As AI, electrification and renewable power reshape demand, transmission infrastructure has become the defining constraint, and one of the most urgent investment opportunities in the global energy transition.
The energy transition has often been framed as a question of generation: how quickly economies can build enough wind farms, solar projects, batteries and low-carbon power assets to displace higher-emitting sources of energy. However, increasingly, the transition will be won or lost not by how much clean power can be produced, but by whether grids can move that power reliably, affordably and at scale.
The bottleneck is no longer capital or generation capacity. It is grid transmission.
The grid becomes the system constraint
“One of the most telling figures today is the 2,500 gigawatts of power waiting in queues for transmission capacity,” said Kieran Douglas, Head of Energy, Power and Resources at Mizuho. “This tells you where the bottleneck is. It’s not power and energy generation – it’s the wires.”
As the bottleneck shifts from generation to grids, investment will need to rise by around 50% by 2030 from roughly USD 400 billion today. The ability to connect capital with complex infrastructure needs is becoming one of the defining capabilities of the next phase of the transition.
The question is no longer only where new generation can be built. It is where energy systems can be reinforced, connected and made flexible enough to support the next wave of demand.
“Grid infrastructure is critical,” said Douglas. “Across the UK, Europe and globally, we need to develop and upgrade grid infrastructure, pipeline infrastructure and the broader systems that support energy flows.”
Infrastructure, transition and strategic finance have often been viewed as separate stories. At Mizuho, they are viewed as deeply interconnected.
AI is accelerating the pressure on power systems
The rise of AI and data centres is intensifying this pressure. Digital infrastructure can be financed and built quickly, but the energy systems needed to power it often move on much longer planning cycles. That mismatch is already becoming a critical consideration for investors, developers and governments.
“The pace of data centre growth is accelerating beyond the pace at which new power infrastructure is being built,” said James Knight, Managing Partner of Augusta & Co, Mizuho. “The requirements are fairly consistent everywhere: access to reliable power, proximity to generation, security of supply and sufficient scale.”
In practical terms, AI infrastructure is becoming inseparable from energy infrastructure. Data centres need reliable and increasingly low-carbon power. Renewable generation needs storage and grid access. Networks need capital, planning certainty and new commercial structures. Every part of the system now depends on the others.
“When regulators and utilities were setting investment plans several years ago, they weren’t necessarily forecasting the scale of AI-related demand we’re now seeing,” said Douglas. “Companies are having to revisit investment plans and seek additional capital to accelerate network upgrades.”
Capital is available but it must be matched to the right risk
Investor appetite is clearly moving in the right direction. Global energy investment is expected to reach USD 3.4 trillion in 2026, according to the International Energy Agency, with electricity-related spending already representing nearly 60% of total energy investment. Clean energy investment continues to outpace fossil fuel investment, reinforcing the direction of travel for capital markets.
“There is no shortage of capital,” said Dolly Meena, who leads energy infrastructure and transition M&A at Mizuho Greenhill London. “The challenge is matching the right opportunities with the right capital.”
Mizuho’s strength: connecting capital, sectors and geographies
This is where Mizuho plays a distinctive role. The infrastructure challenge increasingly sits at the intersection of energy, digital infrastructure, capital markets, regulation, geopolitics and cross-border investor flows. Addressing it requires more than lending capacity alone; it requires integrated advice across the full capital structure and across regions.
“Mizuho has evolved from being viewed primarily as a lending powerhouse into something much broader,” said Salvatore Ciccarelli, Head of Infrastructure & Advisory for EMEA at Mizuho. “We are building a fully integrated team across infrastructure asset classes, combining balance sheet strength, strategic advisory capability and specialist expertise.”
That integrated model is especially relevant as investors from Asia and the Middle East become more active in UK and European infrastructure, alongside the growing role of Middle Eastern funds as investors diversify beyond traditional hydrocarbon exposure.
Through the acquisitions of Greenhill and Augusta & Co, Mizuho has strengthened its platform in recent years. Describing Augusta as one of Europe’s leading independent renewable energy and energy transition financial advisory firms, Knight noted that its integration into Mizuho reflects both the importance of the sector and the increasing globalisation of renewable energy finance.
“Today, we operate in a pan-European market accessing global pools of capital,” said Knight. “Capital is abundant. Capital is sophisticated. Capital is mobile. The challenge isn’t finding capital. The challenge is understanding how to deploy it effectively."
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