Quantum Data Energy PLC

(Incorporated in England and Wales)

(Registration Number: 12886458)

LEI :213800HFVHGJ9YGO9F71

Share code on the LSE: MAST

ISIN: GB00BNG90H86

Dated: 9 December 2025

Quantum Data Energy PLC

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

Electricity Generation and Revenues Surge at Pyebridge 8.1 MW FlexGen Power Asset

London, UK - Quantum Data Energy PLC (LSE: MAST) is pleased to announce, further to its RNS announcement dated 18 November 2025, that its 100% owned Pyebridge 8.1 MW flexible generation power asset has sustained the trend of the past few months with record high monthly electricity generation and associated revenues. Electricity generation for the first 11-month period of 2025 has increased with c. 71% compared to the same period in the prior year, and total revenues for the first 11-month period of 2025 increased with c. 136% compared to the same period in the prior year.

Key Highlights:

·    Pyebridge maintained strong monthly electricity generation output and sales of c. 1.3 Gigawatt/hours ("GWh") for the month of November 2025, consistent with October's record high performance;

·    Pyebridge generated and sold c. 9.2 GWh of electricity during the first 11-month period of 2025, representing an increase of c. 71% compared to the first 11-month period of the prior year;

·    This sustained output underscores the asset's robust operational performance and the growing demand for flexible generation capacity amid intermittent renewable supply;

·    Total revenues generated for the first 11-months of 2025 came to c. £1.45 million, representing Pyebridge's highest income generated over the first 11 months of any year, and an increase of c. 136% compared to the same period in 2024;

·    Total revenues are based on an average of c. 5.5 MW in production over the period, representing c. £286,000 per MW per annum;

·    During the first 11-months of 2025 Pyebridge achieved an average electricity sales price of c. £139/MWh representing an outperformance of c. 71% compared to the average wholesale market electricity price over the same period; and

·    During the first 11-month period of 2025 Pyebridge generated and sold electricity for an average of 11 hours per day, demonstrating the ongoing strong demand for flexible power generation and validating QDE's business model.

Tanya Zwemstra, Head of Finance at Quantum Data Energy PLC, said: "We are pleased to report that Pyebridge consistently delivered monthly electricity generation exceeding 1 GWh for three consecutive months, accompanied by strong revenue performance. This achievement highlights QDE's unwavering commitment to delivering reliable energy to the UK grid through scalable, flexible, modular power solutions."

About Quantum Data Energy PLC:

Quantum Data Energy PLC (LSE: MAST) is a UK-based developer, operator and owner of flexible generation power assets. The Company has deep expertise in infrastructure planning, grid access, gas access, and efficient power supply. Its new AI power supply strategy is intended to position Quantum as a leading AI infrastructure platform on the London Stock Exchange.

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ENDS

This announcement contains inside information for the purposes of the UK version of the Market Abuse Regulation (EU No. 596/2014) as it forms part of United Kingdom domestic law by virtue of the European Union (Withdrawal) Act 2018 ('UK MAR'). Upon the publication of this announcement, this inside information is now considered to be in the public domain.