Changes in the
exchange rate are making wind farm proposals uneconomic and
relying on them to meet the growing demand for electricity in
this country was unwise, an economist told a special tribunal
hearing yesterday.
The recent substantial drop in the New Zealand dollar had
"adversely affected the commercial viability of all proposed
wind farms and would have made many, if not all, uneconomic
at the current exchange rate," economic consultant Philip
Donnelly, of Christchurch, said.
Most wind turbines had to be imported and the cost had
increased due to international demand, he said.
He was giving evidence on behalf of Pioneer Generation on an
application to amend the water conservation order on the
Nevis River.
A special tribunal, appointed by the Ministry for the
Environment, has heard 11 days of evidence on the matter and
will decide whether the order should be changed, so damming
of the river is banned.
Power company Pioneer Generation has plans for a
hydro-electricity scheme on the river and has opposed the
change.
The existing order allows hydro development to be considered.
Mr Donnelly disputed evidence given by former minister of
energy, David Parker, earlier in the hearing, that there were
sufficient proposed wind and geothermal generation projects
to meet the country's increasing electricity needs.
A hydro scheme on the Nevis would contribute an
"insignificant" amount of extra generation, Mr Parker said.
"I consider the high dominance of wind farm projects in
respect to new proposals is of particular concern in meeting
the growing demand for electricity," Mr Donnelly said.
Some would not proceed as they were uneconomic.
Wind generation required substantial back-up generation to
offset sudden variations in generation due to wind
fluctuation.
Demand for electricity in New Zealand was growing about 150MW
a year, equivalent to the demand of a city the size of
Dunedin.
There were many options other than hydro schemes to meet that
growth, but a lot were likely to be uneconomic or result in
power price increases, Mr Donnelly said.
A scheme on the Nevis would provide low-cost electricity
generation, most of which would supply the Central Otago and
Queenstown-Lakes districts. Any extra would go into the
national grid.
It would also secure supply for the wider region, which was
important for industry.
