51³Ô¹ÏÍø

Undaunted’s tenth cohort of Greenhouse founders is turning bold ideas into stronger businesses as they tackle some of the world's most pressing climate and sustainability challenges.

Since embarking on accelerator earlier this year, the sixteen ambitious climate startups participating in Cohort 10 have hit the ground running.

Through a series of intensive two-week sprints covering customer discovery, technology development, commercial strategy and intellectual property, they've been challenging assumptions, refining their propositions and identifying the fastest routes to impact. The process has sparked new customer conversations, product iterations and strategic partnerships. By the time they take to the stage at , the teams will have spent a year testing, refining and accelerating their ventures.

We're seeing teams that aren't just developing impressive tech, but building the foundations of businesses that can create meaningful climate impact. Maiko Schaffrath Head of The Greenhouse, Undaunted

The startups represent a broad range of deeptech, cleantech solutions. From clean energy and advanced materials to sustainable food systems, industrial decarbonisation and climate adaptation, each is developing technology designed to accelerate the transition to a low-carbon and climate resilient future.

"One of the most exciting things about this cohort is the pace at which the founders have embraced the programme," says Maiko Schaffrath, Head of The Greenhouse.

"They've approached every sprint with curiosity and ambition, testing their ideas with customers, sharpening their commercial strategies and learning from one another. We're seeing teams that aren't just developing impressive technologies, but building the foundations of businesses that can create meaningful climate impact."

The Greenhouse, which is currently , provides early-stage climatetech founders with mentorship, up to £20k grant funding, workspace, specialist workshops and access to 51³Ô¹ÏÍø's world-class expertise, facilities and networks. Throughout the 12-month programme, participants work closely with experienced entrepreneurs, investors and industry experts to accelerate their progress towards pilots, partnerships and investment.

"HSBC UK’s funding is what makes The Greenhouse possible providing grant support for every Cohort 10 founder and powering the curated acceleration programme that helps bold innovative solutions become investable, scalable businesses," said Natalie Gregoire-Skeete, Head of Sustainability at HSBC UK. "I’m also excited to see applications open for Cohort 11, including the new Opening Opportunities Fund, allowing more founders to take the leap into entrepreneurship."

Meet Greenhouse Cohort 10

Algiplex

  is developing biological infrastructure upgrades for existing microalgae producers, improving the economics and scalability of industries including sustainable agriculture, nutraceuticals, carbon utilisation and biomanufacturing. Its modular synthetic ecosystems harness beneficial relationships between microorganisms to improve the performance of existing cultivation systems, demonstrating more than eight-fold increases in microalgae productivity. Rather than requiring producers to replace costly physical infrastructure, Algiplex integrates with and enhances what is already there, enabling more biomass and value to be generated from existing cultivation capacity. 

eluna

eluna is securing sustainable energy storage.

FluoroCycle

is developing a low-energy chemical treatment making "forever chemical" destruction simple and affordable. 

FORAGER

FORAGER help farmers mitigate drought risks, nourish their soils, and protect their livelihoods.

Gradient Dynamics

is developing a physics AI engine to make climate hardware easy. 

GreenMixes

turns concrete carbon-negative with a proprietary drop-in biochar composite.

Hestora

: your home heating, reimagined. A boiler replacement for a world without fossil fuels. Hestora's thermal energy storage systems mimic your old boiler's performance, but without the emissions, operating at lower running costs. They require no outdoor unit, new radiators or behaviour change, and recharge via rooftop solar or on cheaper, cleaner electricity overnight. Hestora is a flexible demand asset for the grid — soaking up curtailed wind power and intelligently easing local network constraints. A scalable route to net-zero heating for grid-constrained new builds and hard-to-treat retrofit stock — warmer homes, lower bills, and no emissions. 

Hydro Flow Energy

is building TideMaster, a patent pending system that captures energy from the vertical rise and fall of the tide. It uses no turbines and no exposed moving parts in open water, keeping the working mechanism separated from the marine environment, and it can integrate with existing harbour, quayside and offshore structures. That approach is predicted to deliver a substantially lower cost of energy per megawatt hour. Tides are known years in advance, and TideMaster is designed to convert that predictability into a smooth power curve, delivering continuous forecastable baseload around the clock rather than intermittent output. The UK has one of the largest tidal ranges in the world and a vast number of deployable sites, and the modular design scales from a single quayside unit to megawatt arrays, powering ports, cold ironing and green hydrogen, with the same technology deployable worldwide.

InX Tech

deploys AUVs to survey the seabed and turn the data into actionable intelligence.

Karbana

Scalable manufacturing for cheaper, greener, more abundant battery anodes. 

Lir Labs

is developing biological wastewater imaging for process control and energy optimisation. 

MermaidAg

Weather is a constant challenge for farming, and climate change is increasing the frequency and severity of extreme weather events. Flooding is now one of the most destructive hazards facing global agriculture. is developing next-generation precision biostimulant treatments to help crops withstand flooding and waterlogging stress. Building on research from the University of Oxford, our technology aims to strengthen crop resilience, protect farm businesses and support more secure food production.

Nature Based Limited

is developing kelp forest 'shields' that protect offshore wind, cut costs by £1bn/GW, and restore ocean ecosystems. 

nth Power

builds the intelligent coordination layer for distributed energy fleets.

Potenix

is developing engineered biocatalysts and precision dosing to unlock the energy potential of AD plants. 

Resonant Grid

is developing software that turns smart meters into real-time grid intelligence for utilities.

Could this be you?

While their technologies span different sectors, these founders share a common goal: transforming innovative solutions into scalable businesses capable of delivering real-world impact on climate change and the environment. On graduating from The Greenhouse they will join a thriving  of startups and scale ups including:

• – who recently announced and whose tech has been , aiming to reduce CO₂ emissions by 55 tonnes a year.​
• – Earthshot Prize winners, who raised £20m additional investment in 2024 and are now rolled out across 51³Ô¹ÏÍø.
• – who raised £17m in 2024 and are now scaling up their water treatment tech.
• – who unveiled their plant-based sequins during Stella McCartney’s A/W 2025 show during Paris Fashion Week.
• – who are building a 25,000 tonne/year biomass processing plant producing commercial volumes of novel materials.

If you think this could be you, . Deadline: 21 August 2026.