Mast Energy Developments Acquires 7 MW FlexGen Site with £6M Guaranteed Income

MED signs offer to acquire a 7 MW 11kV flexible generation site in England

Mast Energy Developments (MED) has signed an offer to acquire an existing, already constructed 7 MW flexible generation site in England. It comes with planning consent, secured grid and gas connections, and a long-term lease. The proposed purchase price is £350,000, with completion targeted for Q4 2025, subject to due diligence and contract.

Crucially, the site carries a 15-year Capacity Market (CM) contract at £60,000 per MW per annum starting in 2028, which MED says equates to a cumulative guaranteed gross profit income of around £6 million before inflation uplifts. MED also plans to add annual T‑1 CM contracts in the interim and trade power via a Statkraft power purchase agreement (PPA).

Why 11kV matters: embedded benefits and profitability

MED prefers 11kV grid connections, and with good reason. Management says 11kV sites are generally about 25% more profitable than larger connection voltages like 33kV, helped by “Embedded Benefits” – distribution-level credits and cost advantages paid to locally connected generation. In plain English: being embedded in the local network often means lower charges and extra payments for being helpful to the grid.

This site is already built out to a large degree. The balance of plant is in place, consents are granted, and the connections are secured. Post-acquisition, MED says the key step is to install low‑carbon gas engines/turbines, with Rolls‑Royce mtu units under consideration – the same approach as its Hindlip new-build.

Capacity Market contract: a 15-year income floor from 2028

The existing CM agreement is the standout. MED states the site has a 15-year CM contract at £60,000 per MW per annum beginning in 2028, amounting to about £6 million of cumulative guaranteed gross profit income before inflation.

Quick explainer: the Capacity Market pays generators for being available during system stress, providing a predictable income layer alongside wholesale power trading. MED also plans to “top up” with short-dated T‑1 CM auctions in the interim years and will trade electricity under a PPA with Statkraft. That combination aims to blend a contracted floor with market upside.

Metric	Detail
Capacity	7 MW flexible generation
Grid connection	11kV (MED targets c. 25% higher profitability vs 33kV due to Embedded Benefits)
Site status	Constructed balance of plant; planning granted; grid and gas connections secured; long-term leasehold
Technology	Low‑carbon gas engines/turbines; considering Rolls‑Royce mtu engines
Capacity Market	15 years from 2028 at £60,000 per MW/annum; c. £6 million cumulative guaranteed gross profit income (pre-inflation)
Trading	PPA with Statkraft planned; T‑1 CM top-ups targeted before 2028
Proposed acquisition price	£350,000
Completion	Subject to due diligence and contract; MED expects Q4 2025 (not guaranteed)

Price tag vs income: why this looks attractive at first glance

£350,000 for a 7 MW, 11kV, consented and connected site with a long-dated CM contract looks compelling on paper. MED’s stated £6 million of cumulative guaranteed gross profit income (pre-inflation) from 2028 provides a meaningful floor to project economics.

But do not confuse the acquisition price with total project cost. MED still needs to procure and install the gas engines and carry out any limited overhaul works. The RNS does not disclose that capex, funding, or operating cost assumptions. The headline numbers are strong, but the full investment case depends on delivered capex per MW and timing to first revenues.

Strategic fit: duplicating Pyebridge and building towards 300+ MW

This deal hits one of MED’s three growth levers: acquiring already constructed sites needing minimal work for faster time-to-cashflow and lower cost per MW. Management points to Pyebridge as the proof point for this strategy. The other two levers – new-builds like Hindlip and AI datacentres – are being advanced in parallel, with an ambition to assemble a portfolio of 300+ MW.

In short, this site adds a de-risked, consented, 11kV project with a long CM runway. It is the sort of bite-sized acquisition that can scale if MED can repeat it several times over.

Timeline and next steps

MED expects to complete in Q4 2025, subject to confirmatory due diligence and final contracts. Post-completion, the plan is to install the low‑carbon gas engines/turbines and commence trading under a PPA, while bidding for T‑1 CM top-ups until the 15-year contract starts in 2028.

The company notes completion is not guaranteed. As ever with power assets, delivery, commissioning, performance testing, and market interface (with the grid operator and offtaker) are key milestones to watch.

Positives and risks for investors

What looks positive

• 11kV connection economics – MED targets c. 25% higher profitability versus 33kV, helped by Embedded Benefits.
• Constructed and consented – long-term lease, planning, grid and gas already in hand reduces build risk.
• Income floor – 15-year CM contract from 2028 equating to c. £6 million of cumulative guaranteed gross profit income (pre-inflation).
• Near-term revenue plan – PPA with Statkraft and T‑1 CM auctions to bridge to 2028.
• Capital-light entry price – £350,000 headline cost for an already built site is low versus the contracted income pool.
• Repeatable strategy – aligns with the Pyebridge “acquire and optimise” playbook within a broader 300+ MW target.

Main risks to keep in mind

• Deal completion – still subject to due diligence and contract; Q4 2025 is a target, not a certainty.
• Capex and funding – cost to procure and install engines, and how it will be funded, are not disclosed.
• Execution – delivery and commissioning of Rolls‑Royce mtu engines/turbines and achieving expected performance.
• Market and regulatory – CM obligations, penalties for non-availability, and power market volatility remain realities.
• Timing – slippage could defer revenues and T‑1 CM participation.

What’s not disclosed (yet)

• Exact site location.
• Total capex to reach commercial operations and expected timeline to first power.
• Funding structure for equipment and works.
• Expected revenue or EBITDA beyond the CM numbers noted.
• Any specific performance guarantees, warranties, or O&M arrangements.

My take: accretive if delivered, with a solid CM backbone

On balance, I like it. Paying £350,000 for a consented, connected 11kV site with a 15-year CM contract from 2028 and scope for interim T‑1 plus Statkraft trading is exactly the kind of disciplined, quick-to-market acquisition that can move the needle for MED if replicated.

The caveat is the unspoken capex and funding piece for the engines and any site works. If MED can keep costs tight and timelines on track, the embedded benefits and CM income should underpin attractive returns. Execution now matters more than the headline price. Deliver this one and the playbook becomes very repeatable.

Further information

• MED general enquiries
• MED email alerts
• MED LinkedIn page