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TechCrunch’s December 2025 roundup names 22 clean-tech and energy startups selected for the Startup Battlefield 200 at Disrupt 2025. They work on batteries, energy systems, carbon conversion, recycling, water, buildings and more. “Top” is the roundup’s editorial label—not a ranking: it supplies no comparative scores, verified performance results or investment recommendations.
The distinction matters for readers assessing climate businesses. The list is a useful map of ideas and markets, but not evidence that a company has a proven product, paying customers or attractive economics. Below, each startup is grouped by the problem it addresses, with the key proof points a buyer or investor would need to examine.
TechCrunch’s roundup describes a competition that narrows thousands of applicants to 200 selected companies. Twenty compete on the main stage; the remaining selected startups take part in category competitions. The roundup says the overall winner receives the Startup Battlefield Cup and $100,000. It does not say that all 22 clean-tech companies were main-stage finalists or winners.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →The list below follows TechCrunch’s descriptions of the startups and adds a practical lens: who might buy the product, what it is intended to do, and what remains to be demonstrated. Unless stated otherwise, the roundup does not establish deployment stage, customers, independent testing, regulatory approvals, revenue or manufacturing scale. Product benefits and performance figures should therefore be read as descriptions or company claims, not verified results.
Energy, batteries and grid flexibility
COI Energy — enterprise energy flexibility
COI Energy operates a marketplace for buying and selling excess enterprise energy capacity and offers predictive energy insights. Potential users include businesses with multiple sites, energy providers and demand-response participants. The practical test is whether the platform can coordinate capacity safely and integrate with utilities, building-management systems and existing energy programs. The roundup does not establish measured savings or deployments.
Emobi — EV charging software
Emobi offers a cloud platform intended to make EV charging more interoperable, including support for legacy charging equipment. Its value depends on real compatibility: which chargers, networks, vehicles, payment systems and roaming arrangements work together, and how reliably. “Universal” charging is an aim, not proof that every combination is supported.
EnyGy Limited — ultracapacitors
EnyGy is developing ultracapacitors with activated-carbon electrodes and an advanced electrolyte. The company claims energy density up to twice that of alternatives while remaining cost-effective. Those comparisons need a defined benchmark and independent testing across energy density, power, cycle life, safety and cost. The roundup does not provide test methods or results.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsGemini Energy — on-site fuel-cell power
Gemini Energy develops fuel-cell systems that convert gas into electricity without combustion, targeting data centers and other customers seeking on-site power. Avoiding combustion does not, by itself, establish zero lifecycle emissions. Buyers would need to know the fuel, its origin, remaining emissions, operating costs, reliability and how the system compares with grid power, batteries and conventional generators.
HKG Energy — silicon battery material
HKG Energy is developing a silicon material for lithium-ion batteries. It claims up to 80% better battery performance at up to 40% lower cost than conventional materials. “Performance” could mean energy density, charging speed, cycle life or another measure; the comparison is difficult to assess without that definition. Silicon expansion and degradation, manufacturing yield and binder requirements are among the technical and production questions to resolve.
HyWatts — hydrogen-based off-grid power
HyWatts offers modular “Power-Plant-in-a-Box” systems combining hydrogen storage and reversible fuel cells for off-grid electricity, described as zero-emission. That description needs lifecycle context: hydrogen production, transport and leakage can affect emissions, while storage safety, round-trip efficiency and cost per delivered kilowatt-hour shape the system’s suitability. Batteries or hybrid systems may be more practical for some use cases.
Whisper Energy — small-building efficiency
Whisper Energy is developing an AI-native sensor and system intended to improve energy efficiency in small and midsized commercial buildings. A building owner would need evidence of measured savings and payback, plus details on installation, sensor coverage, interoperability, cybersecurity and maintenance. The roundup does not establish those outcomes.
Carbon, industrial decarbonization and construction
CarbonBridge — microbial gas fermentation
CarbonBridge uses bioreactors for microbial gas fermentation, with the aim of turning waste gases such as methane and carbon dioxide into valuable molecules. Commercial viability depends on which gases can be processed, their required concentration and consistency, plant throughput and the economics of downstream separation. Using a carbon-containing gas to make a product is carbon utilization; it is not automatically durable carbon removal.
Carbon Negative Solutions — cement from industrial waste and minerals
The company uses an AI-powered platform to convert industrial waste and minerals into cement, describing its material as carbon negative. That claim needs lifecycle accounting with a clear baseline, including feedstock processing, energy use and transport. Construction buyers also need evidence that the material meets relevant performance and building-code requirements and can be made with available equipment.
Coral — carbon accounting
Coral offers an AI-powered platform for collecting energy-footprint data and tracing carbon credits. Better data can help organizations measure and report emissions, but accounting software is not itself proof that emissions have fallen. Buyers should look for auditable Scope 1, 2 and 3 data, transparent estimation methods and clear documentation of what blockchain contributes to credit traceability.
Helix Earth — HVAC and carbon capture
Helix Earth applies liquid-gas chemistry originally developed for spacecraft to products for HVAC efficiency and carbon capture. The roundup does not specify commercial performance or deployments. For building owners, the questions include retrofit compatibility, energy savings, capture performance, maintenance requirements and any relevant refrigerant or operating constraints.
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Kaio Labs is developing technologies to convert waste CO₂ into chemicals such as carbon monoxide, formic acid and ethylene, using AI to automate discovery. A promising chemical pathway still has to work as a process: energy input, feedstock purity, catalyst life and product separation all affect cost and emissions. Selling a carbon-derived chemical does not necessarily keep the carbon out of the atmosphere permanently.
Materials, recycling and circularity
AraBat — battery recycling with plant waste
AraBat uses plant waste, including citrus peels, to recover nickel, cobalt and other critical metals from spent lithium-ion batteries. The key comparison is with established recycling processes: recovery rates, throughput, cost, feedstock tolerance and consistency. Battery chemistry and the condition of incoming material can vary, so results on one waste stream would not establish performance across the market.
Aruna Revolution — compostable menstrual pads
Aruna Revolution makes compostable natural-fiber menstrual pads from agricultural by-products. The product’s environmental case depends on more than its feedstock: absorbency, comfort, hygiene, shelf life, price and relevant certifications all matter. “Compostable” also requires clarity about the conditions and facilities needed for disposal.
Ganiga Innovation — automated recycling bin
Ganiga Innovation makes Hoooly, an AI- and robotics-powered garbage bin designed to recognize and sort recyclables, with analytics for enterprise campuses and industrial sites. The useful measure is whether it improves material quality, reduces contamination or lowers total handling costs compared with existing collection and centralized sorting—not simply whether it can identify objects.
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MacroCycle Technologies — polyester textile recycling
MacroCycle Technologies has a patented process for recycling polyester textiles and aims to make recycled plastic as inexpensive as virgin material. The roundup does not establish that cost target. A decisive test is performance on real post-consumer textiles, which may be blended, dyed or contaminated, at commercially meaningful volumes and yields.
Water quality and treatment
Segura — water-testing strips
Segura offers a proprietary test strip intended to deliver rapid water-quality results without specialist testing personnel. The roundup does not specify the contaminants it measures, detection thresholds or error rates. Buyers should distinguish a screening tool from a test validated for regulatory or drinking-water compliance.
ShellVive — filtration material from oyster shells
ShellVive uses discarded oyster shells as the basis for an affordable water-filtration material. Assessment requires contaminant-specific performance data, consistent shell processing and sanitation, and a plan for regeneration or disposal. The material’s environmental value also depends on collection and supply-chain impacts.
Xatoms — photocatalysts for polluted water
Xatoms uses AI and quantum chemistry to discover photocatalysts intended to remove bacteria, viruses, chemicals and heavy metals from polluted water. Those are very different targets, and identifying a promising catalyst is not the same as validating a treatment system. Evidence should show performance in relevant water conditions, treatment capacity, operating inputs and the handling of residual waste.
Buildings, land and residential efficiency
HomeBoost — home energy assessments
HomeBoost ships homeowners hardware and a smartphone app to identify leaky windows and other energy losses. Energy experts review the results and point to potential savings or rebates. Accuracy matters, as does whether suggested upgrades suit the home and whether rebate details are current for the homeowner’s location and utility. The roundup does not establish measured savings or payback.
Namu Robotics Corporation — tree-planting robots
Namu Robotics builds robots for reforestation, particularly where labor shortages and difficult terrain limit planting. Planting speed alone is not a measure of restoration success. Buyers and project partners need data on survival rates, terrain performance, seedling handling, logistics and cost per surviving tree.
Naware — steam-based weed control
Naware makes an AI-powered weed-control device that attaches to lawn-mowing equipment, detects weeds and treats them with hot steam instead of herbicides. Performance depends on detection accuracy, treatment speed, energy use, equipment compatibility and safety for surrounding turf. Results may vary by weed species and field conditions.
How to assess the 22 beyond the headline
These companies do not all solve the same kind of problem. A carbon-accounting platform may improve measurement; a fuel cell may provide power; a water product may target health or pollution; and a recycled material may reduce demand for virgin feedstock. Their outcomes cannot be compared with one generic “climate impact” score.
- Identify the actual stage. Is the technology a research result, prototype, controlled pilot, commercial product or scaled operation? The roundup does not answer this consistently.
- Ask what the product replaces. Compare it with the real incumbent—such as existing battery recycling, grid power, cement, building controls or water testing—and use a realistic baseline.
- Demand the right metric. Depending on the business, that may be cost per kilowatt-hour, ton of material recovered, building served, tree surviving or volume of water treated. “Affordable,” “efficient” and “lower carbon” need boundaries and benchmarks.
- Check deployment friction. Grid systems, hydrogen storage, construction materials, industrial processes and water treatment may require infrastructure, certification and long sales cycles. Software can be quicker to deploy but still faces integration, data-quality and trust hurdles.
- Look for lifecycle effects. Energy use, manufacturing, feedstock sourcing, transport, waste and end-of-life handling can change a product’s environmental balance.
- Separate measurement from reduction, and utilization from removal. Better carbon reporting does not guarantee lower emissions. Converting CO₂ into a product does not automatically store it durably.
- Verify the buyer and economics. A plausible customer is not the same as a paying customer. Useful evidence includes deployments, repeat purchases, certifications, unit economics and a credible route to manufacturing scale.
AI appears in several descriptions, including carbon accounting, materials discovery, sorting, building analysis and weed detection. Its presence is not a performance result: the relevant question is what task the system performs and whether it improves an outcome that customers can measure.
TechCrunch’s 2025 Startup Battlefield coverage places this roundup among category lists from the broader event. The 22 companies offer a snapshot of the range of climate and environmental problems drawing startup attention, not a due-diligence report. For a business, investment or partnership decision, the next step is company-specific verification of performance, customers, regulatory status and economics.
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