The Lake Hawea control gates and dam, above the Hawea
River. Photo by Matthew Haggart.
Contact Energy has asked for more time to establish a
hydroelectric scheme at Lake Hawea, citing the global economic
downturn and seasonal construction constraints as reasons for
the delay in exercising the project's original consent.
Contact has proposed the construction and operation of a
small-scale hydro-generation facility in the outfall control
structure of the existing Lake Hawea dam.
It secured an original land use consent from the Queenstown
Lakes District Council in 2007 for the 17.2MW Hawea Gates
Generation Project, due to lapse on February 7.
Contact also holds associated consents granted by the Otago
Regional Council with expiry periods of 10 and 15 years,
lapsing on various dates in 2017 and 2022. It wants to extend
the expiry date of the QLDC consent another five years, to
July 16, 2017, to coincide with the regional council
Contact hydro-development project manager Neil Gillespie
said, while Contact was "continuing to progress, giving
effect to the consent", it was not possible to complete the
final design and construction of the project within the
current QLDC consent period.
The extension application said a combination of "technical,
practical and economic constraints" were behind the delay.
The project was not straightforward as it involved
"retrofitting a modern tailor-made generation plant to
existing infrastructure", making the economic risks of
project high, the application stated.
A final investment decision could not be made by the current
lapse date, a situation "exacerbated by the global economic
downturn and associated slower-than-anticipated growth in
electricity demand since 2008".
Also, because initial construction work had to be performed
"in-river", the project was limited by the ORC consents and
seasonal constraints, which had contributed to its extended
The project requires modifying the Hawea dam structure, on
Contact-owned land, by constructing twin powerhouses;
installing a generation plant; altering the intake structure;
installing penstocks through the existing sluices;
strengthening some existing works; and carrying out
earthworks and upgrades to access roads.
Mr Gillespie said the extension would help achieve the
objectives of the QLDC district plan and was an efficient and
sustainable use of the resources.
"It's a great little project, renewable, small scale, and
makes the most of an untapped resource, the water already
being spilled through the dam.
"Importantly, the development involves no long-term changes
to the river environment."
It would take up to 36 months to complete the final design
and construction, and the expected timeframe to complete all
work is no later than 2017, in line with the current ORC
Contact was "still working through [geotechnical]
information" on the four other Clutha River locations
identified as options for hydroelectric dams - Luggate,
Queensberry, Beaumont and Tuapeka Mouth - Mr Gillespie said.