Binga Dam

Also known as: Binga Hydroelectric Plant · Binga hydroelectric dam · Agno II (second Agno River cascade development)

Definition

Binga Dam is an earth-and-rockfill storage dam on the Agno River at Barrio Binga, Barangay Tinongdan, in the municipality of Itogon, Benguet, Philippines, about 31 kilometers southeast of Baguio City and 19 kilometers downstream of its sister facility, Ambuklao Dam. Built by the National Power Corporation with construction beginning in August 1956 and commissioned in May 1960, the dam impounds an 87.44-million-cubic-meter reservoir and originally supplied a 100-megawatt hydroelectric plant of four Francis turbine units, operating as a peaking plant within the Agno River cascade. (Wikipedia, Norconsult)

After decades of state ownership under the National Power Corporation, the plant’s power components were privatized: SN Aboitiz Power-Benguet won the package bid for Binga and Ambuklao on November 28, 2007, and assumed operations on July 10, 2008, while the dam structures themselves remained government-owned. A rehabilitation and uprating program subsequently raised installed capacity from the original 100 MW to 125 MW by July 2013 and to 140 MW by 2014, partly to recover storage and generation capacity lost to heavy reservoir siltation. (Wikipedia, AboitizPower, International Hydropower Association)

Identities

Source Type	Identity
Wikipedia	Binga Dam
Wikidata	Binga Dam (Q15199326)
DBpedia	N/A
ProductOntology	N/A
Wiktionary	N/A
Library of Congress Subject Headings (LCSH)	N/A
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NCBI Taxonomy	N/A
AGROVOC	N/A
Google Scholar	“Binga dam” Agno river Itogon Benguet hydropower siltation rehabilitation SN Aboitiz Philippines
ConceptNet	N/A
OpenCyc	N/A

Also Known As

Binga Hydroelectric Plant
Binga hydroelectric dam
Agno II (second Agno River cascade development)

Examples and Analogies

The second step of the Agno staircase: the Agno cascade works like a flight of stairs for water — Ambuklao impounds the upper Agno, Binga re-uses the same river water 19 kilometers downstream, and San Roque catches what flows on to the Pangasinan plains — so generation at Binga is tied both to inflows and to releases from Ambuklao upstream. (International Hydropower Association, Wikipedia)
A case study in sediment management: the International Hydropower Association uses Binga as a global sediment-management case study, illustrating how a mid-cascade reservoir loses storage to silt and what operators do about it. (International Hydropower Association)
Verified infrastructure data:
Location: Barrio Binga, Barangay Tinongdan, Itogon, Benguet; 31 km southeast of Baguio
Construction: began August 1956; opened May 1960; built at a cost of about US$18.5 million
Type and dimensions: earth-and-rockfill storage dam, 107.37 meters high, 215 meters long at crest
Reservoir: total capacity 87.44 million cubic meters
Capacity history: 100 MW original; 125 MW after refurbishment completed July 2013; 140 MW after uprating in 2014
Ownership: power assets operated by SN Aboitiz Power-Benguet since July 10, 2008; dam structures remain government-owned

Usage Scenarios

1. Peaking Power Generation

With four Francis units now rated at 140 MW combined, Binga is operated as a peaking plant, releasing stored water to generate during hours of high grid demand and supplying ancillary services to the Luzon grid. (Wikipedia, Global Energy Monitor)

2. Cascade Coordination on the Agno River

Binga’s operation is coordinated with Ambuklao upstream and San Roque downstream as the three-dam Agno cascade supplying 105 MW, 140 MW, and 345 MW respectively, requiring operators to schedule releases in consideration of both generation economics and downstream river conditions. (International Hydropower Association)

3. Reservoir Sediment Management

Because inflowing sediment had significantly reduced the reservoir’s active storage volume, the rehabilitation program included sediment-related works, and the plant’s operation now incorporates the sediment management practices documented in the hydropower industry’s case study of the cascade. (International Hydropower Association, Norconsult)

4. Rehabilitation of Legacy Hydropower Assets

Binga exemplifies the privatization-era rehabilitation model: the 2007 bid, the 2008 turnover, a refurbishment that extended plant life and raised capacity to 125 MW by 2013, and a subsequent uprating to 140 MW — the pathway by which the Philippines’ National Power Corporation-era plants were modernized under private operators. (Wikipedia, AboitizPower)

Strategies

Rehabilitation before replacement: rather than building new capacity, the operators rebuilt the 1960-vintage plant — new intake works, refurbished turbines, and improved spillway capacity — restoring output from a distressed asset. (Norconsult, Wikipedia)
Uprating within existing water rights: recovering megawatts by upgrading unit capacity from 100 to 125 to 140 MW rather than enlarging the dam or reservoir footprint. (Wikipedia, AboitizPower)
Cascade-level planning: managing Ambuklao, Binga, and San Roque as one hydrological system, since upstream sediment and release schedules directly condition downstream generation and flood management. (International Hydropower Association)
Public-private split of assets: privatizing generation while retaining government ownership of the dam structures, a structure designed to attract private capital while keeping strategic infrastructure under state title. (Wikipedia)

Security and Safety Measures

Spillway capacity improvement: the rehabilitation program included improving the spillway, whose tainter radial gates must safely pass extreme flood inflows into the reservoir. (Norconsult, Wikipedia)
Seismic retrofit attention: the dam was heavily damaged by the 1990 Luzon earthquake, and post-earthquake improvements continued in the years that followed, an engineering legacy relevant to dam safety in the Cordillera seismic setting. (Wikipedia)
Sediment monitoring: tracking reservoir storage loss and managing sediment inflows, both to sustain generation head and to preserve flood-buffer capacity in the cascade. (International Hydropower Association)
Government retention of dam ownership: keeping the dam structures under government ownership while a private concessionaire operates the power plant maintains a public counterparty for dam safety accountability. (Wikipedia)

Historical Context

The Agno River developments of the 1950s were among the National Power Corporation’s flagship postwar projects: Ambuklao (commissioned 1956) was the first large dam on the river, and Binga followed as the second step, constructed from August 1956 and opened in May 1960 at a cost of about US$18.5 million. Together the two Benguet plants anchored hydroelectric supply for the Luzon grid for decades, operating under NPC until the electric power industry reform era. (Wikipedia, Norconsult)

Under the government’s power privatization program, SNAP-Benguet — a joint venture of Norway’s SN Power and Aboitiz Power — won the November 28, 2007 bidding for the Ambuklao-Binga package and assumed operations on July 10, 2008; only the power components were privatized, while the dams remained government-owned. The rehabilitation that followed, executed alongside Ambuklao’s own rebuild, restored the aging plant to 125 MW by July 2013 and 140 MW by 2014 — recovering in part the capacity and storage compromised by decades of reservoir siltation, which the International Hydropower Association now documents as a global sediment-management case study. (Wikipedia, AboitizPower, International Hydropower Association)

Challenges and Controversies

Reservoir Siltation and Storage Loss

Decades of sediment inflow from the denuded upper Agno watershed significantly reduced the reservoir’s active volume, degrading both energy production and flood regulation — a problem the operators have addressed through rehabilitation-era works and ongoing sediment management, but which remains the defining constraint on the plant’s long-term output. (International Hydropower Association, Norconsult)

Privatization of the Agno Cascade

The 2007 sale of Binga and Ambuklao to SNAP-Benguet was part of the contested wider privatization of National Power Corporation assets: advocates argued private operators delivered the rehabilitation that the fiscal-constrained state could not, while critics questioned the terms of transferring strategic hydropower assets — a debate sharpened by the hybrid arrangement in which only the power plants were sold while the dams stayed under government ownership. (Wikipedia, AboitizPower)

Seismic Vulnerability in the Cordillera

Binga’s heavy damage in the 1990 Luzon earthquake exposed the seismic risk attending large embankment dams astride the Cordillera’s active tectonics, and the multi-year program of post-earthquake improvements foreshadowed the continuing dam-safety scrutiny applied to the cascade, whose failure would threaten communities along the Agno downstream. (Wikipedia)