Cornwall flexible energy trials prove success


Centrica has completed its Cornwall Local Energy Market (LEM) trial 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.

“Because solar and wind are dependent on the weather, sometimes they produce too much power for the grid to accommodate, and sometimes too little to meet demand. This could lead to assets being switched off, which is expensive and inefficient; and in extreme cases power cuts. Flexibility offers an alternative, more cost-effective way of tackling these constraints and gives consumers a real stake in managing the energy system. At a national level, the system is managed using flexible demand, battery storage and flexible generation, however, it is becoming increasingly important to manage network constraints at a local level too. “The trial in Cornwall has proved that homes and small businesses can play a role, alongside larger industry, in market-based procurement of flexibility – a genuinely new tool in our low-carbon energy system toolbox,” comments Jorge Pikunic, managing director, Centrica Business Solutions.

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.

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.”

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.”


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