Abstract Energy consumption could has great impact of economic development and on carbon dioxide emission (CO2) intensity. However there are many possibilities to avoid these undesirable problems. One of the solution is to use more alternative and renewable energy sources but CO2 emission intensity from the other sources need to be investigated more. Therefore in this article was analyzed the CO2 emission intensity based on the alternative, fossil and renewable energy. It was analyzed also the economic growth based on the CO2 emission intensity. Neuro-fuzzy method was applied to select the most impactful energy factor for the CO2 emission intensity and economic growth. Presented results confirmed that the alternative energy has the highest influence on the CO2 emission intensity. CO2 emissions intensity from solid fuel has the highest influence on the economic growth.