Esk Hydro Power Scheme

Completed in October 2013 for TrustPower in the Hawkes Bay, the Esk Medium Hydro Civil Works Project comprised the construction of two Run of River Hydro Schemes with a combined generation capacity of 3.8MW. MAP Projects scope included all of the stream intakes, power stations and pipework’s. This work included:

  • Construction of cut to fill earthworks on the Toronui storage Pond and powerhouses. Total volume of earthworks approximately 32,000m3 including 16,000m3 of cut to structural fill
  • Construction of two major penstocks with a combined length of 3.2km and pipe diameter varying from 900mm down to 600mm. The penstocks were laid in GRP (2.1km) and steel (1.1km) and on grades varying up to 51% and invert depths of up to 10m
  • Intake Structures were constructed in a live stream by diverting the water into bypass pipes. Heavy precast sections were fabricated for the inlet box and sluice ramp and the two main weirs were some 62m3 of reinforced concrete each with the top weir on the Rimu stream being 800m above sea level
  • The two powerhouses were constructed with a reinforced concrete base some of which was precast at the main site and skidded down into place. The largest precast element to be lifted was 18t. Each powerhouse used some 80m3 of concrete. The building platforms are around 80m2 and the structural steel frame is 9m high and included a gantry crane at each powerhouse with a load of up to 22 tonnes for the generators.