Plant Description
Caliraya Hydroelectric Power Plant is the first power plant ever built by NPC. Commissioned in 1942, this facility shares Caliraya reservoir with Kalayaan. CBK PCL rehabilitated the plants waterway, powerhouse, auxiliary equipment and structures and was completed in 2002. Download Brochure
Plant Components
INTAKE STRUCTURE
is located on the left bank of the reservoir at El.272.5 m. From the intake until the surge tank; water is conveyed through a circular, reinforced concrete, 2.5 m-diameter conduit.
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SURGE TANK
is of the Johnson differential type, 6.1m-diameter and raises 32.9-m above the foundation. There is a 2.3 m-diameter maintenance butterfly valve immediately downstream of the surge tank.
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PENSTOCK
A 741 m x 2.0 to 2.3 m diameter, conveys the water to the powerhouse. The penstock is supported on concrete saddles and anchor blocks. A manifold diverts water into two branches and feeds each of the units. A butterfly valve is installed upstream o[..]
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POWERHOUSE
contains two Francis vertical turbines and synchronous generator with a total guaranteed capacity of 22.6 MW. The generators are connected to the main and transfer buses in the substation through SF6 gas-type circuit breakers rated 1,250A. Two transf[..]
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GENERATORS
There are two feeders connecting Kalayaan and Botocan 115 KV line, each one equipped with a de-ton grid circuit breaker. These feeders supply power through two 3-phase power transformers each rated at 22,000 kVA, 13.2 KV / 115KV
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CALIRAYA RESERVOIR
is located approximately 60 aerial km east-southeast of Manila. It serves as the reservoir for the Kalayaan and Caliraya Power Plants. It was formed by blocking the Caliraya River with a dam. It has a total catchment of 129 sq km including the 37 sq [..]
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