Polish Power Grid Company prepares forecasts of power generation development using the IPM model. The new version of this model is able to optimize coal supplies for each power station, but requires data on available coal in the form of stepwise supply curves. These needed to be prepared on the basis of long term coal mines development plans and aggregated that each curve represents producers of a particular coal grade. Two models have been worked out to prepare appropriate data. The first or coal mining model, simulates functioning of coal mines in a competitive environment, and selects those mines which should be cIosed. The constraints for this model are expected demands of consumer groups and emissions limits for power generation. The model results give possible range of supply, both quantity and quality of coal. The second model, balances these supplies with power generation coal demands. Each power station demand is considered to be met by supplies of aIlowed coal grades and simultaneously emissions need to be below limits. These models and IPM model should work iteratively to secure equilibrium of supply and demand at lower costs.