Making the grid ready for what comes next

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Wind farms, solar parks and new hydrogen projects are appearing at impressive speed, but many of them run into a familiar problem: the grid cannot keep up. Projects wait in line for a connection, existing lines already run close to what they can safely handle and every new corridor is a slow negotiation over space and impact. In practice, the bottleneck has shifted from designing turbines and panels to something much less visible: the towers and cables that are supposed to carry their power.

Recent analysis from the International Energy Agency (IEA) underlines the scale of the challenge. To fully support the shift to renewables, the world will need to roughly double today’s grids in the next two decades.  In Europe, industry estimates suggest that by 2030 a large share of low voltage lines will have reached the end of their expected lifetime and will need attention to avoid becoming a bottleneck.

This is where advances in the steel and wire inside overhead lines, subsea cables and hydrogen systems really start to matter.

Power networks were built for a more predictable world. Large thermal plants supplied electricity along relatively short paths to consumers, and load patterns changed slowly. Now, renewable generation is often located far from demand centers, and weather conditions cause rapid swings in output. At the same time, many assets built in the 1960s–1980s are simply aging. Renewable power is growing fast, but it still has to travel over infrastructure that was built for a very different, much ‘grayer’ energy system.

Expanding capacity is not just a matter of building more lines. New rights‑of‑way are difficult to secure, and full rebuilds are disruptive and expensive. This is where materials and design choices, down to the properties of the steel wire inside cables and conductors, can create room to maneuver.

One way to increase capacity without expanding the footprint of overhead lines is to upgrade the conductor design. High‑tensile steel wire cores are designed to operate at higher temperatures and withstand higher mechanical loads than conventional cores, while remaining compatible with existing tower designs and fittings.

By combining higher strength with carefully controlled thermal and mechanical behavior of the whole conductor, power lines can carry more current in the same corridor. They help limit sag under high temperatures and heavy ice or wind loads, supporting both safety clearances and reliability. In practice, this often means that an existing line can be reconductored to increase its capacity instead of building a new parallel line.

In challenging environments such as long fjord crossings or mountainous terrain, these properties become even more important. Long spans and harsh weather put extreme demands on conductors and support structures. High‑tensile steel cores offer an industry-proven and robust solution to manage those loads while keeping the number of towers and foundations under control. 

The energy transition is often discussed in terms of gigawatts of new generation capacity, but the wires that support the energy infrastructure are just as important. By making careful choices about the reinforcements inside conductors and cables, utilities can unlock additional capacity in existing infrastructure, minimize new corridor development, and sustain reliable operation under evolving climate conditions. In the end, increasing grid capacity is not only about building more lines; it is about designing smarter, more resilient networks from the inside out.