The UK’s energy system is being rebuilt and grid reinforcement, renewable integration and accelerating electrification are reshaping what sits behind the electricity bill. An increasing share of cost is now driven by regulated, infrastructure-linked charges that are rising steadily as the system modernises. 

For organisations exploring or investing in on-site solar, this shift changes the strategic context. Solar can reduce exposure to wholesale price swings and help meet sustainability targets but now has an increasing role to play in reshaping how much electricity is imported from the grid, and therefore how much of that evolving cost structure an organisation is exposed to. 

In this three-part series, we examine how non-commodity electricity costs are transforming the financial landscape, what that means for the long-term case for on-site generation, and how organisations can design a more resilient and commercially grounded energy strategy. 

PART ONE | PART TWO| PART THREE

Going beyond unit price: why fixed energy costs are reshaping the case for solar

The word volatility has dominated the energy landscape for the past few years. Between 2021 and 2023, wholesale electricity prices jumped to levels few organisations were prepared for, with UK non-domestic electrcity prices rising by more than 90% over the period, as the energy crisis unfolded (source: UK Office for National Statistics (ONS), The impact of higher energy costs on UK businesses, 2025).  

Wholesale markets may have retreated from the extraordinary peaks of the energy crisis, but the situation in the Middle East means they are far from stable and prices remain well above pre-crisis levels. Yet before the current crisis even started, many businesses were still asking the same question: as and when wholesale prices ease, why doesn’t the overall electricity bill fall in line? 

The answer sits in the part of the bill that rarely receives the same scrutiny as the unit rate – non-commodity costs. 

Shifting from volatility to structural inflation 

Historically, the wholesale cost of electricity made up the lion’s share of a commercial energy bill, often in the region of 60 to 70 percent of total cost. This meant a well-structured energy procurement strategy could meaningfully control overall spend. 

Now, that balance is changing, and an increasing share of the electricity bill now comes from non-commodity elements that include: 

– Transmission and distribution network charges
– System balancing costs
– Capacity market charges
– Policy and regulatory levies

In many cases, these components now represent half or more of the total electricity cost. And unlike wholesale prices, these costs are not driven by global fuel markets or short-term supply shocks. They are driven by something far more structural: the transformation of the UK energy system itself. 

The grid was built for a different era that was defined by centralised fossil fuel generation and predictable demand patterns. Today, it must accommodate a far more complex structure that includes decentralised renewables, rising demand through electrification across transport, heating and industry, and two-way power flows (where organisations not only import energy from the grid but export it back too). 

This infrastructure requires significant long-term investment to reinforce and modernise it, the cost of which is recovered through the regulated and policy-driven charges embedded in electricity bills. 

In effect, we are moving from an era of commodity volatility to one of structural inflation. 

Why this matters for electricity-intensive businesses 

For organisations increasing their reliance on electricity, as driven by the energy transition itself, exposure to these structural fixed energy costs is growing. 

Electrification is accelerating across sectors as fleets are transitioning to electric vehicles, heat pumps are replacing gas systems, and everyone from manufacturing firms to and logistics operations are shifting processes toward electricity to support decarbonisation. 

Every one of these changes increases demand on the grid, and the more dependent your organisation becomes on imported electricity, the more exposed you are to the rising cost of maintaining and expanding the infrastructure that delivers it. 

This is a fundamental shift in cost structure, which changes how the business case for on-site generation should be evaluated. 

The power of solar

Traditionally, commercial solar projects have often been justified on two primary grounds: 

– Reducing exposure to wholesale electricity price volatility – by generating some or all your electricity requirements on-site,
– Demonstrating visible progress toward sustainability goals.

Both remain relevant, but there is a bigger opportunity. In a market where non-commodity costs represent a growing share of total cost, the value of solar extends beyond simply offsetting the unit rate. On-site solar reduces the volume of electricity imported from the grid, and by doing so, it reduces exposure to certain variable non-commodity costs associated with that imported power. 

It also provides long-term cost visibility, as once installed, the cost of generating electricity on-site is largely fixed and predictable. Over a 20-to-30-year asset life, this stability will become increasingly valuable in a system that is defined by rising regulated charges. 

Solar is a tool to manage volatility and to manage structural exposure. It won’t eliminate non-commodity costs entirely, but it can reduce exposure to the elements of the bill that are rising fastest. 

Preparing for what comes next

Understanding what sits behind the electricity bill is now essential for informed decision-making. Wholesale prices will continue to fluctuate, but alongside that is the continuing story of grid transformation and the rising cost of funding it. 

Solar can go beyond sustainability credentials and unit savings, to help reframe your organisation’s electricity consumption and exposure to non-commodity costs, in an energy system that is evolving rapidly. 

In part two of this series, we will go further behind the bill and look at which non-commodity elements solar can influence, how storage enhances that control, and why on-site generation and energy strategy need to be designed together.