As the renewable energy cannot generate electricity constantly to fulfill continued demand of power; “energy storage system” turns to be “important key” which could fill the gap.

         “Battery”, Significant Auxiliary for Renewable Energy Usage

         In accordance with Thailand’s power development direction, a policy promoting an increase of the renewable energy usage was imposed. Since a production cost has been decreasing, the renewable energy usages as household electricity and power production for supplying to the electricity system are higher. However, as the renewable energy cannot generate electricity constantly to fulfill continued demand of power; “energy storage system” turns to be “important key” which could fill the gap.

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         What Can the Battery Do?

         From past to present, Electricity Generating Authority of Thailand (EGAT) has been using pumped storage hydropower plants as sources for energy storages. These plants with a total capacity of 1,031 megawatts are located at dams throughout the country. Their capacity will be increased for another 2,100 megawatts. However, since the hydropower plant has to be constructed at an appropriate area with high investment, it becomes restriction. At present, a larger quantity of electricity is generated from the renewable energy; “Battery Energy Storage” becomes the significant auxiliary which is consistent with the current situation. Battery consumes less space and can be installed at areas of supply, production and transmission to meet a wide range of applications including:

         1. Smoothing; reduce fluctuation of the renewable energy and stably distribute the power.

         2. Energy Shifting; be a power storage during off-peak and distribute power during peak.

         3. Frequency Regulation; control and maintain the utility frequency.

         4. Congestion Management; facilitate the transmission system to be able to use the power generated from the renewable energy efficiently.

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         EGAT’s Battery Project

         EGAT has studied and initiated the battery energy storage in order to promote the renewable energy usage as well as stabilizing the electricity system, especially at the areas of power generation and transmission. There are 3 battery energy storage installations including the project at Mueang District, Mae Hong Son Province. Its installed capacity will be 4 megawatts which can distribute power to the system for being used in the province for 15 minutes.

         This project is operated at the same area of the solar power project. Its capacity will be added for 3 megawatts (3.5 megawatts including production capacity from solar cells). Mae Hong Son Province was chosen to be a location of the project because there is none of transmission line in the area, which causes brownout and power failure quite often. In addition, the battery energy storage will work in conjunction with the smart grid. EGAT shall use information technology to manage and ensure continued and stabilized power distribution for the area. It is forecasted that when the project completes in March 2019, the power failure period will be less than 500 minutes per year from its maximum at 2,614 minutes per year.

         Another 2 projects are Bamnet Narong 16-megawatt substation at Chaiyaphum Province and Chai Badan 21-megawatt substation at Lopburi Province. The projects will be completed around May 2019. Both project’s energy storage systems comprise lithium-ion batteries. The features of this kind of battery include rapid responseexecuting within milliseconds, high efficiency, long cycle life and space-saving installation.

         The battery energy storage will be installed in the substations located in the southeastern Thailand only. This region is chosen because there is a large amount of electricity, which will be increased continually, generated from the renewable energy. It is forecasted that in 2020, Chaiyaphum Province’s production capacity derived from the renewable energy will become 218.2 megawatts, while Lopburi Province’s capacity will also increase to be 301.2 megawatts. The installed battery energy storages will take 2 functions including renewable firming and energy shifting.

         Since the advance technology has caused battery’s higher efficiency and lower price, installing backup battery in the electricity system is a great opportunity to promote the renewable energy usage, strengthen the country’s power security and ensure appropriate price of electricity.

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