Much work has been done to develope the energy production and load allocation systems for steam boilers in pulp and paper industry. In multi-fuel power plants several problems exist, as load allocation, steam power smoothing and fuel allocation including the fuel power control. The aims will be energy savings so that the boiler has a stable behaviour even in load change situations and also when the feed of the fuel is disturbed.In our case the problem is to use two different size multi-fuel boilers optimally. Both boilers use peat, coal, natural gas and oil as fuels. On the load part the main disturbances are caused by the start-ups of the paper machine and the failures in the paper production line. On the other hand also the fuel supply especially the feeding of the peat can be disturbed for many reasons. The moisture and the heat value of the peat may vary as well as the volumetric fuel feed in the feeder. To optimize the use of the boilers a special network as function of load and fuels should be generated. This has been done by using the real measurements and on the basis of the expectations concerning the energy needs of the paper machines.The steam pressure and the steam power disturbances on the steam side have been smoothed by using the feed water tank as a storage for the system. Moreover by using the furnace as an active actuator the effect of these disturbances can be compensated also on the supply side of the fuel. To carry this out the fuel power estimation and control methods developed in our earlier studies should be used.The paper deals with the real-time computing system for load allocation calculations in a paper mill where two boilers are used as steam generation source for several paper machines. The fast load disturbances are smoothed by the feedwater control system. The rest of the disturbances will be compensated on the combustion part of the boilers. The system includes one minicomputer and three microprocessors for compensation and allocation purposes. The man-machine communication will be carried out by the minicomputer.