Environmental Impact Statement for the Alimit Pumped-Storage Project (2018)

An Environmental Impact Statement (EIS) was prepared for the 250MW Hydropower Plant by SN Aboitiz Power – Ifugao, Inc, (SNAPI). The project is a 53.61-hectare property located in Barangays Olilicon and Tupaya in Lagawe, Ifugao which is considered an environmentally critical area. The Alimit Pumped-Storage Project is in line with the Department of Energy’s endeavors to accelerate the development of renewable energy resources and will help address the electricity demand in Luzon.

As part of the preparation of the EIS, Aperçu Consultants Inc. was engaged in the following activities:

Land Module

Land Use Classification

Reviews of the Comprehensive Land Use Plan (CLUP) and satellite imagery complemented with ground truthing mapping were used to assess if the project was in line with the land use of the area. 


Soil samples were collected from representative stations in the project site and analyzed in the laboratory. Results provided insights on the potential impacts of the project’s activities to the pedology of the site.

Geology and Geomorphology

Geologic characteristics and various hazard maps were assessed to see potential hazards and its impacts on the project.

Terrestrial Ecology 

Vegetation and fauna assessments were done to identify critical species (endemic, threatened, or vulnerable) as well as to serve as a basis when monitoring for changes in species due to project activities.

Water Module


Physical characteristics and flows of the Alimit River based on the drainage system and delineated watershed were used to assess the potential of the project to induce flooding or deplete local water resources. Outcomes of the assessment were used to manage and mitigate potential adverse impacts.

Water Quality

Surface water and groundwater were assessed for the baseline conditions of the watercourses to serve as a basis for monitoring future impacts of the project on the surface and groundwater quality.

Freshwater Ecology

Physical characteristics and biological communities (algae, zooplankton, benthic macroinvertebrates, and fish) were assessed to see the general conditions of the freshwater environment and determine potential impacts from the construction to operation of the project.

Air Module

Ambient Air Quality

Air dispersion modeling was done to assess impacts of construction to the ambient air. Air samples were collected and analyzed. The results were used to inform all future air quality and track the project’s compliance with the Clean Air Act.  

Ambient Noise

Existing sonic profile and noise impacts of the construction phase were compared to see if sound levels were within Environmental Quality Standards for Noise in General Areas.

People Module


Impact assessments were focused on the resources most affected by the project from its pre-construction, construction, and operational stages. 

Health Study

A health impact investigation was done to identify risks and rank them for its probability to occur and the severity of its impact. 

Cultural Heritage

Baseline heritage conditions were assessed and the potential impacts were evaluated in order to mitigate potentially adverse impacts, where appropriate.

Traffic Study

Existing transportation and traffic situation in the vicinities of the project site were evaluated to mitigate potentially adverse impacts and assess site accessibility.

Environmental Risk Assessment

All possible risks associated with the project as well as the probability of occurrence of accidents and their magnitude were assessed. Results from the assessment were used avoid and reduce consequences of the project’s activities.

The Environmental Compliance Certificate (ECC) for the project was issued by the Department of Environment and Natural Resources (DENR) on November 2018 with ECC Reference No. ECC-CO-1603-0011. The ECC is available at the following link.

A copy of the Environmental Impact Statement is available at the Environmental Management Bureau (EMB) website at the following link.