You asked about Energy Storage
123 people built something like it. 20 are gone.
That is 18% of the ones whose fate we could settle, against 23% across the whole register. 10 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | Mobile Energy Storage Technology · moxionpower.com | gone |
| 2019-01-01 | We use solar and wind power to make zero net carbon electrofuels · prometheusfuels.com | still up |
| 2014-01-01 | Enabling li-ion batteries to charge ultra fast without compromising… · gbatteries.com | still up |
| 2017-06-01 | YCAdvano Advano is a battery technology company that improve the longevity of… · advano.io | still up |
| 2017-06-01 | YCAirthium Decarbonized heat and power cheaper than fossil fuels · airthium.com | still up |
| 2022-01-01 | YCPosh Rapidly deployable energy solutions for modern commercial and… · poshenergy.com | still up |
| 2021-01-01 | Electricity price forecasts for energy storage, ev charging, etc. · inbalanceresearch.com | acquired |
| 2019-06-01 | SaaS that helps renewables & energy storage operate more profitably · gaia-scope.com | acquired |
| 2024-01-01 | YCSpark AI-powered workflows for energy infrastructure · sparkhq.ai | still up |
| 2024-01-01 | Batteries and solar for $0 upfront to help businesses save money · vistapower.com | still up |
| 2020-06-01 | YCOneKey Find the most profitable sites to build EV charging station · getonekey.io | gone |
| 2023-01-01 | YCAtmeto We develop ML that optimizes how batteries in the grid store energy · atmeto.com | still up |
| 2022-01-01 | First commodity marketplace for hydrogen. · phoenixhydrogen.com | gone |
| 2022-03-17 | liveblocks.io | still up |
| 2022-10-17 | dolpin.io | still up |
| 2026-08-28 | wilsonharper.net | unverified |
| 2016-01-01 | AI + Robotics for the Built World · geckorobotics.com | still up |
| 2015-06-01 | YCOolu Oolu is one of the fastest growing off-grid solar firms in West Africa · oolusolar.com | acquired |
| 2015-01-01 | YCZeitview Inspection software for renewable energy & sustainable infrastructure · zeitview.com | still up |
| 2020-06-01 | YCStatiq. India's Largest EV charging network · statiq.in | still up |
| 2026-08-24 | picomq.com | unverified |
| 2014-06-01 | Building the world's first fusion power plant · helionenergy.com | still up |
| 2022-02-06 | apps.microsoft.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 |
| 2021-01-22 | userbase.com | still up |
| 2022-01-01 | First electric business aircraft designed for hydrogen propulsion · beyond-aero.com | still up |
| 2021-06-01 | YCStownest Flexible On-Demand Storage Space for Household, SMEs & Travellers. · stownest.com | 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 |
| 2018-06-01 | YCTENDERD AI Platform for Efficient and Sustainable Operations · tenderd.com | still up |
| 2023-01-01 | YCRUUF Managed marketplace for solar in Latam · ruuf.cl | 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 |
| 2014-06-01 | YCOklo Emission free, always on power from advanced fission power plants. · oklo.com | acquired |
| 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 |
| 2017-06-01 | Sunfolding builds next generation infrastructure for solar farms. By… · sunfolding.com | gone |
| 2023-06-01 | YCHyLight Unmanned airships for inspecting our critical assets · hylight.aero | still up |
| 2026-09-05 | theopenlake.com | unverified |
| 2016-01-01 | Data management platform for oil & gas assets · mineralsoft.com | acquired |
| 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 |
| 2022-01-01 | YCKorrAI Traceable AI for billion-dollar infrastructure. · korrai.com | still up |
| 2021-04-29 | airbox.ai | still up |
| 2020-01-01 | YCPowerX AI powered sensors that save energy, water and emissions · powerx.co | acquired |
| 2022-01-01 | Software to find the best sites for renewables on the electrical grid · niraenergy.com | still up |
| 2021-06-01 | Low-cost, high-scale EV charging platform for apartments (and more). · heycharge.com | still up |
| 2022-11-07 | playground.unweave.io | gone |
| 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 |
| 2018-06-01 | Database for AI · activeloop.ai | 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 |
| 2021-02-12 | teams.cubbit.io | still up |
| 2021-06-01 | YCHeimdal Affordable and verified direct air carbon capture and storage · heimdalccu.com | gone |
| 2017-06-01 | YCNextDrop NextDrop is the water marketplace for urban India. We connect water… · thenextdrop.com | gone |
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.