This site recently covered how the TPPA could impact on the smart meter situation in NZ.
Basically, if the government signs the TPPA the smart meter situation could get much worse. For more details see: https://stopsmartmeters.org.nz/latest-news/how-the-tppa-might-torpedo-sensible-laws-to-protect-people-smart-meters/
If you oppose the TPPA there is a petition that you can sign at this link: http://www.theawarenessparty.com/tppa-petition/
At the link below you may sign up for an email list to learn about the TPPA and how you can help the campaign against it: http://itsourfuture.org.nz/