PRELIMINARY PROJECT INFORMATION MEMORANDUM

Project Objective The project concerns structuring and transacting turbines 4 & 5 of the Angat HEPP facility potentially on a PPP basis. The primary objective of Metropolitan Waterworks & Sewerage System (MWSS) is to select a private partner under PPP framework for Rehabilitation, Operation and Maintenance of the units.

Project Overview

The is a multipurpose reservoir with benefits of irrigation, water supply flood control and hydro power. The reservoir supplies about 90 percent of raw water requirements for Metro Manila through the facilities of the Metropolitan Waterworks and Sewerage System (MWSS). It irrigates about 28,000 hectares of farmlands in the provinces of and Pampanga under the service area of Angat Maasim River Irrigation System (AMRIS) of the National Irrigation Administration (NIA). During the rainy season, the dam serves as a flood control facility where the reservoir serves as a buffer for the increased water inflow in the watershed catch basin. The Plant is located at San Lorenzo, , Bulacan to the west of the Sierra Madre mountains.

Angat Reservoir Angat Powerhouse

The integrated Powerhouse complex of the project consists of 2 Power station namely the main and auxiliary. The main power station is installed with 4 Nos. 50 MW hydro electric generation capacity and the auxiliary power station is installed with 3 Nos.6 MW, 1 No. 10 MW and 1 No. 18 MW hydro electric generation capacity. Water that passes through the main turbines exits through a tailrace tunnel 1,800 meter in length and joins the downstream of . Water that drive the auxiliary turbines exits directly through the

1 original Angat river to Ipo dam where it is being used for domestic water supply by means of the Ipo‐La Mesa Aqueducts.

Fig 1 : Power Plant Layout and Water Inflow

The facilities of Angat dam and main power station (200 MW) was completed in the year 1968. The auxilliary units of the power house were commissioned as per the following schedule: 1. Auxiliary Unit # 1 : July 1967 2. Auxiliary Unit # 2 : July 1967 3. Auxiliary Unit # 3 : October 1978 4. Auxiliary Unit # 4 : June 1986 5. Auxiliary Unit # 5 : January 1993

The auxiliary units 1,2 and 3 are owned, operated and maintained by National Power Corporation(NPC). The auxiliary units 4 and 5 are owned by MWSS but is operated and maintained by NPC under an operation and maintenance agreement with Power Sector Assets and Liabilities Management Corporation (PSALM).

The project concerns structuring and transacting turbines 4 & 5 of the Angat HEPP facility potentially on a PPP basis. The objective of this transaction services is to select a private partner under PPP framework for Rehabilitation, Operation and Maintenance of the units.

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AHEPP Operating Context and Water Allocation

The water allocation for the Angat Dam shall be in accordance with the water allocation approved by National Water Resource Board (NWRB). NWRB is the government body mandated to regulate water allocation among the relevant agencies such as MWSS, NIA and NPC. NWRB mandates the order of priority on water usage such as Potable Water Supply, Irrigation Supply, Domestic Supply andPower Generation. The current water allocation to MWSS is 46 cms.

Technical features

The key technical features of Auxiliary Units 4 and 5 are detailed below:

Table 1 : Technical Features

Auxiliary Unit #4 Auxiliary Unit # 5 Turbine Type Francis, Vertical Shaft Francis, Vertical Shaft Rated Capacity 17000 HP 24000 HP Rated Net Head 102 m 110 m Rated Flow 7.03 Cumecs 22.00 Cumecs Normal Speed 600 rpm 400 rpm Runaway Speed 1140 rpm 770 rpm Manufacturer Allis Chalmer/Ebara Harbin Electric Machinery China Generator Type Vertical Synchronous Vertical Synchronous Output 10 MW 18 MW Number of Phase 3 3 Voltage 13.8 kV 13.8 kV Rated current 465 Ampere 837 Ampere Frequency 60 Hz 60 Hz Number of Poles 12 18 Manufacturer Shinko Electric Japan Harbin Electric Machinery China Commissioning Date 1986 1993

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Auxiliary Unit #4 Transformer Area/Switch yard

Auxiliary Unit #5 Control Panel Unit # 5

Past Performance Figures Table 2 : Annual Energy Generation in MWh

AHEPP Turbine Unit 4 AHEPP Turbine Unit 5 2002 8,625.90 99,772.22 2003 0.00 54,714.55 2004 88.90 0.00 2005 8,089.90 0.00 2006 35,850.10 0.00 2007 22,559.40 0.00 2008 29,081.80 7,776.00 2009 31,594.70 29,116.80 2010 12,855.30 55,754.40 2011 32,311.40 54,180.00

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