She did not mention the spy base in her speech, though she alluded to the "complicated" relationship that has existed between the party and the committee.
"For almost 20 years, Green Party MPs have been calling in this House for this committee to be reformed, for it to much more closely reflect other select committees in Parliament in transparency, in accountability, and membership, for it to move away from operating as a secret meeting," she said.
She added that the Greens would bring a healthy scepticism to the committee, but also promised to behave.
"We will bring cautious and, at times, sceptical scrutiny of the committee's work and the spy agencies' activities. We will also treat our responsibility on the committee with appropriate discipline and the code of conduct that is required".
Five days ago, Ghahraman joined the annual protest at GCSB base in Waihopai.
"So the Green Party policy remains to shut down the base," Ghahraman told the protest.
"We have to keep up our voices because it does matter. It is hurtful to us as humanity to have things like this happen, so I will be keep a loud voice on that."
Three activists managed to infiltrate in 2008 and deflate one of the dome covers of one of the satellite dishes.
Following a jury acquittal of the trio, then-director of the GCSB Sir Bruce Ferguson and his predecessor Warren Tucker released a statement saying the station was not a spy base contributing to, in the words of the activists, "unspeakable evil".
"It was not - and is not - contributing to 'unspeakable evil'. Quite the reverse."