The modular building blocks for our future cities

Cities may be humanity’s greatest invention, generating economic and cultural impact far beyond their boundaries.

As global urbanisation accelerates, the importance of metropolises will continue to grow, but so too will the pressures they face. Ageing infrastructure, constrained public budgets, and ambitious decarbonisation targets create urgent challenges.

While high-profile proposals often emphasise transformative, futuristic infrastructure, large-scale overhauls are costly, complex, and time-consuming.

For most cities, the practical and investable path lies in incremental, modular upgrades; interventions that enhance reliability, resilience, and sustainability while accommodating growing urban populations.

The urban challenge

Today, 58% of the global population lives in urban areas, a figure projected to rise by another 10% by 2050, bringing hundreds of millions more residents into cities and intensifying demand on energy, water, and transport systems.

Infrastructure pressures are already evident: a US study of 277 urban areas predicts electricity demand intensity will rise 12–26% by 2050 relative to 2010–19, while global urban water demand is expected to double. In the UK, a £104bn plan targets water leaks and sewer spills, while Australia aims to double water utility investment by 2027.

Read more: Investing in sustainable cities

Urban transport is similarly capital-intensive: London alone has committed £5.4 billion to modernising its oldest Underground lines, which serve over 1 billion passengers annually.

Decarbonisation ambitions amplify these requirements. The International Energy Agency estimates global electricity grids will require ~$600bn annually to meet net zero goals and rising demand, much of it concentrated in urban nodes.

At the same time, retroactively addressing climate-related infrastructure damage is far costlier: in 2025, global natural disaster losses reached $224bn, less than half of which were insured. Delivery is further complicated by permitting delays, supply chain inefficiencies, and skilled labour shortages, even as public finances remain tight.

Incremental Solutions: Energy, water & mobility

Despite these challenges, incremental interventions can improve urban infrastructure while offering scalable investment opportunities.

Distributed Energy Resources (DER) can enhance grid resilience. Behind-the-meter storage can reduce peak demand; solar PV plus battery systems smooth supply-demand mismatches; and virtual power plants aggregate small assets to deliver dispatchable capacity. DER enables consumers to become “prosumers,” producing, storing, and flexing their energy use.

Demand-side response (DSR) provides an elegant, scalable solution. By temporarily reducing consumption across buildings and industrial sites, DSR balances supply and demand, mitigates grid congestion, and decreases reliance on expensive peaker plants. Voltalis, a European leader, has connected over 1.5 million DSR devices across eight countries.

Battery Energy Storage Systems (BESS) complement DSR, storing excess power for peak periods and reducing megaproject risk. In Europe, BESS capacity reached 61.1 GWh in 2024, with growth expected to nearly double by 2029.

Urban water systems face mounting demand: in the UK, supply is projected to fall short by 25% by 2050, with approximately 20% of water lost to leakage.

Smart meters and digital monitoring systems enable real-time leak detection, support household consumption awareness, and help regulators enforce reductions. These incremental improvements are low-cost, high-impact interventions that enhance system efficiency and resilience.

Cities are rethinking mobility to prioritise safety, inclusion, and sustainability. Strategies focus on multimodal integration, walking and cycling, and electrification.

Copenhagen offers a model: dedicated bike lanes, “superhighways,” and bike hubs integrated with public transport enabled cycling to account for nearly 50% of commuting trips by 2023. Operators such as Inurba Mobility are scaling technology-enabled cycling and micro-mobility solutions across Europe and Latin America.

Building the new reality

Incremental infrastructure upgrades present a compelling investment opportunity. Public authorities often lack the capacity to deliver at the pace required, creating space for private capital, particularly long-term institutional investors such as pension funds.

These projects offer many features of traditional infrastructure: essential service provision, predictable demand, and long-term, inflation-linked cash flows. Cross-sector integration – energy, water, mobility – supports portfolio diversification and alignment with ESG objectives, including climate resilience and social inclusion.

Institutional investors can apply expertise in capital structuring, multi-sector coordination, and long-term stewardship to finance urban upgrades that modernise cities without relying on high-risk megaprojects. By providing patient, disciplined capital with downside protections, investors can enable cities to become more resilient, adaptive, and economically productive.

Cities are engines of change. Focusing on incremental, data-informed interventions across energy, water, and mobility allows investors to support urbanisation management while capturing stable, long-term returns. Well-structured, principled capital can help cities meet the dual pressures of ageing infrastructure and decarbonisation, ultimately building resilient, investable metropolises for the future.