The Fall of Liberalisation in the UK Energy Market

A Defining Moment in the UK Domestic Energy Market

The UK domestic energy market has entered a new phase. The recent consolidation, E.ON’s acquisition of OVO’s retail customer base, represents more than a commercial transaction; it marks a structural shift in how the market operates and how risk is managed.

For over two decades, the UK pursued liberalisation as a mechanism to:

• Increase competition
• Lower consumer costs
• Improve service standards.

However, recent events suggest a turning point. The collapse of multiple suppliers during the 2021 energy crisis, combined with extensive regulatory reform, has fundamentally reshaped the market.

This article explores what that transition means, not from a short-term or reactive standpoint, but through a longer-term, practical lens. More importantly, it considers where the opportunity now lies for consumers and organisations operating in this new landscape.

From Liberalisation to Consolidation – What Changed?

The UK energy market liberalisation model, introduced following privatisation in the late 1990s, focused on competition as the central driver of value.

By the late 2010s:

• The “Big Six” share of the market had reduced significantly
• New entrants such as OVO, Octopus and Bulb expanded rapidly
• Consumers benefited from tariff competition and switching (driven by the online switching sites).

However, this model came with structural weaknesses.

The 2021 Energy Crisis – A Stress Test the Market Failed

The 2021 energy crisis exposed several systemic risks:

• Wholesale gas prices increased dramatically
• Many suppliers lacked sufficient hedging strategies
• Capital requirements were minimal
• Customer deposits were often used as working capital.

Between July 2021 and May 2022:

• 29 UK energy suppliers failed, removing more than half of the competitive market.

The collapse of Bulb Energy alone led to:

• Estimated gross government support of approximately £3.02 billion, according to the National Audit Office.

This was not simply a failure of individual suppliers. It was a failure of market structure.

Ofgem’s Structural Reset – A Necessary Evolution

The UK energy regulator Ofgem has since implemented a series of reforms that fundamentally change how the market operates.

Key Structural Changes

Capital Requirements
From March 2025, suppliers must maintain a defined capital buffer, including a target of approximately £115 per domestic dual-fuel customer.

Ringfencing of Customer Credit Balances
Customer funds must now be protected and separated from operational cash flow.

Renewables Obligation (RO) Ringfencing
Environmental levy funds must be held in protected structures.

Supplier of Last Resort (SoLR) Reform
Costs associated with supplier failure are now recovered from insolvency processes rather than passed directly to consumers and organisations.

These changes reflect a clear shift:

• From competition-first policy
• To resilience-first regulation.

The Emergence of a New Market Structure

Following consolidation, the UK domestic energy market is now dominated again by a smaller number of large suppliers.

UK Domestic Energy Market (Post Consolidation)

The resulting structure resembles a renewed concentration, with five major players collectively controlling the majority of the market.

This is not a regression. It is a rebalancing.

Why Scale Now Matters

The modern energy retail market has become:

• More capital intensive
• More regulated
• More dependent on robust risk management
• Required to support Net Zero targets.

Operating successfully now requires:

• Hedging capability
• Strong balance sheets
• Data-driven operational control.

In simple terms, the model of a lightly capitalised challenger supplier is no longer viable at scale.

A Positive Outcome – Stability Over Volatility

While consolidation is often viewed negatively, the current market provides several clear benefits for consumers and organisations.

Improved Financial Resilience

Suppliers are now required to hold sufficient capital to withstand market volatility, reducing the risk of sudden failure.

Protection of Consumer Funds

Ringfencing measures ensure:

• Customer credit balances are safeguarded
• Reduced exposure to supplier insolvency.

Reduced Cost of Failures

Ofgem’s reforms have significantly reduced the cost of supplier collapses passed on to consumers and organisations.

Previously:

• Costs were socialised across bills.

Now:

• Costs are recovered through structured insolvency processes.

This represents a meaningful improvement in consumer protection.

“The UK energy market has not lost competition; it has evolved beyond price-driven competition towards performance-based energy management. For organisations, the real opportunity lies in how effectively they understand and manage their energy use. In a more stable and resilient market, the focus must be on actively controlling consumption, improving data quality, and making informed, long-term decisions that support both cost management and Net Zero objectives.”
— Graham Paul, Service Delivery Director, TEAM Energy

From Domestic Market Change to Organisational Impact

While these changes have taken place in the domestic supply market, their implications extend well beyond households.

For organisations, particularly those managing complex estates or large energy portfolios, the shift from liberalisation to a more regulated and consolidated market fundamentally changes how energy should be approached.

The era of relying on supplier switching, tariff competition and short-term pricing advantage is giving way to a model where stability, data accuracy, decarbonisation and long-term performance are just as important.

This is where the domestic and business energy markets begin to converge – not in how energy is purchased, but in how it must now be managed.

What This Means for Consumers and Organisations – A Different Value Equation

The definition of “value” in the energy market is changing.

Historically, value was associated with:

• Lowest tariff
• Frequent switching
• Price-driven competition.

Today, value is increasingly linked to:

• Stability
• Transparency
• Data accuracy
• Long-term cost management
• Net Zero.

This is a fundamental shift.

The Role of Data – A More Informed Energy User

One of the most important consequences of market maturity is the increased importance of data.

Consumers and organisations now require:

• Clear visibility of consumption based on time of day
• Accurate billing and validation
• Insight into usage patterns.

This is where UK energy management becomes critical. Increasingly, organisations also need to understand and report the carbon footprint associated with their energy consumption, not just the cost. Linking energy usage data to emissions enables businesses to quantify their environmental impact, support regulatory reporting requirements such as SECR, and make more informed decisions aligned to Net Zero objectives.

Why Energy Management Now Sits at the Centre of Consumer and Organisational Value

As the market consolidates, the opportunity for savings is no longer driven purely by:

• Switching supplier
• Accessing marginal tariff differences.

Instead, value is driven by:

• Understanding consumption
• Identifying inefficiencies
• Making informed consumption and carbon decisions.

This is the domain of energy management solutions, supported by smart metering and industry reforms such as the Market-wide Half-Hourly Settlement (MHHS) programme.

From Price Competition to Performance Management

The shift from liberalisation to regulation signals a deeper transformation:

From:

• Price-driven behaviour.

To:

• Performance and carbon-driven energy management.

For organisations, this means:

• Energy is no longer a transactional cost
• It becomes a managed operational input and carbon footprint
• Energy efficiency is the first opportunity for cost reduction.

This is particularly relevant for:

• Public sector estates
• Multi-site organisations
• Energy-intensive industries.

Written by Graham Paul – Service Delivery Director

With over twenty years of experience in the energy sector, Graham leads service delivery, sales and marketing to enhance customer experience and scale TEAM’s carbon and energy services with a data-driven, outcomes focus.