1. You would have to cancel ur current port authority ezpass account ,best to do it in person at one of their walk-in centers.
2. Open up new account online since your address should automatically default to the NyS thruway ezpass account.
3. Once account has been opened and confirmed that it is indeed a Nys thruway account. Submit paperwork via fax or snail mail. They don't do emails..... I did snail mail after so many failed attempts at fax which I sent to all the both address's that I could find on ezpass one to the new account application address. Pobox 149001 Staten island ny and one to Nys Thruway ezpass listed on their site to pobox 15187 Albany NY....cust acct correspondence. I sent proof of nys reg with cover letters clearly indicating my nys thruway ezpass acct number and request for green pass.
Sent 2 times to each address with delivery and signature confirmation. After about month, unfortunately over Christmas and new years, I finally received me green pass.
U can use the port auth one and just add both plans but u will get charged the $1 monthly service fee.....I changed over just because of principle Lol. Don't want to get charges if I can get it for free