You asked about Hydrogen Energy
81 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-01 | First electric business aircraft designed for hydrogen propulsion · beyond-aero.com | still up |
| 2023-06-01 | YCHyLight Unmanned airships for inspecting our critical assets · hylight.aero | still up |
| 2023-01-01 | Emission free hydrogen electric aircraft · stralis.aero | still up |
| 2016-01-01 | AI + Robotics for the Built World · geckorobotics.com | still up |
| 2020-06-01 | YCStatiq. India's Largest EV charging network · statiq.in | still up |
| 2015-01-01 | YCZeitview Inspection software for renewable energy & sustainable infrastructure · zeitview.com | still up |
| 2014-06-01 | Building the world's first fusion power plant · helionenergy.com | still up |
| 2021-01-01 | YCGridware Protecting the grid today, preparing the grid for tomorrow · gridware.io | still up |
| 2016-06-01 | Making car ownership and management frictionless. · yoshimobility.com | still up |
| 2016-06-01 | YCValidere A carbon MRV solution for energy and hard-to-abate sectors · validere.com | still up |
| 2015-01-01 | YCBright Sunrun for the developing world · thinkbright.mx | still up |
| 2016-06-01 | Raptor Maps builds software to manage the solar PV lifecycle. · raptormaps.com | still up |
| 2021-01-01 | YCEnode Energy Orchestration Platform · enode.com | still up |
| 2023-01-01 | YCRUUF Managed marketplace for solar in Latam · ruuf.cl | still up |
| 2018-06-01 | YCTENDERD AI Platform for Efficient and Sustainable Operations · tenderd.com | still up |
| 2021-01-01 | YCShepherd Modernizing commercial insurance · shepherdinsurance.com | still up |
| 2020-01-01 | YCSINAI Enterprise software to quantify cost-effective decarbonization… · sinai.com | still up |
| 2022-06-01 | YCPaces Agentic AI for Power Projects and AI Infrastructure · paces.com | still up |
| 2015-06-01 | YCReach Long range, wireless energy distribution that scales · reachpower.com | still up |
| 2020-06-01 | Predictive battery management software for electrified fleets · zitara.com | still up |
| 2024-06-01 | YCautarc autarc is the agentic OS for energy installers. · autarc.energy | still up |
| 2022-06-01 | Engineering the future of chemistry for natural resource extraction · maverickx.com | still up |
| 2019-01-01 | We use solar and wind power to make zero net carbon electrofuels · prometheusfuels.com | still up |
| 2017-06-01 | YCAdvano Advano is a battery technology company that improve the longevity of… · advano.io | still up |
| 2014-01-01 | Enabling li-ion batteries to charge ultra fast without compromising… · gbatteries.com | still up |
| 2022-01-01 | YCKorrAI Traceable AI for billion-dollar infrastructure. · korrai.com | still up |
| 2022-01-01 | Software to find the best sites for renewables on the electrical grid · niraenergy.com | still up |
| 2017-06-01 | YCAirthium Decarbonized heat and power cheaper than fossil fuels · airthium.com | still up |
| 2021-06-01 | Low-cost, high-scale EV charging platform for apartments (and more). · heycharge.com | still up |
| 2021-06-01 | YCFerveret Nuclear-inspired cooling that turns wasted power into more AI compute · ferveret.com | still up |
| 2015-06-01 | Reliable and affordable solar energy in developing countries. · sunfarmer.org | still up |
| 2023-06-01 | YCdili Automating Compliance for Construction · dili.com | still up |
| 2021-01-01 | YCAurabeat Providing clean, safe, virus free air for homes, buildings and cars · aurabeattech.com | still up |
| 2022-01-01 | YCPosh Rapidly deployable energy solutions for modern commercial and… · poshenergy.com | still up |
| 2022-01-01 | AI-driven HVAC control system for improved energy performance · axross.co | still up |
| 2022-01-01 | YCEmobi A single point integration for secure and automated EV charging. · emobi.ai | still up |
| 2016-01-01 | YCCarbic using ultrasonics + ml to analyze fluid behavior at infrastructure… · carbic.com | still up |
| 2021-06-01 | YCEndla Software that increases the value of oil & gas wells · endla.com | still up |
| 2015-06-01 | We design and manufacture energy efficient LED lighting fixtures for… · thriveagritech.com | still up |
| 2023-06-01 | YCNectar Manage energy cost & usage with AI for facility & sustainability teams · nectarclimate.com | still up |
| 2022-06-22 | shopify.com | still up |
| 2023-01-01 | YCCoperniq Workflow software for solar & energy contractors ☀️😎 · coperniq.io | still up |
| 2019-06-01 | Building flying wind turbines. · kitekraft.de | still up |
| 2025-01-01 | Fusion reactors for ships · maritimefusion.com | still up |
| 2026-06-01 | YCTorus Legora for physical engineering firms · usetorus.com | still up |
| 2023-06-01 | Tracking methane emissions with satellites · orbio.earth | still up |
| 2024-09-01 | YCCuro Electric fleets park and charge anywhere with Curo · curocharging.com | still up |
| 2024-06-01 | YCSilurian Foundation models to simulate Earth, starting with weather. · silurian.ai | still up |
| 2024-01-01 | YCSpark AI-powered workflows for energy infrastructure · sparkhq.ai | still up |
| 2024-06-01 | YCIonworks Simulation software used by leading battery and automotive companies · ionworks.com | still up |
| 2022-02-09 | johnjonesfour.com | still up |
| 2026-06-01 | YCMarengo AI-Native Engineering Firm designing Data Centers · marengox.com | still up |
| 2017-01-01 | YCNuvola Nuvola is transforming battery manufacturing, making EV batteries… · nuvola.tech | still up |
| 2022-06-01 | YCEvoly Smart electric & water meters as a service · evolyenergy.com | still up |
| 2024-06-01 | YCPlume Renewable infrastructure deployment at scale. · plumefinder.com | still up |
| 2026-06-01 | We turn waste gases into supply-secure chemicals · rise-reforming.com | still up |
| 2026-01-01 | YCRoboDock Robots that run autonomous depots for autonomous fleets. · robodock.tech | still up |
| 2026-09-01 | YCTalos Predictive maintenance for power infrastructure. · talos-us.com | still up |
| 2026-01-01 | Software for enterprise energy procurement. · condor.energy | still up |
| 2026-09-01 | Embodied Scientific Intelligence · superradiant.co | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.