She told the assembled parade she was "very thankful" to them for their quick professionalism.
"I just wanted to say, thank you so much - I can't thank you enough."
Ms Powers suffered a brain injury, cut legs, a broken arm and jaw and spent four weeks in a coma.
She featured in the Times-Age Westpac Chopper Appeal publication earlier this month.
She is in a wheelchair, but her goal is to walk again by August.
"I'm good but a bit tired," she said.
"I've been wanting to say thank you for a while, so I got hold of them on Facebook."
She had baked a cake for the fire crew to have after their practice night.
Carterton fire chief Wayne Robinson said they had had to haul the car away from the power pole, then use the chain technique.
"Successful stories like this are few and far between."