Interconnector

An interconnector is a vital piece of energy infrastructure. It is a structure that allows electricity to move between different grids. These grids are networks that manage the power for specific regions or countries. In the United States, these systems are often called a DC tie. Interconnectors specifically enable high-voltage direct current (HVDC) electricity to flow between networks. This can connect separate alternating current (AC) networks. It can also link synchronous grids together. By connecting these systems, we create a much more reliable way to distribute power across large distances.

These connections work through several different physical methods. Engineers design them to cross various types of terrain. Some interconnectors consist of overhead power lines that hang in the air. Others are made of underground power cables buried beneath the earth. When two land areas are separated by water, engineers use submarine power cables. These cables sit on the floor of the ocean to link distant coasts. This variety of methods allows electricity to travel across land borders or through the sea.

The primary mechanism of an interconnector is the movement of surplus energy. When one territory generates more electricity than it requires, it has a surplus. This extra energy can be sold to a neighboring territory through the interconnector. This process allows for the active trading of electricity between different regions. For example, the East–West Interconnector facilitates this type of trading between Great Britain and Ireland.

This movement of power helps balance the needs of different areas. It ensures that energy is used where it is most needed at any given time.

Interconnectors provide essential security of supply and increased resilience. They help manage peak demand, which is when electricity usage is at its highest. By linking grids, a region can draw on power from its neighbors during these busy times. This is why the Nordic and Baltic energy exchange, known as Nord Pool Spot, relies on multiple interconnectors. In the European Union, there is a movement toward a single market for energy. This goal makes the use of interconnectors even more viable for many nations. Some planners even propose a European super grid. This would include many interconnectors linking various national networks together.

These structures are also key to integrating renewable energy into our power systems. Many HVDC lines are used to transfer power from sources like wind and hydro. Because renewable energy can be variable, interconnectors help move that power to where it is needed. This helps reduce the reliance on fossil fuel power plants. As a result, the use of these links can help reduce harmful emissions. Interconnectors also help societies adapt to changing patterns, such as the rise of electric vehicles. They provide the infrastructure needed to handle new types of electricity demand.

Global projects demonstrate the massive scale of these systems. As of July 2022, there were at least 35 international connectors in existence. The Hami-Zhengzhou interconnection is one of the longest recorded examples. It delivers 8 GW of high-voltage direct current power.

Another massive project is the proposed Xlinks Morocco-UK Power Project. This project aims to carry 3.6 GW of power. These large numbers show how much energy these links can move to support entire populations.

While many regions are well-connected, others still face challenges. In many parts of the world, there is a lack of sufficient interconnectors. Building more of these links could create more efficient, regionally integrated electricity systems. This would allow for a greater share of renewable energy to be used globally. The ASEAN region is one example of a place that could benefit from more connections. By building more infrastructure, we can create a more stable and clean energy future for everyone.