Samlast is a model which integrates market simulations (Energy Management and Power Simulation model) with load-flow analyses. It provides a substantial improvement in relation to earlier models when it comes to simulations of main grid utilization in a market-based power system dominated by hydropower. With increased efficiency demands on the electricity supply industry that have a monopoly and income limits on electricity delivery, it is increasingly important to make correct decisions about grid reinforcements.
 
 The model provides results which give a significant improvement in the calculation of the utility values for different components in the power system. Energy losses and loss utilization times may be calculated for single lines or sections of the grid, and mean yearly energy delivery can be calculated from the simulations. With 60 years of inflow statistics and four price area levels for each week, a total of 12 480 load-flow situations can be analysed.

The model is mainly utilized by the main grid companies in Norway, Sweden and Denmark. With detailed data for the production system, main grid and the market in the Nordic countries, this is the most comprehensive model for power system simulations available in Scandinavia today.