Description of the statistics

Operating statistics

The data on electricity consumption that is shown on "The control room" page and on Nord Pool's website is based on Svenska kraftnät's preliminary calculations of the country's electricity consumption.

The calculation is based on the balance provider's production plans and are corrected with 'hidden production' (see explanation below) and the measured transfer abroad, mainly through the national grid. Since the calculation of consumption is based on production plans, there are discrepancies between the information in the operating statistics compared with the statistics based on the balance settlement.

The quality of the statistics from the balance settlement is higher than the operating statistics because it is based on measured production and consumption, and it also takes the import/export via networks at lower voltage levels into account. However, not all production or consumption is included in the statistics, see the 'Hidden production' section below.

Hidden production

Hidden production refers to the production within closed distribution networks (industrial networks, etc.) which is not reported for balance settlement. Because only network owners are required to report input from production to their own distribution network for balance settlement, the production from closed distribution networks is only reported as net input, or not at all if consumption is higher than production.

Consumption data for consumption within closed distribution networks are correspondingly underestimated to the same extent as hidden production. Hidden production is therefore only partially included in the statistics from the balance settlement. In Svenska kraftnät's operating statistics a profile is used that corresponds to an estimate of the hidden production.

The profile for hidden production is calculated by comparing energy values retrieved from the official production on a weekly basis to Svenska kraftnät's statistics from the balance settlement. Distributing the weekly energy values for hidden production per hour so that hourly value's weekly amount is consistent with the hidden production's energy value leads to a periodically correct amount of energy, but an uncertain hourly distribution.

Hidden production means that the statistics for 'Other thermal power' and 'Hourly consumption' are initially too low. Hidden production is estimated to be approximately 350 - 400 MW (December 2014).

Production

The statistics that show total production for Sweden are divided by type of production. Since 2001, it has been possible for the measured values for different types of production to be reported separately, which has meant that statistics have gradually been refined. Earlier production was reported as 'unspecified production'. From the summer of 2008 only a small proportion of production is reported as unspecified.

Gas turbine and diesel power (power reserve)

The measured values that are reported under this heading relate to the production in case of disturbances in the network. Gas turbines and diesel-based production that is used at base power plants with or without heat recovery (district heating or industry conglomerates) is not included under this heading.

Other thermal power

This heading includes production from thermal power plants excluding nuclear power or standby power regardless of the fuel type (coal, oil, wood fuels, household waste, etc.).

Unspecified production

This heading includes production/input of electricity from solar cells, regenerative energy from railway operations, net of estimated production where there is no measurement on the generator (in non-concessionary networks), etc.

Unspecified consumption

This heading includes production/withdrawal of electricity from the grid where there is no measurement at the exit points in non-concessionary networks, and therefore losses and consumption does not have to be separated.

Losses which are measured hourly

In networks where all the input to and output from the network is measured per hour, e.g. the national grid and regional networks, the network owner must report network losses separately for balance settlement. This means that conditions for obtaining good quality statistics for these losses exist, if the collection and reporting of meter readings for production, consumption and exchanges with other networks is correct.

Profile settlement consumption and losses

Reporting of profile settlement of consumption and losses is based on the allocation of the net area's consumption profiles for profile settlement. Distribution takes place by means of preliminary load profile shares. Distribution is linear, that is all the hours in a month are divided by the same percentage. This means that in theory losses are underestimated because they have a square relation to transfer (higher losses during the day than at night when there is a low transfer rate).

Our aim is to achieve a stable quality to analyse the difference between the preliminary settled amounts of energy and the actual delivered energy, to get an idea of how large the error settlement for losses is after the introduction of monthly measurement.

Exchanges with other countries/bidding area

The data reports the amount of energy which has been transferred across the border to the surrounding area (neighbouring country or bidding area) in the period.

Net import/export

The data shows the amount of energy which has been imported to or exported from the area (Sweden or bidding area) in the period.

Transmission

The data reports the amount of energy which was transmitted in the area (Sweden or bidding area) in the period. This means energy which does not stay in the area. The concept of transmission in the statistics for Sweden differs from ENSTO-E's concept, among other things because all foreign connections, regardless of voltage levels, are listed in the electricity statistics.

Loop Force

Loop force is the flow a particular hour from one connection into a bidding area and out of the same area to another connection. For example, from the area NO1 ( Norway ) via a connection to the bidding area SE3 ( Sweden ) and then back to NO1 via another corridor.