You asked about Energy Storage
14 people built something like it. 3 are gone.
That is 23% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-01 | YCPosh Rapidly deployable energy solutions for modern commercial and… · poshenergy.com | still up |
| 2022-01-01 | First commodity marketplace for hydrogen. · phoenixhydrogen.com | gone |
| 2022-01-01 | First electric business aircraft designed for hydrogen propulsion · beyond-aero.com | still up |
| 2022-06-01 | YCPaces Agentic AI for Power Projects and AI Infrastructure · paces.com | 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 |
| 2022-01-01 | Software to find the best sites for renewables on the electrical grid · niraenergy.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 |
| 2022-01-01 | Unlocking Virtual Power Plants for rental properties · glowenergy.com | acquired |
| 2022-01-01 | YCPelm Plaid for utilities · pelm.com | gone |
| 2022-06-01 | Claim solar incentives with AI · jasmine.energy | gone |
| 2022-06-01 | YCEvoly Smart electric & water meters as a service · evolyenergy.com | still up |
| 2022-06-01 | YCPoly Intelligent Personal Cloud Storage · poly.app | still up |
How this compares
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.