What Jem Energy does

Jem Energy Ltd is a UK-based renewable energy installation company founded in 2015 and headquartered in Farnborough, Hampshire, with a registered office in London. The company designs, supplies, and installs residential and small-commercial renewable energy systems, with a core product portfolio spanning Solar PV installations, battery storage systems, air source heat pumps, thermodynamic hot water systems (marketed as the Bunsen Air system under an exclusive South-of-England installer arrangement with Solamics Ltd), and EV chargers. Jem Energy holds Microgeneration Certification Scheme (MCS) accreditation and Home Insulation & Energy Systems (HIES) approval, both of which are prerequisites for accessing UK government incentive schemes including the Boiler Upgrade Scheme (£7,500 grant toward heat pump installations) and the Smart Export Guarantee. The Bunsen Air thermodynamic system is the company's principal technical differentiator: it uses externally mounted thermodynamic collector panels paired with an internal rotary-compressor heat pump unit, a refrigerant with a -26°C boiling point, and dual-panel/dual-exhaust architecture to deliver hot water 365 days a year, including at night and in sub-zero temperatures, with a stated COP of 7.3 at 8°C outdoor temperature.

The company operates a sales-led, direct-to-customer go-to-market model targeting UK homeowners via its website, freephone and local phone lines (01252 900052 / 0808 164 6568), online contact forms, and a £100 dual-sided referral program. Revenue is earned primarily through one-time installation fees per project, with custom quotes generated after on-site surveys. Jem Energy refers solar PV customers exclusively to Octopus Energy for tariff and Smart Export Guarantee enrolment, and previously layered an EnergiToken incentive via Energi Mine. The company has completed hundreds of installations since inception, with notable commercial projects including Tyburn Convent (six cumulative Bunsen Air systems) and Benedictine Monastery Scotland (three systems). On January 17, 2025, Jem Energy was acquired by 21 Degrees, a strategic acquirer focused on whole-home energy efficiency, integrating Jem Energy's installer footprint into a broader energy-efficiency platform.

Name

Jem Energy

Legal name

Jem Energy Ltd

Website

https://jem-energy.co.uk

Company type

Private

Founded year

2015

Operating status

Acquired

Headcount range

1–10 employees

Short description

Jem Energy is a UK-based renewable energy installer founded in 2015, specialising in solar PV, battery storage, air source heat pumps, thermodynamic hot water systems (Bunsen Air), and EV chargers for residential customers across the United Kingdom, acquired by 21 Degrees in January 2025.

Ownership category

akta.pro rank

Headquarters

HQ city

Fleet

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

Offering type

Services

Cost components

Others

Revenue model

1. Renewable Energy System Installation: One-time installation fees for Solar PV, Battery Storage, Air Source Heat Pumps, Thermodynamic Hot Water Systems, and EV Chargers. Revenue is earned per project upon completion of installation. Customers receive custom quotes based on property surveys. The company also qualifies customers for government incentive schemes (BUS, SEG) which reduce upfront costs.
2. Solar Panel Sales: Sale of solar PV panels and associated hardware. May include ongoing maintenance or support services.
3. Feed-in Tariff & Smart Export Guarantee: Customers with solar PV installations can earn money by selling excess energy back to the grid through government-backed schemes (FIT historically, now SEG). Jem Energy facilitates these payments by connecting customers with energy suppliers.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

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Product overview

Jem Energy is a renewable energy installation company offering a portfolio of interconnected clean energy products for UK homes. Their core offerings include Solar PV Installations (generating electricity from sunlight), Battery Storage (storing excess solar energy for evening use), Air Source Heat Pumps (heating homes using ambient air energy), Thermodynamic Hot Water Systems branded as Bunsen Air (providing hot water year-round using thermodynamic technology), and EV Chargers (for electric vehicles). These products work together to maximize energy independence, reduce grid reliance, and lower carbon footprints. The company is MCS and HIES accredited, operates across the UK, and was established in 2015, with recent acquisition by 21 Degrees in January 2025.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Up to 90% savings on hot water energy bills with thermodynamic systems
• +7 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• 21 DegreescoreStrategic or Co-development Partner · 17 January 2025On January 17, 2025, Jem Energy announced it is now part of 21 Degrees. This strategic partnership is described as a major milestone that will further strengthen Jem Energy's ability to deliver industry-leading renewable energy solutions to homes and businesses across the UK. Existing Jem Energy customers will continue to receive the same high-quality solar PV, battery storage, and renewable heating solutions, while gaining access to 21 Degrees' expanded network, products, services, and expertise. 21 Degrees' mission is that every home should be a haven of energy efficiency, health, and comfort.
• Octopus EnergyminorGTM or Marketing Partner · 4 November 2019Jem Energy exclusively recommends and refers customers to Octopus Energy following installation of a Jem Energy solar system. Octopus Energy provides money-saving tariffs and rewards for those with solar energy installations.
• Solamics LtdcoreTechnology or Integration · 16 July 2018Jem Energy is a representative and primary installer of the Solamics Bunsen Air Thermodynamic Hot Water System in the South of England. The Bunsen Air system was launched onto the UK market following 12 years of research and development. Jem Energy has installed hundreds of these systems across the UK.
• Energi MineminorGTM or Marketing Partner · 5 July 2018Jem Energy partnered with Energi Mine to offer EnergiToken (ETK) rewards to customers for clean energy purchases. ETK tokens can be spent on Jem Energy products and services including thermodynamic hot water systems, battery storage, and solar PV units. This is a joint marketing and incentive program to encourage green energy choices.

Scale indicators5 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Project Solar UK: UK solar PV and battery installer with a sales-led, nationwide-installation model targeting homeowners. Comparable in product scope (solar + storage), sales-led GTM, and MCS-accredited positioning.
• BOXT: UK direct-to-consumer heat pump, boiler, and solar installer serving homeowners with a vertically integrated sales-and-install model. Directly comparable to Jem's heat-pump-led GTM and reliance on Boiler Upgrade Scheme demand.
• Evergreen (formerly PureStat / Sunsure Energy): UK residential solar PV and battery storage installer targeting homeowners with a similar sales-led, on-site-survey model. Same product portfolio (solar, battery) and same MCS-eligibility-driven value proposition as Jem.
• NXG Renewable Installations: UK-wide renewable energy installer specialising in solar PV, battery storage, EV chargers, and heat pumps for residential customers. Directly comparable product mix, customer segment, and MCS-certified installation model.

Emerging players

• Kensa Heat Pumps: UK heat-pump manufacturer and installer network. Comparable as a specialist heat-pump participant in the UK Boiler Upgrade Scheme–driven market, with overlap in installer-accreditation and homeowner-led demand.
• Octopus Energy (Heat Pump & Solar Installations): Utility-affiliated energy supplier that has expanded into in-house solar PV, heat-pump, and EV charger installations. Comparable because it is disrupting the same UK residential renewables installer market and benefits from bundled energy-supply customer acquisition.

Others

• Solar Energy UK: UK solar industry trade association shaping the regulatory and policy framework (MCS standards, BUS, new-build rules) under which Jem and its competitors operate. Relevant as an ecosystem shaper influencing demand and installer accreditation.

Broad incumbents

• E.ON UK (Solar & Heat): Major UK energy supplier with a residential solar PV, battery, and heat-pump installation offering. Comparable as a broad-incumbent competitor in Jem's core UK homeowner market, with bundled energy-tariff cross-sell.
• British Gas / Hometree: Incumbent UK energy supplier that acquired Hometree, adding solar, heat-pump, and EV-charger installation capability at scale. Overlaps directly with Jem's offerings and competes for the same MCS-eligible residential customer base.
• EDF Renewables (UK Residential): Major UK utility offering residential solar PV, battery storage, and heat-pump solutions as part of its broader energy-supply and services portfolio. Comparable because it competes in the same MCS-gated residential installation market with the backing of a much larger balance sheet.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks7 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/jemenergyltd
• Xx.com/jemenergy
• LinkedInlinkedin.com/company/jem-energy-ltd

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Jem Energy