European Power Grids: Strengthening Reliability through Smarter Infrastructure

Europe's electricity networks are in a process of structural change, due to increasing electricity demand in transport, industry and buildings as well as the increasing decentralisation of electricity production. The bulk of electricity use was sourced from large power stations via transmission lines and distributed through local power networks. The flow of electricity was primarily from large power stations via transmission lines to local power networks.

The system is more dynamic due to wind farms, rooftop solar installations, battery storage, and flexible consumer demand. The electricity transmission and distribution must now be carefully coordinated, both with regard to the long-distance transmission of power and the local delivery. Network operators need to ensure a reliable supply while adapting to a changing generation mix, dealing with congestion and getting ready for the increased electrification of the economy.

Changing Priorities Across Europe's Electricity Networks

The rapid growth of renewables is influencing the design and operation of transmission infrastructure. Coastal or offshore areas may provide the most wind resources, whereas significant demand centres can be a long distance from wind generation locations. Solar capacity can be built in areas of varying network conditions, increasing the variability in power flows. Transmission operators need to develop links between the generation zones and centres of consumption. In addition to the amount of electricity that can be transported on a grid, planning now takes into account how fast electricity can flow when the weather changes.

Another related transformation is occurring in distribution networks as rooftop solar panels, electric vehicle charging stations, and battery systems are integrated into homes, commercial buildings, and industrial facilities. Some customers are no longer consumed by the electricity grid but are actively fed into it, or adjust consumption based on the grid conditions. There is a need for distribution operators to have a greater visibility of local demand and generation to control voltage, avoid overloaded generation and maintain the quality of service.

The changing of demand patterns is also due to electrification. Charging infrastructure is being rolled out by transport operators, and new technologies in the industry are being looked at to cut reliance on fossil fuels, such as electric heating. Clusters of fast vehicle chargers can introduce concentrated demands on distribution equipment, and the use of heat pumps can result in higher consumption when electricity demand is high. Predicting the growth of demand and determining if the existing substations, cables and transformers can meet the demand is a task for the network operators.

Resolving Network Constraints Through Better Planning

When electricity generation and demand are separated from each other, grid congestion is a significant problem. Renewable electricity could be available in a location, but transmission capacity prevents delivery elsewhere. New lines can resolve the constraint, while large-scale infrastructure investments involve long and complex multi-jurisdictional planning and environmental assessment. Existing assets can be better utilised by using dynamic line rating where appropriate, upgrading selected assets and improving network monitoring.

The ageing infrastructure needs a similar balance of solutions. Older cables, transformers, and substations might still be working, but require more careful maintenance with the increased variability of electricity flows. Replacing all assets would be expensive and disruptive. Operators can choose to prioritise work based on condition, criticality, and consequences of failure. Condition-based maintenance, thermal monitoring and targeted refurbishment can provide for an increased useful service life and minimise unexpected outages.

Linking renewable projects and new electricity consumers to the grid can be a complex approval process. Developers may be unsure about connection charges, capacity and efforts required to strengthen local networks. Distribution and transmission operators can help the process by providing greater clarity on available capacity, coordinating connection studies and providing technical requirements information at an early stage.

Creating Value Through Smarter Grid Investment

Flexible demand and energy storage provide opportunities to utilise network capacity more efficiently. Surplus electricity can be stored in batteries and delivered when needed. Industrial users and commercial buildings can also choose to time their activities for periods when the grid is less stressed. Demand response can help shave peaks that would otherwise need reinforcement of the network at great cost. Operators require participation rules to be transparent, measurement and compensation to be accurate and to align with the services provided, for flexibility to provide reliable benefits.

Another crucial aspect of Europe's electricity grid is the interconnectors. Linkages across countries enable power to flow across borders, promote trade, and help to balance differentials in power generation and consumption. If one area has a lot of wind or solar production, then it can sell electricity to another area with a more constrained supply. The benefits of the stronger interconnection are determined by available capacity, coordinated market arrangements and domestic network conditions, and it will enhance system resilience. The analysis of the new connections should take into account the interaction with the internal transmission constraints, and should not be analysed in isolation.

A combination of physical investment, flexible operations, and effective regional coordination will be necessary for the direction of electricity transmission and distribution services. Renewable energy sources and demand should be better integrated, and new transmission corridors are required in those regions, while local grids must be upgraded to integrate electrification. The effectiveness of investment in reliable service is affected by various factors, including regulators, network operators, energy producers and consumers.