1

ENHANCING CAPABILITY OF HYDRO POWER IN THAILAND

Mr. Chatchai MawongDirector, Hydro and Renewable Energy Power Plant Development Division

Electricity Generating Authority of Thailand

EGAT Business

Ref: EGAT Annual Report 2019

Generation Transmission Power PurchaseTo solely operate the transmission system. (Main voltage levels 500, 230, 132, and 115 kV.)

To purchase bulk electricity from IPPs and SPPs and from neighboring countries, i.e. Lao PDR and Malaysia.

To generate electricity by more than 50 power plantslocated in different parts of the country.

Affiliates

35,981.449 Circuit-Kilometers

Transmission Line Length

To invest in electricity generation and energy-related businesses in the following 5 affiliates.

16,034.83 MW

Installed Generating Capacity

30,167.42 MW

Contract Capacity

34,290.40 Million Baht

EGAT’s Investment

Thailand System Generating Capacity

Ref: EGAT Power System Control and Operation Division

EGAT 35.21 %16,034.83 MW

IPPs31.28 %14,248.50 MW

SPPs20.95 %9,539.94 MW

Foreign 12.56 %5,720.60 MW

Thermal 22.98 %3,687.00 MW

Combined cycle 51.53 %8,262.00 MW

Other (Lamtakong Jolabha Vadhana and Diesel)

6.43 %1,030.40 MW

Renewable19.06 %3,055.43 MW

EGAT’s Power PlantSystem Installed Generating Capacity in 31 July, 2020

45,543.87 MW

Renewable Capacity (MW)

1. Hydro Power Plant 3,021.632. Wind, Solar, Geothermal 33.8

Total 3,055.43

Status of Hydro Power

Projects Capacity (MW)

1. Bhumibol Dam 779.2

2. Sirikit Dam 500

3. Ubol Ratana Dam 25.2

4. Sirindhorn Dam 36

5. Chulaphorn Dam 40

6. Srinagarin Dam 720

7. Vajiralongkorn Dam 300

8. Thathungna Dam 39

9. Kaeng Krachan Dam 19

10. Bang Lang Dam 84

11. Rajjaprabha Dam Unit 240

12. Pak Mun Dam 136

13. Small Hydro Power Plant (<10 MW) 17.78

14. Irrigation Dams 85.45

Total 3,021.63

Currently, EGAT has been developed hydro projects more than 50 years. It started with large hydro power plant and later more developed in small hydro power plants and downstream irrigation dams

3,021.63 MW

Ref: EGAT Power System Control and Operation Division

Larg

e H

ydro

Status

The large hydro plants are likely limited the development of new capacity caused by high CAPEX cost and increased environmental consciousness. There are only 3 new hydro power plant projects in PDP 2018 with total capacity of 34.5 MW as follows:

Hydro Power Plant Project: Large and Small Hydro

Projects Capacity (MW)

1. Bhumibol Dam 779.2

2. Sirikit Dam 500

3. Ubol Ratana Dam 25.2

4. Sirindhorn Dam 36

5. Chulaphorn Dam 40

6. Srinagarin Dam 720

7. Vajiralongkorn Dam 300

8. Thathungna Dam 39

9. Kaeng Krachan Dam 19

10. Bang Lang Dam 84

11. Rajjaprabha Dam Unit 240

12. Pak Mun Dam 136

13. Small Hydro Power Plant (<10 MW) 17.78

Total 2,936.18

Projects Capacity (MW) COD

1. Khlong Tron Dam 2.5 2020

2. Pha Chuk Dam 14 2021

3. Ban Chan De 18 2023

Total 34.5

Trend

Ref: EGAT Power System Control and Operation Division

Status

Larg

e H

ydro

Key

Minimize the CAPEX costs and control environmental consciousness.

Under Operation

Large and small hydro power plant is built in multipurpose dam in order to store water, control flooding, and generate electricity. The large and small hydro power plant play an important role in Thailand serving the water to many large urban areas and a vast agricultural industry.

Hydro Power Plant Project: Downstream Irrigation Dams

Projects Capacity (MW)

1. Chao Pharaya Dam 12

2. Naresuan Dam 8

3. Mae Klong Dam 12

4. Khun Dan Prakan Chon Dam 10

5. Pasak Jolasid Dam 6.7

6. Kwai Noi Bumrung Dan Dam 30

7. Kiew Kho Ma Dam 5.5

8. Chulabhorn Dam (EGAT’s dam) 1.25

Total 85.45

The project were originated by the cooperation of Ministry of Agriculture andCooperatives and Ministry of Energy and are developed by EGAT. There are a lot ofexisting irrigation dams designed and constructed for irrigation, flood control, etc.The downstream will be developed through redevelopment of Existing IrrigationDams to maximized utilization of water resources.

Projects Capacity (MW) COD

1. Khlong Tron Dam 2.5 2020

2. Pha Chuk Dam 14 2021

Total 16.5

Under Construction

* It is under reviewing granted approval by National Energy Policy Council (NEPC)

Trend

Key

Completive Cost compared with Solar or Wind Energy (less than or equal to other RE)

Selected New Hydro Technology such as variable speed turbine or compact hydro to reduce the construction cost/time and O&M lead time.

Ref: EGAT Annual Report 2019

Status

24 Projects of total 69 MW*Under Operation

Hydro Power Plant Project: Renovation

Projects Capacity (MW) COD

1. Srinagarind Dam Unit 4-5 360 2025

2. Rajaprabha Unit 1-3 240 2027

Total 600

Projects Capacity (MW) COD

1. Bhumibol Dam Unit 7 115 2020

2. Srinagarind Dam Unit 1-3 300 2020

Total 415

Under Feasibility Study

Many of hydro power plants are aging due to a longtime operation (more than 30 years). The renovation is effective method to increase availability and efficiency.

Trend

Key

Design fit to the existing location and well prepare the sequence of dismantle and installation

Least shut-down time

In 2019-2037 EGAT’s Hydro Power Plant Renovation Plan

over 2,000 MW

Ref: EGAT Deputy Governor Generation Hydro Power Renovation Plan

Status

Projects Capacity (MW)

1. Bhumibol Dam Unit 1-2 164.4

2. Bhumibol Dam Unit 3-4 164.4

3. Bhumibol Dam Unit 5-6 164.4

4. Sirikit Dam Unit 1-3 375

5. Renovation Project for 5 Hydro Power Plants (Kaeng Krachan Dam,

Ubol Ratana Dam, Sirindhorn Dam, Chulaphorn Dam, Nam Pung Dam)

125

Total 993.2

MW

2019 2037

Under Renovation

Under Operation

Hydro Power Plant Project Pumped-Storage

The pumped-storage is designed to provide electricity generation at peak-load time. Water cycles is controlled by pump in a closed loop between the upper and lower reservoirs, usingsurplus energy at times of low demand.

During periods of high electrical demand, the stored water is released through turbines to produce electric power. The pumped-storage hydro power plant helps increase flexible dispatch, support Grid Modernization to maintain Energy security of the country.

Projects Capacity (MW) COD

1. Chulabhorn Pumped-Storage Hydro Power Plant (3 Units)

800 2031

2. Srinagarind Pumped-Storage Hydro Power Plant (3 Units)

800 2033

Total 1,600

As renewables energy such as solar and wind occupy a larger portion, the future pumped-storage project will enhance grid stability and support Grid Modernization.

Grid Modernization is EGAT’s policy by adapting the new technologies for increase of the intelligence or smarts of the grid. The grid modernization which is comprised of flexible plant, energy storage, digital substation, RE forecast center, national energy trading platform, demand response control center, and grid connectivity.

Projects Capacity (MW)

1. Srinagarin Dam Unit 4-5 360

2. Bhumibol Dam Unit 8 171

3. Lamtakong Jolabha Vadhana Unit 1-4 1,000

Total 1,531

Trend

Key

Site selection required both geographical height and water availability.

Support from the policy maker and permission authority for project approval.Ref: EGAT Annual Report 2019

Status

Under Feasibility Study

Under Operation

Hydro-Floating Solar Hybrid Project

The concept is to develop hybrid system with a combination of hydro power and floating solar in order to in crease flexibility and stability of electricity generation.

The hybrid plants are controlled by EMS to generate electricity from solar power in day time and from hydro power during peak hours at night.

1st Hydro-Floating Solar Hybrid Pilot Projectat Sirindhorn Dam

Capacity : 58.5 MWdc (45 MWac) Location : Sirindhorn Dam , Ubon Ratchathani Energy: 87,892,000 Unit / year Investment Cost : 842 MB (14.39 MB/1 MW) COD (Commercial Operation Date): 2020

Key

Cost: More Competitive Cost Technology: Security of Renewable Energy and

Control with one platform. Social & Environment: Less Impact

Hybrid Projects

9 Dams

16 ProjectsIn EGAT’s Multipurpose Dams

North1,278 MW

Northeast109 MW

West1,020 MW

South318 MW

2,725 MWDuring 2018-2037 (PDP 2018)

Trend Status

Summary Hydro Power Plant

Decrease the development of Large hydro power projects in Thailand due to high

CAPEX cost and increased environmental consciousness.

Increase more small hydro power projects downstream of irrigation dams for the

maximum utilization of water resources.

Integrate existing hydro power plants with other renewable energy and renovate the

aging plants with more than 30 years lifetime.

Promote pumped-storage hydro plants with high opportunity to support grid

modernization.

1

2

3

4

“Innovate Power Solutions for a Better Life”