Maris South Canal Hydro Electric Power Project (HEPP)

Customer: SNAP

Location: North Luzon, Philippines

Contract: Construct Only

Project Capabilities

Mechanical Civil Hydropower & Dams Mechanical Hydropower & Dams


The Maris South Canal Hydro Electric Power (HEPP) project is an 8.5MW low head hydroelectric power station. The station utilizes 2 x 4.25 Kaplan turbines pits, which were constructed downstream to the existing Maris Reservoir on the south bank of the Magat River in North Luzon, Philippines.

McConnell Dowell has a long-standing relationship with the client Statkraft Norfund Power Investment Group and Aboitiz Power (SNAP). SNAP are the owners of the existing Ambuklao Hydro Power Plant in the Philippines. We have successfully worked together for over 10 years and we continue to develop our strong working relationship, through most recently being award the Maris Dam Regulation Gates contract

The run-of-river plant utilizes water from the Maris Reservoir, re-regulating the dam downstream on Magat River. The 360MW Magat hydroelectric power station discharges into the Maris South Canal.

Scope of work included the construction of:

  • Upstream and downstream cofferdams
  • Large intake and headrace structures
  • A 21m high reinforced concrete powerhouse structure housing the turbine units/generators and ancillary equipment
  • Tailrace canal and irrigation diversion canal
  • Design, fabrication and installation of hydromechanical steelwork
  • Design, construction, installation and commissioning of building related equipment and balance of Plant

Regulating Gates Project

The Regulating Gates contract was awarded to McConnell Dowell due to our strong working relationship on the Maris South Canal HEPP contract.

Maris Dam is located on the Magat river, approx. 6 km downstream of the 360MW Magat Hydropower Plant. The main purpose of the Maris Dam is to store and supply water for two irrigation canals, the North Diversion Canal (NDC) and the Maris Main Diversion Canal (MMDC). The Maris reservoir water level is controlled by 32 stoplogs installed on the dam crest, which is dependent on the season and the water level in the Magat reservoir.

The project involves the alteration of 2/16 bays of wheeled stoplogs at the bottom opening. Once the regulating gates are completed they can be mechanically raised or lowered, allowing more control to water levels, manage spills from the Maris Reservoir and water flow from the 8.5MW Maris South Canal HEPP. 

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