What is the power grid?
Direct answer
The electricity grid is the connected network of cables, high-voltage lines and stations that transports power from generator to user. It works in layers: TenneT's national high-voltage grid carries electricity over long distances, and the regional grid operators bring it to homes and businesses via medium and low voltage. Transformer stations link the layers.
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What is the power grid: scattered information versus Energy Intelligence
Electricity travels a long way before a machine or charging point runs. An offshore wind farm, a gas plant or a roof full of solar panels generates power, and that power has to be used elsewhere. The electricity grid is the transport system that links generation and consumption. For a business owner, that grid usually only becomes visible the moment an expansion cannot go ahead, because no transport capacity is free in the region.
- TenneT operates the national high-voltage grid (110 to 380 kilovolts); regional grid operators such as Liander, Enexis and Stedin run the medium and low-voltage grids in their area.
- Supply and demand must balance at every moment: when the grid is exactly in balance, the frequency is 50 hertz. If it deviates too far, power outages threaten.
- In many places the grid is full (grid congestion), which puts businesses on a waiting list for a new or heavier connection.
Insight
Traditional approach
Information is scattered across portals, documents, invoices or separate spreadsheets.
Modern approach
Data, context and interpretation are brought together into a clear decision picture.
Decision-making
Traditional approach
Choices are made based on averages, assumptions or occasional analyses.
Modern approach
Scenarios, KPIs and current measurement data make the trade-off more concrete and repeatable.
Follow-up
Traditional approach
Actions often stay non-committal or disappear into separate reports.
Modern approach
Follow-up actions, monitoring and reporting are linked to the same energy data.
How is the electricity grid built up?
The grid works in layers, comparable to a road network running from motorways down to streets. At the top sits TenneT's national high-voltage grid, which carries power at 110 to 380 kilovolts over long distances across the Netherlands. That high voltage is needed to limit losses over long distances. High-voltage substations then step the voltage down to medium and low voltage. The regional grid operators, such as Liander, Enexis and Stedin, bring that power to businesses and homes through their medium and low-voltage grids. Transformer stations form the links between the layers: they convert a high voltage into a lower, usable one.
- The national high-voltage grid (110 to 380 kilovolts) belongs to TenneT and bridges long distances.
- The regional grid operators run the medium and low-voltage grids in their own area.
- High voltage, medium voltage and low voltage are successive levels.
- Transformer stations connect the layers and step the voltage down gradually.
Why must the grid stay continuously in balance?
Electricity can barely be stored at grid scale, so whatever is consumed has to be generated at that same moment. Supply and demand must therefore be balanced at all times. When generation exactly equals consumption, the grid runs at a frequency of 50 hertz. If that frequency drops too far below or rises too far above 50 hertz, power outages threaten. TenneT guards this balance as the national grid operator. When an imbalance looms, TenneT activates reserve capacity to bring the frequency back to 50 hertz. Solar and wind make this harder, because their output varies from hour to hour and does not always coincide with demand.
- Electricity can barely be stored at grid scale, so generation and consumption must move together.
- Exactly in balance means a frequency of 50 hertz.
- A large deviation from 50 hertz can lead to power outages.
- TenneT guards the balance and activates reserve capacity when it threatens to go wrong.
Why is the grid filling up, and what does your business notice?
Both the consumption and the generation of electricity are growing fast. Heat pumps, charging points and the electrification of production processes raise demand, while solar roofs and wind farms feed a lot back in at peak moments. In more and more places the grid can no longer handle those peaks. This is called grid congestion: the grid is full. For businesses this means that a new connection, or a heavier connection, in a congestion area can end up on a waiting list, because no transport capacity is free. Grid operators are investing heavily in reinforcement, but laying new cables and building stations takes years. Handling your consumption flexibly, for example spreading peaks or storing surpluses, helps you stay within the available capacity.
- Electrification, such as heat pumps and charging points, raises demand for transport capacity.
- Solar and wind feed a lot back in at peak moments, which strains the grid further.
- Grid congestion can lead to waiting lists for a new or heavier connection.
- Flexibility, such as spreading peaks or storing surpluses, eases the pressure on the grid.
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