Record High Electricity Sales

(Registration Number: 12886458)

Share code on the LSE: MAST

Dated: 18 November 2025

Quantum Data Energy PLC

("Quantum", "QDE" or the "Company")

Record High Electricity Sales at Pyebridge 8.1 MW FlexGen Power Asset

and

Boosts Income with 15-Year Maximum Capacity Market Contract

London, UK - Quantum Data Energy PLC (LSE: MAST) is pleased to announce, further to its RNS announcement dated 14 October 2025, that its 100% owned Pyebridge 8.1 MW flexible generation power asset has achieved a new record high monthly electricity generation and associated sales, driven by solid operational performance and strong market demand for flexgen power. Further, Quantum has significantly boosted its Pyebridge asset's income with the successful qualification for a maximum capacity and term, 15-year Capacity Market contract following the recent qualification results announcement by the National Energy System Operator ('NESO').

Pyebridge Revenue Update Key Highlights:

• Pyebridge achieved a new record high monthly electricity generation output and sales of c. 1.3 Gigawatt/hours ("GWh") for the month of October 2025, representing an increase of c. 29% compared with September 2025;
• Pyebridge generated and sold c. 8 GWh of electricity during the first 10-month period of 2025, representing an increase of c. 71% compared to the first 10-month period of the prior year;
• The increase in output and sales are a clear indication of our asset's solid operational performance and the continued rise in demand for flexible generation power capacity due to intermittent renewable energy supply;
• Total revenues generated for the first 10-months of 2025 came to c. £1.28 million, representing Pyebridge's highest income generated over the first 10 months of any year, and an increase of c. 141% compared to the same period in 2024;
• Total revenues are based on an average of c. 5.3 MW in production over the period, representing c. £288,000 per MW per annum;
• During the first 10-months of 2025 Pyebridge achieved an average electricity sales price of c. £141/MWh representing an outperformance of c. 73% compared to the average wholesale market electricity price over the same period; and
• During the first 10-month period of 2025 Pyebridge generated and sold electricity for an average of 10 hours per day, demonstrating the ongoing strong demand for flexible power generation and validating Quantum's business model.

Capacity Market Key Highlights:

• The UK Capacity Market ("CM") is a government-backed scheme designed to ensure security of electricity supply by providing guaranteed income payments to reliable sources of capacity, such as Quantum's flexible generation power assets;
• The benefits of a CM contract include guaranteed, stable, long-term revenues, reducing exposure to wholesale market volatility;
• With reference to the announcement on 23 September 2025, Pyebridge successfully fulfilled the necessary requirements under the CM rules and submitted an application for the CM auction, for a maximum tenure 15-year T-4 CM contract at the asset's maximum possible generation capacity of c. 8.1 MW;
• On 11 November 2025 Pyebridge received confirmation from NESO that the application was successful, and Pyebridge qualifies to take part in the CM auction taking place in March 2026;
• Pyebridge already has an uninterrupted series of existing 1-year CM contracts covering the period until 2029, amounting to cumulative total guaranteed gross profit income of c. £1.7 million, as previously announced;
• This latest CM bid and associated CM contract will cover the period from 2029 until 2044, and provides Pyebridge and Quantum with a significant boost in uninterrupted guaranteed gross profit income until 2044;
• Assuming that the upcoming T-4 CM auction price clears at the same price as last year of £60,000 per MW/annum, which is expected, means that Pyebridge's new CM contract will have a cumulative total guaranteed gross profit income value of c. £6.5 million (before annual inflation increases), in addition to the c. £1.7 million of its existing CM contracts, totaling c. £8.2 million; and
• The CM contract income is over and above the site's merchant market trading revenue via its PPA with Statkraft, and Embedded Benefits revenue.

Tanya Zwemstra, Head of Finance at Quantum Data Energy PLC, said: "We are pleased to report that the CM pre-qualification application was successful and that Pyebridge achieved a new record high monthly electricity and revenue generation in two consecutive months. This performance provides clear and tangible evidence of the strong demand for flexible power generation and underscores the importance of Quantum's assets as critical power solutions to the UK grid."