Lamma Power Station Solar Power System

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Content

Project Background

Site Selection

Amorphous Silicon Thin Film Photovoltaic System

Environmental Benefits

Challenges

Project Schedule

Summary and Way Forward

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Project Background To widen the use of renewable energy in

HK Electric’s power generation system in support of government policy.

To explore the introduction of commercial scale solar energy project following the success of commissioning the first wind turbine in providing green electricity.

To partner with DuPont Apollo Limited in studying the feasibility of installing large scale PV System in Lamma Power Station.

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Site Selection - Considerations Large flat area for solar PV

installation on ground or roof top

The total weight of solar panels and supports against allowable roof loading

Orientation of solar panels – facing south and tilted at 22º

Full utilization of sunlight with no shading

Visual impact

Ease of grid connection

Accessibility for operation & maintenance

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Site Selection - Installation Locations5 groups on rooftops of Main Station Building & 1 group near C.W. Intake no. 2

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Amorphous silicon photovoltaic module – 5,500 pieces

Total Area of PV modules – 8470 m²

Maximum output of each PV module – 100 W

Total installed Capacity – 550 kW

Capacity Factor – 12.9%

Anticipated power output – 620,000 kWh

Design life – 20 years

Project Cost – HK$23 million

Amorphous Silicon Thin Film PV System – Technical Information

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Amorphous Silicon Thin Film PV System – Characteristics and Benefits1. Use less energy for production

The more silicon is used for production of PV panels, the more energy is required. Thin film PV technology uses less silicon. Thickness is only about 1/200 of that for crystalline PV module.

2. More suitable in tropical environment

Thin film PV maintains better power output level at high temperature than crystalline PV.

3. Better weak light performance

Thin film PV modules are able to effectively produce power at low irradiance conditions.

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Amorphous Silicon Thin Film PV System – Power output in response to solar irradiance variation

Power Output: 18/7/2010 (Sunny) – 3,582 kWh, 22/7/2010 (Cloudy & Rainy) – 1,258 kWh

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● Fully Automatic Operation

With solar irradiance of 100 W/m² and the output voltage of PV

string at 360V, the system connects to the grid automatically.

● Simple Maintenance

General cleaning required under normal circumstances.

Power output not affected even with minor cracks on surface of PV

modules.

Amorphous Silicon Thin Film PV System – Operation & Maintenance

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Environmental Benefits

Reduce 520 tonnes of CO2 emission per annum

Reduce 2.9 tonnes of SO2 emission per annum

Reduce 1.4 tonnes of

NOx emission per annum

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Challenges1. Retrofitting large scale solar power system in existing power plant

– locating large flat areas without any shade to set up PV modules, while not affecting plant operations.

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Typical HK Electric’s Solar Power System

Mounting of modules

Metal structure fixed by anchored bolts

Concrete blocks freely stand on the roof to avoid damage to water-proofing layers

Wind Pressure

2.4 kPa / m²

(No stiffeners)

5.6 kPa / m²(Stiffeners added)

Challenges2. Mounting the PV panels firmly at the selected sites without damaging

water-proofing layers on rooftops and wind pressure on PV panels.

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Challenges3. Delivering large quantities of equipment and materials to rooftops.

11,000 concrete blocks for fixing of PV modules

5,500 Solar Panels47 PV inverters, 47 combiner boxes, 25 Electrical and instrument panels

100,000 metres of cables and cable supports 21,888 angle steel brackets for fixing of PV modules onto the concrete blocks

250 Ton crane for lifting of materials to EL+80.15 roof areas

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4 – 9/2009 Site investigation and study

10 & 11/2009 Tendering

12/2009 – 3/2010 Design

4 – 6/2010 Construction, testing & commissioning

End 6/2010 Project Completion

Project Schedule

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Summary and Way Forward

550 kW

Lamma Power Station

Completed in 2010

Amorphous Silicon Thin Film

350 kW

EMSD Headquarter

Completed in 2005

Crystalline Silicon

198 kW

Hong Kong Science Park

Completed in 2005

Crystalline Silicon

● It is the largest solar energy system in Hong Kong.● More solar panels are planned to be installed on the rooftops of the

New Store Building and existing 275 kV Switching Station. ● The long term target is to expand the total capacity of the system to

1 MW.

Thank You