The electricity companies own and run the grid and are responsible for transporting the electricity from production sites to the users. This takes place via the three levels into which the Swedish grid is divided: the national grid, regional grid and local grid. They have different voltages and are owned by different grid companies. Sweden has about 170 grid companies of varying sizes. The national grid is owned by Svenska Kraftnät. The electricity is transported from large producers to the regional grids via the national grid. Three grid companies – E.ON Elnät Sverige, Vattenfall Eldistribution and Fortum Distribution own the majority of the Swedish regional grids. The regional grids then transport the electricity on to local grids and even directly to customers who use large quantities of electricity. e.g large industrial plants. The local grids distribute to private households, factories, etc. These are owned not only by the state, municipalities and private companies but also by economic associations. A grid owner must have a permit, known as a grid concession, from the Energy Markets Inspectorate in order to build and operate high-voltage power lines. The grid concession also includes an obligation to connect electricity plants in the concession area and the responsibility for collecting and reporting measurement values for use and production.