What Is SSES? Understanding the UK's Smart Secure Electricity Systems Programme

Sat, 20 Jun 2026 00:39:10 GMT

How Smart Secure Electricity Systems Could Transform the UK's Electricity Network

Millions of electric vehicles, heat pumps, batteries and smart energy technologies are expected to connect to the UK's electricity network over the coming decades. Smart Secure Electricity Systems (SSES) is the Government's strategy for ensuring the electricity system can remain flexible, reliable and secure as this transition takes place.

Smart Secure Electricity Systems (SSES) is a UK Government programme designed to help make the UK's electricity system more flexible, efficient and secure.

Rather than simply generating more electricity whenever demand increases, SSES allows compatible appliances to communicate with the wider energy system and receive signals about grid conditions, electricity demand, renewable energy availability and flexibility requirements.

These appliances can then adjust when they operate in response to those signals, helping shift some electricity use away from busy periods and towards times when the grid is quieter, electricity is cleaner or renewable energy is more readily available.

This approach is often referred to as Consumer-Led Flexibility (CLF), where households are rewarded for allowing compatible appliances to use electricity in ways that support the wider energy network.

When homes help support the electricity network in this way, energy suppliers can reduce costs and may pass some of those savings back to consumers through lower-cost tariffs, flexibility payments and other incentives.

The result is a system that benefits the electricity grid, energy suppliers, consumers and the wider economy.

The programme is still in development, and how it is implemented will continue to evolve over time.

Why This Matters

SSES is not simply about helping households access cheaper electricity.

Its primary purpose is to help balance the UK's electricity network as demand grows and renewable energy generation increases.

Government publications have highlighted potential savings from flexible electricity use. For example, households that avoid peak electricity periods could save over £200 per year on certain smart tariffs, while households with heat pumps may save more than £250 annually and EV owners could save around £330 per year through smart charging, depending on their circumstances and the tariffs available. (Source: DESNZ, Smart Secure Electricity Systems Programme Consultation and Clean Flexibility Roadmap)

What This Article Covers

What Smart Secure Electricity Systems (SSES) are
Why the UK is introducing SSES
How Consumer-Led Flexibility (CLF) works
How the electricity grid, consumers and taxpayers could benefit
What Energy Smart Appliances (ESAs) are
The difference between SSES and smart appliances
What SSES means for consumers, manufacturers and the wider energy system
Frequently asked questions

Understanding the Bigger Picture

Most articles about SSES focus on how households might save money.

While that is certainly one benefit, it is not the primary reason the programme exists.

The real objective is to create a more flexible electricity system that can better cope with changing patterns of electricity generation and demand.

The process works like this:

Step 1: Help the Grid

Compatible appliances can receive signals relating to grid conditions and adjust when they use electricity in ways that help support the wider electricity grid.

This might be when:

Electricity demand is lower
Renewable generation is high
Spare network capacity is available
Grid balancing services are required

Step 2: Reduce System Costs

By spreading electricity demand more evenly throughout the day, the electricity system can operate more efficiently.

This can help reduce:

Peak demand pressures
Network congestion
Balancing costs
Some future infrastructure requirements

Step 3: Reward Consumers

Energy suppliers and flexibility providers can encourage participation through:

Smart tariffs
Time-of-use pricing
Flexibility payments
Other incentives

Consumers are effectively rewarded for helping the electricity system operate more efficiently.

Step 4: Deliver National Benefits

A more flexible electricity system helps:

Support renewable energy
Improve energy security
Reduce overall system costs
Improve use of existing infrastructure
Support long-term decarbonisation goals

This is the wider purpose of SSES.

A Simple Example

Imagine two scenarios:

Traditional System

At 6pm:

Millions of people arrive home
Electric vehicles begin charging
Heat pumps start working harder
Hot water systems switch on
Cooking appliances are used

Demand rises sharply.

The electricity system must respond immediately.

Smart Flexible System

At 6pm:

Some appliances continue operating as normal
Electric vehicles may wait until later
Batteries may discharge stored energy
Hot water systems may heat water overnight
Some loads shift to quieter periods

The same outcome is achieved.

The difference is that electricity demand is spread more evenly.

This is the fundamental principle behind SSES.

Why Does the UK Need SSES?

The UK's electricity system is undergoing one of its biggest transformations in decades.

Historically, electricity generation largely followed demand.

When millions of people switched on appliances at the same time, power stations increased output to match.

Today, the situation is changing.

The UK is seeing rapid growth in:

Electric vehicles
Heat pumps
Home battery storage
Electrified heating systems

At the same time, a growing proportion of electricity is generated from renewable sources such as:

Wind power
Solar power

Renewable generation is excellent for reducing carbon emissions, but it is not always available when demand is highest.

As a result, electricity supply and electricity demand do not always align.

SSES has been developed to help solve this challenge.

For most households, little may change immediately. Existing appliances will continue to operate normally, and participation in flexibility services is expected to be voluntary. The greatest benefits are likely to be available to homes with technologies such as electric vehicles, heat pumps, hot water cylinders and battery storage, where electricity use can be shifted more easily to support the wider energy system.

What Are Energy Smart Appliances?

The appliances that participate in this process are known as Energy Smart Appliances (ESAs). These appliances are the practical mechanism through which Consumer-Led Flexibility is delivered.

Examples include:

Electric vehicle chargers
Heat pumps
Home batteries
Smart heating controls
Smart hot water systems

Future Energy Smart Appliances are expected to follow common interoperability standards designed to help products and services from different manufacturers work together more effectively.

These appliances can respond to signals relating to:

Electricity prices
Grid conditions
Energy availability
Flexibility services

The process happens automatically in the background.

Flexibility signals aren’t sent by government but by energy suppliers, aggregators and the National Energy System Operator, indicating when the grid needs support or when renewable energy is plentiful.

While much of this process is designed to operate automatically, consumers are expected to remain in control.

Many future Energy Smart Appliances may provide access through mobile apps, web portals, home energy management systems (HEMS) or built-in controls, allowing users to view appliance status, adjust preferences, set operating schedules and override automated operation when required.

What Is Consumer-Led Flexibility (CLF)?

Consumer-Led Flexibility (CLF) is one of the key principles behind the Smart Secure Electricity Systems (SSES) programme.

Put simply, it means allowing households and businesses to voluntarily adjust when they use electricity in ways that help support the wider electricity network.

Rather than appliances always using electricity immediately, compatible Energy Smart Appliances will be able to receive information and automatically shift some of their electricity consumption to times when:

Electricity demand is lower
Renewable energy generation is higher
Spare grid capacity is available

This helps the electricity system operate more efficiently while maintaining the same outcome for the consumer.

Examples of Consumer-Led Flexibility

In practice, Consumer-Led Flexibility could include:

An electric vehicle charging at 11pm rather than 6pm
A home battery charging during periods of high wind generation
A heat pump pre-heating a home before peak demand periods
A hot water system heating water overnight when electricity demand is lower

The homeowner still receives the same outcome, but the electricity network benefits from a more balanced demand profile.

In return, energy suppliers may offer lower-cost tariffs, flexibility payments or other incentives to encourage participation.

This is why Consumer-Led Flexibility sits at the heart of the SSES programme. It creates benefits for consumers, energy suppliers and the wider electricity system at the same time.

Why SSES Is Different from Traditional Time-of-Use Tariffs

At first glance, SSES may sound similar to existing tariffs such as Economy 7, where electricity is cheaper at certain times of the day.

However, SSES is much broader.

Traditional tariffs encourage consumers to manually shift electricity use to cheaper periods at set times of day.

SSES aims to allow compatible appliances to receive signals relating to real-time electricity system conditions, renewable energy availability and flexibility services, and automatically respond to those signals without requiring ongoing intervention from the consumer.

In addition to benefiting from lower-cost electricity periods, participating households may also be able to access flexibility payments, supplier incentives and future smart energy services designed to reward behaviour that supports the wider electricity network.

As a result, the potential financial benefits could be greater than those available through traditional time-of-use tariffs alone, although this will depend on the tariffs, technologies and flexibility services available.

In simple terms:

Economy 7 changes the price, by encouraging consumers to use electricity during pre-defined off-peak periods.

SSES changes the timing. Instead of relying on fixed off-peak periods, SSES allows compatible appliances to respond automatically to real-time electricity system conditions and then may provide additional rewards for helping support the grid.

Is SSES the Same as a Smart Appliance?

No. This is an important distinction:

SSES

SSES is the overall Government programme and framework.

Energy Smart Appliances

These are the devices that may participate within that framework.

Smart Appliances

A smart appliance is simply a product with some level of intelligent functionality.

For example, a smart hot water cylinder may already:

Connect to an app
Monitor temperatures
Follow schedules
Provide remote control

However, not every smart appliance should automatically be considered SSES-ready.

Future Energy Smart Appliances may also need to support:

Interoperability
Enhanced cybersecurity
Demand flexibility services
Standardised communication methods

These requirements are designed to ensure appliances remain secure, even as they connect to more services and interact with the wider electricity system.

In simple terms:

SSES is the system.
Energy Smart Appliances are the devices within the system.

Who Benefits From SSES?

Consumers

Potential benefits include:

Access to lower-cost tariffs
Flexibility rewards
Greater automation
Better use of renewable energy

Energy Suppliers

Benefits include:

Better demand management
Lower balancing costs
Improved network efficiency

The Electricity Grid

Benefits include:

Reduced peak demand
Improved resilience
Better utilisation of infrastructure

Government and Taxpayers

Benefits may include:

More efficient use of public and private infrastructure investment
Improved energy security
Progress towards Net Zero objectives
Reduced long-term system costs

Ultimately, the costs of running and expanding the electricity system are paid by society through energy bills and taxation.

A more efficient system benefits everyone.

Will the Government Control My Appliances?

No. The Government will not be connected to, monitor or directly control appliances in your home.

This is one of the most common misunderstandings about Smart Secure Electricity Systems (SSES). The purpose of the programme is not to take control away from consumers, but to help the electricity system operate more efficiently.

Instead, compatible Energy Smart Appliances may receive signals from energy suppliers, flexibility service providers or other authorised energy system services.

These signals simply indicate what’s happening on the electricity network, for example:

When demand is high
When renewable energy is plentiful
When spare capacity is available

The appliance can then respond automatically by choosing a better time to operate, helping reduce pressure on the electricity grid and make better use of renewable energy.

A useful way to think about this is as a more advanced version of Economy 7.

Instead of using the same fixed off-peak periods every day, compatible appliances can respond to changing conditions on the electricity system and adjust when they use electricity accordingly. In effect, the best times to use electricity can vary from day to day depending on electricity demand, renewable energy availability and conditions on the network.

Crucially, consumers remain in control.

Many future Energy Smart Appliances are likely to allow users to:

Override automated operation
Boost heating, hot water or charging when required
Set personal preferences and schedules
Monitor and adjust settings through apps, web portals or built-in controls

The goal is not to restrict how or when people use electricity.

The goal is to help the electricity system operate more efficiently while allowing consumers to benefit from lower-cost tariffs, flexibility payments and other incentives for supporting the grid.

Source: DESNZ Smart Secure Electricity Systems Programme Consultation, Energy Smart Appliances Framework and PAS 1878 consumer control requirements.

What Does SSES Mean for Manufacturers?

From a manufacturer's perspective, SSES is about far more than adding connectivity to products.

As smart energy systems develop, appliances will increasingly need to communicate securely, respond to energy signals and work alongside other technologies within the home.

Security is a particularly important consideration. As more appliances become connected to energy networks and flexibility services, manufacturers will need to ensure products can communicate safely, protect consumer data and operate reliably within the wider energy system. This helps reduce the risk of unauthorised access, cyber threats or disruptions that could affect large numbers of connected devices.

PAS 1878 and PAS 1879 are UK technical standards designed to help smart energy appliances communicate securely and work seamlessly with products from different manufacturers. (Source: British Standards Institution PAS 1878 and PAS 1879) By supporting cybersecurity, interoperability and flexibility services, these standards help ensure connected devices can operate safely, reliably and effectively within the wider energy system.

Manufacturers may also need to consider software updates, long-term cybersecurity support, appliance authentication, data protection and incident response procedures as connected products become increasingly integrated into flexibility services.

This means future products may increasingly need to support:

Secure connectivity
Interoperability
Cybersecurity
Intelligent control systems
Flexibility service integration

For manufacturers, SSES represents an ongoing move towards smarter, more connected products that can play an active role in the future energy system while maintaining high standards of security, reliability and consumer protection.

Frequently Asked Questions About SSES

The rollout is expected to happen gradually throughout the second half of the decade.

As smart appliances, smart tariffs and energy flexibility services become more widely available, participation is expected to increase.

Many of the technologies required already exist today, but wider adoption will depend on regulation, consumer uptake and continued industry development.

The rollout is expected to happen gradually throughout the second half of the decade.

As smart appliances, smart tariffs and energy flexibility services become more widely available, participation is expected to increase.

Many of the technologies required already exist today, but wider adoption will depend on regulation, consumer uptake and continued industry development.

Summary

Smart Secure Electricity Systems (SSES) is fundamentally about improving the way the UK's electricity system operates.

By enabling compatible appliances to receive and respond to signals from the wider energy system, SSES helps create a more flexible and efficient energy system.

Consumers may benefit through lower-cost tariffs and flexibility incentives.
Energy suppliers benefit through lower operating costs.
The electricity grid benefits through reduced peak demand and improved efficiency.
Government and taxpayers benefit through a more resilient energy system that makes better use of existing infrastructure while supporting the transition to a lower-carbon future.

The transition towards smarter energy systems is already underway. Drawing on experience gained through similar smart energy programmes in international markets, Cotherm (UK) Ltd continues to support the development of innovative heating and control technologies that enable greater energy efficiency, flexibility and intelligent control.

As technologies such as electric vehicles, batteries, heat pumps and smart heating systems become increasingly common, energy flexibility is expected to become an increasingly important part of the UK's future energy landscape.

As an added consumer benefit, many future Energy Smart Appliances are expected to provide consumers with convenient controls through mobile apps, web portals or other user interfaces, allowing users to view settings, adjust preferences and override automated operation when required.

Sources & Further Reading

This article is based on publicly available information from the organisations responsible for developing, regulating and operating the UK's electricity system.

Primary Sources

Department for Energy Security and Net Zero (DESNZ)
The UK Government department leading the Smart Secure Electricity Systems (SSES) programme and Energy Smart Appliances (ESA) regulations.

Ofgem
The UK's energy regulator, responsible for consumer protections, energy flexibility markets and smart energy frameworks.

Elexon
Provides governance and market arrangements that support demand flexibility and smart energy participation.

National Energy System Operator (NESO)

Responsible for balancing the UK's electricity system and planning for future energy demand, while also playing a key advisory role in the development of Smart Secure Electricity Systems (SSES).

Editorial Note

SSES is an evolving programme and regulations continue to develop. This article is intended as an educational overview based on information available at the time of writing.

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