long-term objectives for a low-carbon transition. This Policy Brief plots Bulgaria’s options along three scenarios with a 2050 horizon using an innovative decarbonisation transition modelling instrument, called The Calculator. It helps bridge the gap between the complicated integrated climate and energy models and the practical dilemmas of policy-makers preparing Bulgaria’s long-term decarbonisation strategy.