You asked about Fusion Energy
10 people built something like it. 1 is gone.
That is 13% of the ones whose fate we could settle, against 23% across the whole register. 2 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | Mobile Energy Storage Technology · moxionpower.com | gone |
| 2021-01-01 | YCGridware Protecting the grid today, preparing the grid for tomorrow · gridware.io | still up |
| 2021-01-01 | YCEnode Energy Orchestration Platform · enode.com | still up |
| 2021-01-01 | YCShepherd Modernizing commercial insurance · shepherdinsurance.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 |
| 2021-01-01 | YCAurabeat Providing clean, safe, virus free air for homes, buildings and cars · aurabeattech.com | still up |
| 2021-01-01 | Electricity price forecasts for energy storage, ev charging, etc. · inbalanceresearch.com | acquired |
| 2021-06-01 | YCEndla Software that increases the value of oil & gas wells · endla.com | still up |
| 2021-09-15 | fusionhq.co | unverified |
| 2021-06-01 | Reducing energy costs & emissions in buildings. · kapacity.io | acquired |
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.