The analysis and overview of the current condition of the heat sector of AB Jonavos Šilumos Tinklai was carried out by determining the main technical - economic performance indicators. The need of investment in the route modernization project and an investment plan, balance of financial flows and the risk and sensitivity analysis were provided in the investment project. Investments were coordinated with the National Commission for Energy Control and Prices, and an application for funding from the Lithuanian Business Support Agency was prepared.