Cornwall flexible energy trials prove success

Cornwall flexible energy trials prove success

Centrica completes the Cornwall Local Energy Market (LEM), the UK’s largest trial of energy flexibility, which saw over 200 homes and businesses trading stored renewable electricity

Electric vehicles, smart hot water tanks and battery storage are key to unlocking the Government’s wind power ambitions, by enabling home and business owners to trade electricity providing balance to the electricity grid, according to a report by Centrica. 

Such inter-trading of electricity is known as flexibility and the energy company has concluded the UK’s biggest trial of its potential in over 200 homes and businesses in Cornwall. Over three years, the £16.7 million Cornwall Local Energy Market saw 310MWh of power traded successfully, with greenhouse gas savings of nearly 10,000 tonnes a year as a result.  

In simple terms, flexibility means paying businesses and homes to increase, decrease or shift the times that they use or produce power in response to the needs of the grid. It is essential if the UK is to meet net zero goals and can help balance the peaks and troughs that come with low carbon sources of energy such as solar power and offshore wind.

Centrica has calculated that in order to accommodate the Government’s plans to power every home with offshore wind, as much as 25TWh of electricity will need to be traded flexibly every year - that’s almost double the annual electricity demand of Wales.  

As part of the trial, five megawatts of low carbon technology was installed across more than 100 businesses and a further 100 homes received a combination of solar panels and wall mounted battery storage. The stored capacity of the home battery systems was combined to form a Virtual Power Plant and, when aggregated, was able to trade with the grid operators, completely autonomously. Some businesses saved as much as 35% on energy costs by operating at times more aligned with grid needs.

A major stumbling-block on the introduction of a more flexible and responsive electricity grid was also overcome when, for the first time anywhere in the world, the local Distribution System Operator (Western Power Distribution) and the Transmission System Operator (National Grid ESO) both procured flexibility simultaneously via Centrica’s pioneering auction-based marketplace. This paves the way for a smarter grid that is better able to accommodate renewable energy.

Centrica’s ground-breaking LEM platform allows buyers to place bids for flexibility services, which are then matched with offers by sellers (homes and businesses) through auctions that run from months ahead all the way to same day. The platform manages the process for both sides from contract creation all the way to baselining and settlement, making it easy to trade flexibility.

“We showed that solutions like the Cornwall LEM can pave the way for a smarter grid that is better able to accommodate renewable energy; save money and reduce carbon for consumers; and create new economic opportunities for both homeowners and businesses. With the right policy actions by the Government, we believe that the UK can lead the world in creating solutions to integrate greater levels of renewables onto our energy systems,” added Jorge Pikunic.

The trial was delivered in partnership with the local distribution network operator Western Power Distribution, alongside National Grid ESO, Exeter University and Imperial College London, with additional support from the Belgian-based advanced energy analytics consultancy N-Side. It was funded by Centrica and the Centrica Energy for Tomorrow Fund, as well as a £11.6 million grant from the European Regional Development Fund.

Industry reaction

Energy Minister Kwasi Kwarteng, said:

“Smarter energy means greener energy and cheaper bills, which is why this successful trial in Cornwall is such good news.
“With even more renewable electricity on the way, projects like this will be crucial as we work towards net zero emissions by 2050.”

Emma Pinchbeck – Chief Executive of Energy UK:

“Flexibility will be essential for our future energy system and will help us achieve our net zero ambitions and maintain security of supply. This innovative project demonstrates how our homes and businesses can help balance the peaks and troughs in demand at a local level and provide them with significant cost benefits in the process. The electrification of heating and transport will greatly increase demand at peak times and flexibility will be absolutely vital to cope with this. The insights from projects like this alongside the right policy framework from government will help us to deliver flexibility at the large scale needed.”

Dr Nina Skorupska CBE, Chief Executive of the Association for Renewable Energy and Clean Technology (REA), said:

“Flexibility is a critical part of the net zero transition, and a prerequisite for the continued growth of renewable energy. Centrica’s Cornwall Local Energy Market has clearly demonstrated that distributed, decentralised assets can help businesses, households and the networks to play their part in delivering that transition. The government must now seize the opportunity through ensuring that key market policies allow innovative storage and flexibility projects to flourish.”

Colm Murphy, Electricity Market Change Development Manager at National Grid ESO, said:

 “This pioneering local energy market trial showcases a smart, flexible and decentralised electricity system in action. Exploring innovative ways to access flexibility through new markets is key to us unlocking the potential of distributed and community-based renewable energy resources, and will bring significant cost benefits to consumers.

 "While current levels of residential flexibility are low, as local market initiatives like the Cornwall LEM are introduced and consumers are increasingly incentivised to be flexible, we anticipate seeing a transformation in the way our nation consumes power. This will help us deliver clean, secure and affordable electricity – softening peaks in demand and filling in the troughs – and will take us another step closer to our 2025 ambition to operate a zero carbon grid.”

Jennifer Woodruff, Innovation and Low Carbon Networks Engineer from Western Power Distribution, said:

“This project has provided useful learning about different options for how we could purchase flexibility services, especially how we could build in processes to manage conflicts and avoid breaching network limits.” 

  • The Future of Flexibility - Centrica Cornwall LEM Report

    PDF - 1.63 mb



About the Cornwall Local Energy Market

  • The Cornwall Local Energy Market is part-funded by the European Regional Development Fund under the European Structural and Investment Funds Programme 2014-2020
  • The project is receiving £11m of funding from the England European Regional Development Fund as part of the European Structural and Investment Funds Growth Programme 2014-2020. For more information about the project visit:
  • The Ministry for Housing, Communities and Local Government (MHCLG) is the Managing Authority for the European Regional Development Fund in England
  • Established by the European Union, the European Regional Development Fund (ERDF) helps local areas stimulate their economic development by investing in projects which will support innovation, businesses, create jobs and local community regenerations. For more information visit