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Case study

Harapaki Wind Farm

New Zealand is striding ahead by world standards in becoming a fully renewable energy country. In the past, New Zealand renewables have focused on hydro and geothermal, and now a future shift to wind and solar. Wind farms are well developed across rural new Zealand, with a focus on the Eastern Ranges of the North Island. Meridian Energy’s Harapaki Wind Farm off State Highway 5 in Hawke’s Bay is costing close to NZD450Million with expected completion by 2024. The output is 176MW or 70,000 average households.

What did we deliver?

RDCL completed several geotechnical risk assessments from 2015 to 2018 for the wind farm, focusing on turbine locations developing a risk matrix for proposed foundation designs. Across the investigation RDCL compiled geotechnical drill data, CPT and geophysics, of which a significant portion was all in-house. An electrical resistivity tomography (ERT) survey was completed in Summer 2017 to 2018 across 42 proposed turbine locations to help identity voids and void like ground, which was considered a high geotechnical risk, due to karstic limestone across the hill country.


RDCL deployed locally based Hawke’s Bay staff across three months to complete the ERT survey, completing one site per day and compiling all previous test data to develop the risk assessment and geotechnical model for each turbine site.

Services and tools

Surface Geophysics mapping; electrical resistivity tomography (ERT)
Geological modelling, ground modelling, risk assessments, foundation recommendations

Hawke’s Bay
Te Matau-a-Māui
+64 6 877 1652
8/308 Queen Street East,
Hastings, Hawke’s Bay,
New Zealand
Te Whanganui-a-Tara
+64 4 282 1564
Unit 2, 2 Raiha St, Elsdon,
Porirua 5022, Wellington,
New Zealand.
Tāmaki Makaurau
+64 21 884 190
Unit A3, 269a Mount Smart Rd, Onehunga, Auckland 1061, New Zealand.
+63 916 276 3133 (Admin)+63 917 184 5147 (Technical)
Unit 2106, Prestige Tower,
F. Ortigas Jr. Road, Ortigas Center, Pasig City 1605, Metro Manila, Philippines.