"Lower milk prices contributed to decreases in both the input and output producers price index in the June quarter," Statistics NZ prices manager Chris Pike said.
In the June quarter, the output dairy product manufacturing price index fell 2.9 percent, reflecting lower prices for milk powder.
Cheaper electricity prices also weighed, with the input electricity and gas supply price index down 8.4 percent due to lower prices for electricity generation. Lower electricity prices reflect spot-market conditions, a shift towards geothermal production over thermal gas-fired generation and higher lake levels, the statistics agency said.
On an annual basis, producer output prices were up 2.5 percent while input prices rose 1.4 percent.
In a separate release, the capital goods price index, which measures changes in the price of new fixed assets bought by local producers, rose 0.7 percent in the second quarter for an annual rise of 2.2 percent. That was led by a 1.3 percent increase in residential building and a 1.1 percent increase in non-residential buildings.
The quarterly capital goods increase was partly offset by a fall in the prices for plant, machinery, and equipment, which declined 0.3 percent as a result of an increase in the New Zealand dollar.
Read the full Producers Price Index report here: