I logged in and found the solar facility registration page. It appears to be up on my end.
You'll need to log in first to access this link.
https://solarcoin.org/node/add/solar_facilityTo be more clear. The website has been updated recently, and the wallet is currently in transition (new version on the way). The claim link inside the wallet will be different in the new wallet, things are in between development at the moment.