National Grid (LSE: NG.) shares are often seen as a slow-moving utility play. Recent share price weakness has reinforced that view.

A rising debt burden and higher bond yields have helped fuel the narrative that the sector may not be the most attractive place to park capital right now.

But that view may miss one of the most important structural shifts across electricity grids since they were first built in the 1960s.

And it may be far bigger than the market realises.

A traditional utility under pressure

Higher interest rates have changed how investors value income assets, and utilities have not been immune. As bond yields have risen, they now offer a more direct alternative for income, increasing competition for traditionally defensive sectors.

At the same time, higher financing costs have brought the company’s leverage into sharper focus, reinforcing concerns about balance sheet strength in a higher-rate environment.

Together, these forces have weighed on sentiment, shaping a market narrative that positions the group as a defensive but low-growth utility. Stability is still valued, but long-term upside is increasingly being discounted.

Inflation-linked compounding

This is not the typical equity income story the market often assumes. Operating within a regulated framework provides high earnings visibility and predictable cash generation over time.

Crucially, much of that framework is linked to inflation, with returns and allowed revenues typically adjusted in line with measures such as CPIH. That creates a built-in mechanism for income growth, rather than reliance on cyclical pricing or timing.

This is reinforced by a multi-decade investment cycle, with more than £60bn committed to upgrading and expanding UK and US networks. As the regulated asset base grows, so too does the earnings base, creating a compounding effect over time.

The result is a business that looks less like a static yield vehicle, and more like a long-duration, inflation-linked growth engine.

AI arms race

What is increasingly being overlooked in the National Grid investment case is not cost or regulation, but demand. Electricity demand is no longer a steady, mature-market story — it’s entering a new structural growth phase driven by electrification and AI.

AI data centres are emerging as the fastest-growing sources of power consumption in developed economies.

The direction of travel is clear. Compute-intensive infrastructure requires vast and rising amounts of electricity, much of it concentrated around grid networks.

At the same time, electrification of transport and heating is accelerating. EV adoption, heat pump rollout, and industrial decarbonisation are all shifting energy demand from fossil fuels onto the electricity system.

In that environment, grid capacity becomes the constraint, not the commodity. That is a critical shift. The company sits at the centre of this bottleneck, effectively becoming an enabler of every major energy transition trend.

Rather than diminishing visibility, this extends it. The investment cycle required to expand and reinforce grid networks points to decades of asset base growth, not years. Demand is no longer stable — it is structurally accelerating.

I see National Grid less as a utility and more as critical infrastructure for an electrifying world. If that view proves right, today’s pricing may understate its long-term growth and income potential, which could make it worth considering.