{"id":21780,"date":"2026-05-06T13:09:51","date_gmt":"2026-05-06T17:09:51","guid":{"rendered":"https:\/\/aecom.com\/blog\/?p=21780"},"modified":"2026-05-06T13:09:53","modified_gmt":"2026-05-06T17:09:53","slug":"why-an-integrated-energy-network-not-renewable-generation-is-the-next-challenge-for-scotland","status":"publish","type":"post","link":"https:\/\/aecom.com\/blog\/why-an-integrated-energy-network-not-renewable-generation-is-the-next-challenge-for-scotland\/","title":{"rendered":"Why an integrated energy network, not renewable generation, is the next challenge for Scotland"},"content":{"rendered":"\n

Scotland has become a leader in renewable electricity generation, <\/em>generating record renewable energy output<\/em><\/a>, but that success is creating new pressures on the system.<\/em><\/p>\n\n\n\n

As the All-Energy conference returns to Glasgow this May, the focus is shifting to how generation, grid and storage can work together to ensure that energy can be used, moved and managed at scale.<\/em><\/p>\n\n\n\n

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Scotland\u2019s renewable electricity capacity and generation have grown substantially over the past decade. Strong wind resources, sustained investment in onshore generation and the rapid expansion of offshore wind have propelled clean power from the margins to the mainstream.<\/p>\n\n\n\n

In recent years, it has generated the equivalent of more than its total electricity demand from renewables<\/a>, exporting surplus power south and supporting security of supply across Great Britain.<\/p>\n\n\n\n

That achievement is now well embedded. But it has also brought Scotland to a new and more difficult point in its energy transition \u2013 one where progress is no longer constrained by the ability to generate clean electricity, but by the system that must carry, store and use it.<\/p>\n\n\n\n

At times of high wind, Scotland produces more electricity than can be consumed locally or transmitted to where demand exists. When that happens, turbines are curtailed or switched off \u2013 not because the energy is not needed, but because the system cannot absorb it.<\/p>\n\n\n\n

In 2025 alone, more than 10 terawatt hours of renewable electricity was curtailed in Scotland<\/a> \u2013 enough to power every Scottish household for a year.<\/p>\n\n\n\n

This is no longer a one-off issue, but something the system is encountering more frequently as it comes under strain. When output is reduced in this way, generators are compensated, while other plants elsewhere are often paid to ramp up supply to balance the system \u2013 with the cost ultimately borne by consumers.<\/p>\n\n\n\n

As renewable capacity continues to grow faster than transmission and storage, constraint costs are rising and are expected to increase further as this gap persists.<\/a><\/p>\n\n\n\n

The same bottlenecks are now shaping how projects are delivered. Connecting new infrastructure \u2013 whether onshore wind, offshore wind, grid-scale storage or electrified industrial demand \u2013 is becoming more complex and time-consuming<\/a>.<\/p>\n\n\n\n

In parts of Scotland, projects that are technically viable and commercially backed are facing significant delays in securing grid connections<\/a>, in some cases waiting years for a confirmed date to connect.<\/p>\n\n\n\n

For developers, this uncertainty raises costs and delays delivery. For the system, it risks slowing deployment needed to meet net-zero targets just as pace matters most.<\/p>\n\n\n\n

At its core, the challenge is clear. Renewable generation is variable by nature, while demand follows a different pattern. Without sufficient flexibility, high output periods overwhelm the grid, and with few storage options available, the energy has nowhere to go.<\/p>\n\n\n\n

This is why storage \u2013 particularly long\u2011duration storage \u2013 is moving from a supporting role to a central one. While shorter-duration solutions can help manage short-term fluctuations, they do little to address multi\u2011hour or multi\u2011day mismatches between supply and demand.<\/p>\n\n\n\n

Pumped storage hydropower<\/a> (PSH), by contrast, can absorb large volumes of surplus electricity and release it when demand increases \u2013 reducing wasted energy, lowering system costs and improving resilience.<\/p>\n\n\n\n

Scotland is particularly well placed to deliver this at scale. Its mountainous terrain, existing hydro infrastructure and high levels of wind generation make it well suited to developing long-duration storage. However, delivery has not yet kept pace with system need, reflecting the complexity and timescales involved.<\/p>\n\n\n\n

What is becoming increasingly clear is that no single intervention will resolve these challenges. Renewable generation, storage and grid infrastructure each play a distinct role, but their value depends entirely on how they function together.<\/p>\n\n\n\n

Without storage, surplus power cannot be captured. Without grid capacity, it cannot be moved to where demand exists. Without coordination, the system cannot respond efficiently to change. The risk is a network that grows more complex, more expensive and less effective with every additional gigawatt of generation added.<\/p>\n\n\n\n

In Scotland, pumped storage schemes such as Loch na Cathrach, near Inverness, and Balliemeanoch in Argyll are being developed to address the growing mismatch between supply and demand. As one of the few proven long-duration storage technologies at this scale, pumped storage has a key role to play in supporting a more flexible and resilient system.<\/p>\n\n\n\n

At Balliemeanoch, for example, the proposed scheme could provide up to 900 megawatts of generation capacity and around 13,050 megawatt hours of storage, enabling it to store significant volumes of excess energy and respond quickly to changes in system demand.<\/p>\n\n\n\n

Our involvement in these projects spans engineering, environmental assessment and planning, working across disciplines from an early stage to shape projects that are both deliverable and aligned with system needs. This includes navigating consenting requirements in sensitive locations and ensuring storage is designed and positioned to work effectively with the existing grid.<\/p>\n\n\n\n

Grid infrastructure remains critical. Without sufficient capacity to connect and transmit electricity, even well-designed generation and storage projects cannot perform as intended. Through our work on programmes such as the Great Grid Upgrade<\/a>, we are supporting the upgrades needed to unlock that capacity and improve connectivity across the network.<\/p>\n\n\n\n

Scotland\u2019s renewable success has laid strong foundations, but the next phase will be defined by how effectively the system can support it. This is no longer just about building more generation \u2013 it is about ensuring the system can make full use of it.<\/p>\n\n\n\n

When output is high, power needs to be moved to where it is needed or stored until it can be used. Without that capability, clean energy is lost, costs increase and the system becomes harder to manage. Getting this right will be critical to maintaining reliability, improving resilience and ensuring consumers see the full benefit of low-cost renewable power.<\/p>\n\n\n\n

If Scotland can deliver this, it will show what a renewable energy system looks like in practice \u2013 one that can use the power it produces, respond to changes in supply and demand, and deliver reliable, affordable energy at scale. <\/p>\n\n\n\n

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Join us at All-Ener<\/em><\/strong>gy 2026 in Glasgow this May to hear David speak about how private wire and behind<\/em><\/strong>\u2011the<\/em><\/strong>\u2011meter solutions can accelerate project delivery and support campus decarbonisation. The session takes place on Wednesday 13 May from 09.45\u2013 10.15 at the Future Talent Show Floor Theatre, SEC.<\/em><\/strong><\/p>\n\n\n\n

For more details and to register, visit the All-Energy website<\/em><\/strong><\/a>.<\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

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