Hydrogen manganese flow batteries for long duration storage

The technology

Long duration storage, built to scale

Underpinned by research published from Imperial College labs over the last eight years.

High voltage cells

High single cell voltage and high power density from an optimised cell architecture.

Low cost chemistry

Hydrogen and manganese, chosen for cost and for an enduring 20 plus year design life.

Bigger tanks

More hours of storage means more electrolyte, not a new giga factory.

Markets

Where certain energy matters

Behind the meter

Commercial and industrial sites cutting electricity costs and preventing blackouts.

Co located with renewables

Relieve network constraints, prevent curtailment and avoid grid upgrades.

Off grid

Microgrids that replace diesel generators for rural communities and businesses.

Projects

Discuss a storage project

Three short steps, about a minute.

Your project

Use case

Storage size

Timeline

Your details

Full name

Company

Work email

Phone (optional)

Thanks, your project enquiry is in

Preview only: nothing was sent. In the live build this lands in your CRM, alerts the right person and starts a follow up email.

What changes vs today

What we checked on Certain Energy's current site

Only issues we checked ourselves on 27 October 2026. Each item was checked on the live site.

TodayThe homepage still says "RFC Power's globally patented hydrogen manganese system".

→

In this rebuildOne brand, everywhere, with the RFC Power history told once on the About page.

TodayThe contact page lists info@rfcpower.com.

→

In this rebuildA Certain Energy address on every page, and enquiry forms that route by use case.

TodayThree markets are described in paragraphs with no next step.

→

In this rebuildA page and a project flow for each market, so every buyer has a clear way in.

FAQ

Questions developers ask

What is Certain Energy?

Certain Energy, formerly RFC Power, develops long duration energy storage based on a hydrogen manganese flow battery. It was spun out from Imperial College in 2017.

How does the battery work?

It combines the benefits of a flow battery with the best elements of fuel cell technology, converting electrical energy to chemical energy and back again.

How long is it designed to last?

Certain Energy says the chemistry is designed for 20 plus years of operation.

How does it scale?

Scaling means bigger tanks, not bigger factories. The company works with partners to use existing production facilities and supplier networks.

Where can it be used?

Behind the meter at commercial and industrial sites, co located with solar or wind, and off grid as part of a microgrid.

Who invested in the Series A?

The £10m round was led by the British Business Bank, with Centrica, Ceres Power and Temasek Trust's Catalytic Capital for Climate and Health also taking part.

The offer for Certain Energy

The three lower bands, or the large side.

A new name and a new round deserve one clear story. This licence finishes the rebrand, gives each market a way in, and keeps improving it every month.

The licence

Web, SEO, AEO

Lower band

£4,500 a month

Typical UK 2026: a web team, a B2B SEO shop, and an AEO retainer are three invoices. This is one. Then you raise it in the dashboard.

Web team: live site built past this demo, hosting, speed, edits. No one to manage
B2B SEO: one new search page and four content pieces in the base
AEO / GEO: schema, FAQ, llms.txt, 90 day plan, AI-citation report
This demo is the concept. Paying gets the better site plus those three, on one invoice
Need more? Raise web, SEO or GEO in the dashboard. It adds to the next invoice

Enterprise

Web, SEO, AEO

Large side

£9,500 a month

The large side of the same three retainers. Still one invoice. Still no one to manage.

Web team at the large end: more pages, priority edits, quarterly redesign in the base
B2B SEO at the large end: two search pages and eight content pieces a month
AEO / GEO at the large end: GEO boost in the base, llms-full, monthly AI Overview tracking
Same live site past this demo. Same dashboard. More of all three.
Setup is one month (£9,500). Or 12 months now at 15% off (£96,900) plus setup

Web team

Site, edits, hosting

Typical UK hours retainer is £900 to £4,800 a month, and they still own the CMS. The live site, past this demo, is in the base.

B2B SEO

Pages and compounding search

Typical UK B2B SEO is £1,500 to £5,000 a month. Serious SaaS shops are £3,000 to £10,000. Search pages and content are in the base.

AEO / GEO

Answers and AI citations

Typical UK AI-search start is about £2,500 a month. Mid-market to enterprise starts about £4,500. Schema, FAQ, llms.txt and the citation report are in the base.

ContractTwo ways, same three services. Lower band £4,500 a month, setup one month (£4,500). Enterprise £9,500 a month, setup one month (£9,500). Or 12 months now at 15% off (lower band £45,900, enterprise £96,900) plus setup. Dashboard extras bill on the next invoice. Cancel with 90 days' notice. You never own the website. Your content and domain stay yours. Prices exclude VAT.

Book a 15 minute call Licence dashboard Yusuf@yusuf-choudhury.com

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