Best Angel Networks for CleanTech Startups (UK)

May 4, 2026
Last updated

Navigating the early fundraising stages for a CleanTech startup in the UK can often feel like trying to measure the wind – full of potential, yet hard to harness. You've developed innovative solutions for a sustainable future, but securing the initial capital to bring those solutions to market is a distinct challenge. Identifying the right funding partners, especially in a rapidly evolving sector like CleanTech, demands a clear understanding of the landscape.

In the current UK market, where investment in sustainable technologies is growing but competition remains fierce, Angel Networks are more critical than ever for CleanTech founders. Early-stage deal volume has seen fluctuations, emphasizing the need for strategic connections. These networks don't just provide capital; they offer invaluable sector-specific expertise, mentorship, and connections that can de-risk and accelerate your startup's growth.

An Angel Network is essentially a group of high-net-worth individuals who pool their resources and collective experience to invest in promising early-stage companies. For a CleanTech venture, this means accessing investors who are often seasoned entrepreneurs or industry experts with a deep understanding of sustainable technologies, market trends, and regulatory landscapes. Unlike traditional venture capital firms, which often seek larger, more established opportunities, angel investors are typically more comfortable with the higher risk profile of nascent startups and can offer more flexible terms.

When considering an Angel Network for your CleanTech startup, it's crucial to look beyond just the investment amount. Evaluate the network's experience in the CleanTech sector – do their members have a track record of supporting similar innovations? Consider the value-add beyond capital, such as mentorship opportunities, access to industry contacts, and strategic guidance. A network with aligned expertise can provide critical insights into market validation, product development, and scaling strategies unique to CleanTech.

Choosing the right Angel Network can be the decisive factor between a fundraising journey that feels like an uphill battle and one that accelerates with the support of well-informed partners. It's about finding a collective that not only believes in your CleanTech vision but also possesses the experience to help you achieve it. With the right Angel Network, you gain a powerful catalyst for faster, smarter fundraising and sustainable growth.

Anglia Capital Group

Anglia Capital Group

Angel Network

Cromer; UK

Anglia Capital Group is a leading group of business angel investors in the East of England.

Anglia Capital Group was established in the Spring of 2014, to support spinouts, new ventures and growth businesses in both Norfolk and Suffolk: counties boasting expertise in food and agri/biotech, specialist engineering and energy.

Our members are both leading entrepreneurs and experienced business people united in their desire to invest in the next generation of businesses in East Anglia.

ThatRound Rating
5
ThatRound Raised
£156K
Henley Business Angels

Henley Business Angels

Angel Network

Henley; UK

Henley Business Angels (HBA) is a network of experienced business leaders, successful entrepreneurs and investors. The network’s aim is to facilitate opportunities for members to invest in and mentor (S)EIS registered early-stage businesses launched by entrepreneurs who graduated from or are connected with Henley Business School and the University of Reading. Henley Business Angels is also keen to support and educate entrepreneurs to contribute to the quality of the founder ecosystem, through initiatives such as our quarterly Investment Readiness Workshop.

ThatRound Rating
3
ThatRound Raised
£0
MAINStream

MAINStream

Angel Network

Exeter; UK

With over 90 members across two networks, MAINstream South West and MAINstream Cheltenham, MAINstream seeks to connect high-growth companies with investors that are local to them, with the aim of helping to drive growth in the region.

Many of our members have started, scaled, and excited successful businesses and are keen to pay it forward by supporting start-ups themselves, both financially and by offering their support and guidance.

We know how important angel investment and support is, and how difficult it can be to access, so we are very proud that a number of high growth businesses have already raised investment from the network, and are excited to help support the next generation of founders with their funding plans.

ThatRound Rating
ThatRound Raised
£0
Angel Academe

Angel Academe

Angel Network

London; UK

Angel Academe is a first of its kind, fast-growing and award-winning angel investor network. Since 2014, they've helped female founders who can demonstrate some early success with their tech startups access a unique pool of engaged, mainly female investors. Angel Academe investors have backed 51+ startups through 100+ funding rounds, helping them raise well over £150m from angels, VCs and family offices to continue to grow their med tech, clean tech, fin tech and enterprise software businesses. Their investor-members are successful entrepreneurs and senior leaders who want to be part of a diverse, experienced and professionally managed network.

ThatRound Rating
4
ThatRound Raised
£0
Angel Invest Wales

Angel Invest Wales

Angel Network

Cardiff; Wales

Launched in May 2018, Angels Invest Wales is helping to grow the angel community in Wales, connecting entrepreneurs seeking finance and expertise with business angels and syndicates.We work with our ‘registered’ investors, businesses in Wales and professional advisers and referrers, including banks, accountants and legal experts, as well as local authorities and the Welsh Government.

ThatRound Rating
ThatRound Raised
£0
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