You asked about Solar Power
464 people built something like it. 71 are gone.
That is 16% of the ones whose fate we could settle, against 23% across the whole register. 30 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2015-06-01 | YCOolu Oolu is one of the fastest growing off-grid solar firms in West Africa · oolusolar.com | acquired |
| 2022-04-02 | witch.solar | unverified |
| 2022-01-01 | YCRemi Simplifying roofing for homeowners, roofers and enterprises. · remihq.com | still up |
| 2023-05-16 | jamez.it | still up |
| 2018-06-01 | YCMomentus The space infrastructure services company · momentus.space | acquired |
| 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 |
| 2021-06-01 | Home electrification at $0 upfront cost · solarmente.es | gone |
| 2023-01-01 | YCRUUF Managed marketplace for solar in Latam · ruuf.cl | still up |
| 2017-06-01 | Sunfolding builds next generation infrastructure for solar farms. By… · sunfolding.com | gone |
| 2019-01-01 | We use solar and wind power to make zero net carbon electrofuels · prometheusfuels.com | still up |
| 2022-01-01 | Software to prevent downtime in a solar plant · smarthelio.com | still up |
| 2021-06-01 | Robots that build solar farms · chargerobotics.com | still up |
| 2022-01-01 | Software to find the best sites for renewables on the electrical grid · niraenergy.com | still up |
| 2015-06-01 | Reliable and affordable solar energy in developing countries. · sunfarmer.org | still up |
| 2023-01-01 | YCCoperniq Workflow software for solar & energy contractors ☀️😎 · coperniq.io | still up |
| 2024-01-01 | YCSpark AI-powered workflows for energy infrastructure · sparkhq.ai | still up |
| 2022-06-01 | Claim solar incentives with AI · jasmine.energy | gone |
| 2024-06-01 | YCPlume Renewable infrastructure deployment at scale. · plumefinder.com | still up |
| 2024-01-01 | Batteries and solar for $0 upfront to help businesses save money · vistapower.com | still up |
| 2026-01-01 | Energy independent data centers with solar and repurposed batteries. · voxelenergy.com | still up |
| 2022-06-01 | We enable landlords to generate income from solar panels. · wandsolar.com | still up |
| 2025-01-01 | YCAstro The world’s first AI energy developer · astroenergy.ai | still up |
| 2015-01-01 | AI-powered technology enabler and digital transformer of American… · grubmarket.com | still up |
| 2017-01-01 | YCFaire The global online platform empowering independent retail. · faire.com | still up |
| 2022-06-15 | softr.io | still up |
| 2012-06-01 | Unlocking the power of biotech with modern software for modern science · benchling.com | still up |
| 2015-06-01 | YCIronclad AI-powered contract management · ironcladapp.com | still up |
| 2022-02-22 | snappify.com | still up |
| 2022-05-05 | supermeme.ai | still up |
| 2022-01-03 | menubarx.app | still up |
| 2022-02-23 | meetglimpse.com | still up |
| 2022-10-17 | lex.page | still up |
| 2022-10-19 | teleporthq.io | still up |
| 2021-01-01 | Mobile Energy Storage Technology · moxionpower.com | gone |
| 2023-10-19 | autotab.com | still up |
| 2022-01-20 | truesource.io | gone |
| 2014-01-01 | YCUnbabel AI-powered Language Operations platform · unbabel.com | acquired |
| 2022-10-25 | nextjs.org | still up |
| 2022-11-13 | podcast.adobe.com | still up |
| 2022-07-27 | plgworks.com | gone |
| 2022-12-23 | musings.yasyf.com | still up |
| 2023-03-28 | regex.ai | still up |
| 2022-02-10 | kickstarter.com | unverified |
| 2022-10-03 | exactbuyer.com | gone |
| 2022-07-20 | pollthepeople.app | still up |
| 2022-11-18 | freesubtitles.ai | moved |
| 2021-05-28 | ninfex.com | unverified |
| 2023-06-01 | hnresumetojobs.com | still up |
| 2012-06-01 | YCClever The platform that powers technology in the classroom. · clever.com | acquired |
| 2023-03-01 | future.attejuvonen.fi | still up |
| 2022-06-29 | brevity500.com | still up |
| 2022-04-29 | pixy.com | still up |
| 2022-10-27 | whatthediff.ai | still up |
| 2022-06-23 | marketingminer.com | still up |
| 2022-01-26 | joincandor.com | still up |
| 2022-04-04 | hirequotient.com | still up |
| 2018-01-01 | YCAtrium Modern law firm for startups powered by proprietary technology · atrium.co | gone |
| 2022-10-19 | fillout.com | still up |
| 2022-01-31 | ideas-generator.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.
Older launches have had longer to die, so this slope is expected. A year that broke it would mean something is wrong with the checking.
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.