"It's a broader move than just kiwi-specific and it looks like the [US] dollar has just perked up a bit," he said. There are "a lot of expectations and tensions" around Powell's testimony pushing the dollar around, he said.
The Federal Open Market Committee is expected to raise interest rates at its March meeting and at least two other times this year, according to the latest forecasts.
Speizer also noted Powell will face questions and answers and there will likely be at least one pointed question about his latest views on the projected rate path but he is "unlikely to give away anything new" and it may end up being quite a neutral affair for markets.
New Zealand's two-year swap rate rose 2 basis points to 2.17 per cent while 10-year swaps were unchanged at 3.20 per cent.
The trade-weighted index was at 74.62 from 75 yesterday. The local currency traded at 52.12p from 52.28p yesterday and fell to 59.04 euro cents from 59.43 cents. It decreased to 77.84 yen from 77.96 yen yesterday, and fell to 4.5889 Chinese yuan from 4.6204 yuan.