September 23, from Southeastern Tibet to the Guangdong-Hong Kong-Macao Greater Bay Area, ±800kV Ultra-High Voltage Direct current Power Transmission Project (Environmental Impact Assessment Public Notice for the "Tibet-Guangdong DC Transmission Project," hereinafter referred to as "Tibet-Guangdong DC Project")

Necessity of Construction:

To drive the green energy transition and achieve the "dual carbon" goals, it is essential to establish a robust power transmission channel from Tibet, enabling the efficient development and optimized allocation of the region’s abundant resources in southeastern Tibet. This initiative will not only support Tibet’s economic and social growth as well as border stability but also enhance Guangdong’s ability to ensure a reliable electricity supply and help refine the country’s energy supply structure. Furthermore, it will foster innovation in power technology and lay the foundation for sustainable energy development. The construction of the ±800kV ultra-high-voltage direct current (UHV DC) transmission project connecting southeastern Tibet to the Guangdong-Hong Kong-Macao Greater Bay Area—hereafter referred to as "this project"—is deemed necessary for these reasons. The project has already been included in China’s National "14th Five-Year Plan" for Power Development (Document No. 1869 of the NDRC Energy [2021]) and featured in the National Energy Administration’s Minutes from the Special Meeting on Accelerating the Construction of Inter-Provincial Transmission Projects during the 14th Five-Year Plan period. Additionally, in June 2025, the project received approval from the National Development and Reform Commission through Document No. 791 of 2025, authorizing the T067 project—the ±800kV UHV DC transmission line linking southeastern Tibet to the Guangdong-Hong Kong-Macao Greater Bay Area.

Project Overview:

The construction of this project includes:

Newly Built Changdu ±800kV Converter Station at the Sending End (Including grounding electrodes, grounding electrode lines, and off-site power supplies), Newly Built Zayu ±800kV Converter Station at the Sending End (Including grounding electrodes, grounding electrode lines, and off-site power supplies), Newly Built Shouduan Xiaojing ±800kV Converter Station (Including grounding electrodes, grounding electrode lines, and off-site power supplies), Newly Built ±800kV Converter Station in Central Receiving Area (Including grounding electrodes, grounding electrode lines, and off-site power supplies), Newly Built ±800kV DC Transmission Line Project 、 New Linzhi Inspection Station Project 。

The construction site of this project spans across 4 provinces (autonomous regions)—Tibet Autonomous Region (Zogong County, Chaya County, Basu County in Changdu City; and Chayu County in Nyingchi City)—as well as Yunnan Province (Gongshan Dulong and Nu Autonomous County and Lanping Bai and Pumi Autonomous County in Nujiang Lisu Autonomous Prefecture; Weixi Lisu Autonomous County in Diqing Tibetan Autonomous Prefecture; Yongsheng County in Lijiang City; and Jianchuan, Eryuan, Heqing, and Binchuan counties in Dali Bai Autonomous Prefecture; Dayao, Muding, Lufeng City, and Shuangbai County in Chuxiong Yi Autonomous Prefecture; Yimen County and Eshan Yi Autonomous County in Yuxi City; Shípíng, Jiànshuǐ, Mílè, and Kāiyuǎn cities in Honghe Hani and Yi Autonomous Prefecture; and Yànsān, Qiūběi, Guǎngnán, and Fùníng counties in Wenshan Zhuang and Miao Autonomous Prefecture)—and Guangxi Zhuang Autonomous Region (Tiánlín, Youjiang District, and Língyún County in Baise City; Bama Yao Autonomous County and Dahua Yao Autonomous County in Hechi City; Mǎshān and Shànglín Counties in Nanning City; Héshān City, Xīngbīn District, Sanjiangkou New Area, Xiàngzhōu County, Wǔxuān County, and Jinxiu Yao Autonomous County in Laibin City; Pingnan County in Guigang City; Zhaoping County in Hezhou City; and Téngxiàn, Cāngwú County, and other areas in Wúzhōu City)—and Guangdong Province (Fēngkāi, Huáijí, Guǎngníng County, and Sìhuì City in Zhaoqing; Sanshui District in Foshan; Huādū and Cónghuà Districts in Guangzhou; Qingcheng District, Fogang County, Qingxin District, and Yingde City in Qingyuan; Xīnfēng County in Shaoguan; Longmen, Boluo, Huicheng District, Zhongkai High-tech Zone, Huiyang District, and Huidong County in Huizhou; Dongguan City; and Longgang and Longhua Districts in Shenzhen). The project covers a total of 26 cities (prefectures) and 64 counties (cities, districts) across these regions.

The total investment for this project is 52.161 billion yuan, of which 513.7039 million yuan is allocated to environmental protection measures. Environmental protection investments account for 0.98% of the project's total investment.

The project is scheduled to be completed and operational by 2029.

Converter Station Project

Newly constructed Changdu ±800kV converter station (including grounding electrode, grounding electrode line, and off-site power supply)

(1) The geographical location of the Changdu ±800kV Converter Station (hereinafter referred to as "Changdu Converter Station") is approximately 18 km north of Meiyu Township, Zogong County, Changdu City, Tibet Autonomous Region, near Bianyu Village. It is situated right next to a rural road on its eastern side, about 85 km south of Zogong County, roughly 36 km northwest of Changdu Bangda Airport, and within approximately 25 km of National Highways G318/G214 to the south. Transportation access in the area is excellent.

(2) Construction Content and Scale

1) The DC-side sending-end Changdu Converter Station adopts a multi-terminal flexible DC parallel configuration, featuring one ±800kV DC bipolar outgoing line with a rated power of 8,000 MW and a rated current of 5,000 A. The converter transformers consist of 20 single-phase, dual-winding units—12 high-end converters, 6 low-end converters, and 2 as spares—each with a capacity of approximately 375 MVA for the high-end units and 750 MVA for the low-end units. Each pole is equipped with six current-limiting reactors, each with an inductance of 25 mH, while a total of 24 bridge-arm reactors, also with an inductance of 25 mH each, are installed. Additionally, there is one grounding electrode outgoing line leading to the Long'a Grounding Pole.

2) In the 500kV section of the AC system, the long-term plan calls for the construction of four 1000 MVA main transformers, seven 500kV outgoing lines, and 12 220kV outgoing lines. Each main transformer will be equipped with two 60 Mvar low-voltage capacitor banks, one low-voltage reactor, and one 60 Mvar dynamic reactive power compensation unit (SVG). For the current phase, two 1000 MVA main transformers will be built, along with six 500kV outgoing lines this phase (including two to Guoqing II, two to Guoqing I, and two to Zogong). There will be no 220kV outgoing lines constructed in this phase. Of the two 500kV lines leading to Guoqing I, one line is preliminarily designed to accommodate a 90 Mvar high-reactance reactor and a neutral-point small reactor in the future—no additional equipment will be added beyond this. Each main transformer will also feature two 60 Mvar low-voltage capacitor banks and one 60 Mvar dynamic reactive power compensation unit. Additionally, there will be three 35kV station-service transformers, each with a capacity of 31.5 MVA.

(3) Grounding Electrode System

1) The grounding electrode terminal, located at the Long'a Grounding Pole Site in Guoqing Township, Basu County, Changdu City, Tibet Autonomous Region, is approximately 61 km away in a straight line from the Changdu Converter Station site. The grounding ring adopts a shallow, horizontally buried design with a three-ring circular layout. The inner and outer ring radii are 400 m and 480 m, respectively, while the outermost ring has a radius of 550 m. The total length of the grounding ring is 8,985 meters, and all rings are buried at a depth of 4.5 meters.

2) The grounding electrode line originates at the Changdu Converter Station and terminates at the Long'a Grounding Electrode. It operates at a maximum voltage level of 35 kV, with a newly constructed route spanning approximately 96.0 km. The line is designed as a single-circuit overhead configuration. Along its path, the grounding electrode line passes through Zogong County, Chaya County, and Basu County in Changdu City, Tibet Autonomous Region.

(4) The off-site power converter station is supplied by three independent power sources: two serving as primary power supplies (both at 35kV), and one acting as a backup power source (also at 35kV). The two primary power sources are connected to the low-voltage side of the converter station’s 500kV main transformer, while the single backup power source is drawn from the low-voltage side of the 500kV Zuogong Station’s main transformer. The total length of the off-site transmission lines is approximately 14.3 km, constructed as a single-circuit overhead line. Additionally, the 500kV Zuogong Station’s current expansion project includes adding one new 35kV outgoing circuit breaker bay. According to the "Catalogue for Categorized Management of Environmental Impact Assessments for Construction Projects" (2021 edition), this specific expansion—being a 35kV-level project—is classified under Category 5, which states, "Construction projects not explicitly listed in this catalogue are excluded from environmental impact assessment management." The grounding electrode’s external power supply operates at 10kV, connected via a T-junction directly to the existing 10kV Mudo Line. This connection spans about 1.1 km and is also implemented as a single-circuit overhead line, located in Basu County, Changdu City, Tibet Autonomous Region.

Construction of the newly built Chayu ±800kV Converter Station (including grounding electrode, grounding electrode line, and off-site power supply)

(1) The geographical location of the Zayu ±800kV Converter Station (hereinafter referred to as "Zayu Converter Station") is on the southern side of Chawalong Township, Zayu County, Nyingchi City, Tibet Autonomous Region. It is approximately 100 km west of Zayu County and about 52 km southeast of Bingzhongluo Town.

(2) Construction Content and Scale

1) The sending-end Chayu Converter Station in the DC section adopts a multi-terminal flexible DC parallel configuration, featuring two ±800kV DC bipolar outgoing lines—each connecting to the sending-end Changdu ±800kV Converter Station and the receiving-end Xiaojing ±800kV Converter Station. The station is rated for an output power of 5,000 MW with a rated current of 3,125 A. The converter transformers consist of 14 single-phase, dual-winding units (with 2 as spares), each rated at 466.67 MVA. Each pole is equipped with two sets of current-limiting reactors, each set having an inductance of 75 mH. Additionally, a total of 24 bridge-arm reactors are installed, with each reactor rated at 40 mH. Finally, there is one grounding electrode outgoing line, leading to the Nanquwa Grounding Electrode.

2) For the 500kV section of the interconnection, the long-term plan calls for the construction of two 750 MVA main transformers, along with one of the two lines leading to Leftong II (Chayu side), which will be equipped with a single 180 Mvar high-voltage shunt reactor and a neutral-point small reactor. Additionally, the other line heading to Chayu Substation (also on the Chayu side) will feature a 120 Mvar high-voltage shunt reactor paired with a neutral-point small reactor. The project will include 10 outgoing 500kV lines and 6 outgoing 220kV lines, with each main transformer fitted with three 60 Mvar low-voltage reactors. In the current phase, two 750 MVA main transformers will be constructed, along with six 500kV outgoing lines (including two to Chayu, two to Leftong II, one to Zala Power Station, and one to Molong Power Station). There will be no new 220kV outgoing lines built in this phase. Furthermore, the existing line leading to Leftong II (on the Chayu side) will be upgraded with a 180 Mvar high-voltage shunt reactor and a neutral-point small reactor, while the line to Chayu Substation (also on the Chayu side) will be equipped with a 120 Mvar high-voltage shunt reactor and a neutral-point small reactor. Each main transformer will also be fitted with two 60 Mvar low-voltage reactors. Finally, the substation will include one 110kV station-service transformer rated at 25 MVA, as well as two 35kV station-service transformers, each with a capacity of 25 MVA.

(3) Grounding Electrode System

1) The grounding electrode at the Send-end Chayu Converter Station—specifically, the Nanquawa electrode site—is located southwest of Muruo Village in Chayu County, Nyingchi City, Tibet Autonomous Region. The site is approximately 2.5 km from Muruo Village and about 47.5 km away from the Chawalong site of the Chayu Converter Station. To the east of the site, the local village road, Dulongjiang Road, runs directly adjacent, while the G219 National Highway lies roughly 2 km to the northwest. The grounding electrode system follows the natural terrain, employing an irregular vertical design. The electrode structure itself consists of vertically installed grounding rods arranged along an irregular single-loop configuration, with the loop perimeter spanning 2,800 meters. A total of 53 grounding wells have been dug, each ranging in depth from 5 to 45 meters.

2) The grounding electrode line originates at the Chayu Converter Station and terminates at the Nanquwa Grounding Electrode. It operates at a maximum voltage level of 35 kV, with a newly constructed line route spanning approximately 61.8 km. The line is installed as a single-circuit overhead system, and the entire length of the grounding electrode line lies within Chayu County, Nyingchi City, Tibet Autonomous Region.

(4) The off-site power converter station is supplied by three independent power sources: two serving as primary power supplies (both at 35 kV), and one acting as a backup source (110 kV). The two primary power sources are connected to the 35 kV side of the converter station’s 500 kV main transformer, while the single backup power source is drawn from the 110 kV Bitu Substation in Zogong County. The total length of the external power lines is approximately 43.0 km, all constructed as single-circuit overhead lines. Additionally, the 110 kV Bitu Substation will undergo an expansion phase this year, adding one new 110 kV outgoing line bay. The grounding electrode’s external power supply operates at 35 kV, tapped directly from the 35 kV Ridong Line near the grounding electrode. This connection spans about 200 meters and is implemented using underground cable installation, located within the boundaries of Chayu County, Nyingchi City, Tibet Autonomous Region.

Construction of the new Shouduan Xiaojing ±800kV Converter Station (including grounding electrode, grounding electrode line, and off-site power supply)

(1) Geographically, the Dongxiaojing ±800kV Converter Station (hereinafter referred to as “Xiaojing Converter Station”) is located approximately 6.0 km southwest of Chini Town in Huadu District, Guangzhou City, Guangdong Province. It lies 200 meters west of Xiaojing Village and just 235 meters south of the boundary between Huadu District and Sanshui District in Foshan City. Additionally, the station is about 100 meters west of the under-construction Foqing Conghua Expressway.

(2) Construction Content and Scale

1) The receiving-end Xiaojing Converter Station for the DC section adopts a multi-terminal flexible HVDC parallel configuration. It features two ±800kV DC bipolar outgoing lines—each connecting to the sending-end Chayu ±800kV Converter Station and the receiving-end Central China ±800kV Converter Station—delivering a rated power of 5,000 MW with a rated current of 3,125 A. The converter station is equipped with 14 single-phase, double-winding transformers (including 2 spares), each with a capacity of 450 MVA. Additionally, each pole is fitted with two sets of current-limiting reactors, each set having an inductance of 75 mH. A total of 24 bridge-arm reactors are installed, with each reactor rated at 40 mH. Finally, there is one grounding electrode outgoing line, leading to the Weizaixia grounding electrode.

2) In the 500kV AC section, the long-term plan calls for the construction of 4 × 1000 MVA main transformers, 6 × 500kV outgoing lines, and 16 × 220kV outgoing lines. Each main transformer will be equipped with 3 sets of 60 Mvar low-voltage capacitors and 2 sets of 60 Mvar low-voltage reactors. For the current phase, 2 × 1000 MVA main transformers will be built, along with 4 × 500kV outgoing lines (including 2 lines to Luodong and 2 to Beijiao). Each main transformer will feature 3 sets of 60 Mvar low-voltage capacitors and 1 set of 60 Mvar low-voltage reactors. Additionally, the substation will include one 110kV external power supply transformer with a capacity of 20 MVA, as well as two 35kV station-service transformers, each rated at 20 MVA.

(3) Grounding Electrode System

1) The grounding electrode site for the Xiaojing Converter Station is located approximately 5.8 km north of Dawan Town, Yingde City, Qingyuan Municipality, Guangdong Province, and about 115 km in a straight line from the station site of the Xiaojing Converter Station. For this project, a deep-well arrangement has been adopted for the grounding electrodes, with four deep wells planned for installation. The minimum spacing between the deep-well electrodes will be 100 meters, each buried at a depth of 100 meters, while the wells themselves will reach a total depth of 1,000 meters.

2) The grounding electrode line originates at the Xiaojing Converter Station and terminates at the Weizai Xia Grounding Electrode. Its maximum operating voltage level is 35 kV, with a newly constructed line route spanning approximately 181 km. The line is divided into sections, some of which are built using shared towers with the DC transmission lines, while others are installed as single-circuit overhead lines—specifically, the section sharing towers with the DC lines measures 93 km in length. The grounding electrode line passes through Huadu District and Conghua District in Guangzhou City, as well as Qingcheng District, Fogang County, Qingxin District, and Yingde City in Qingyuan City.

(4) The off-site power converter station is supplied by three independent power sources: two serving as working supplies (voltage level of 35 kV), and one acting as a backup supply (voltage level of 110 kV). The two working power sources are connected to the low-voltage side of the converter station’s 500 kV main transformer. The single backup power source is drawn from the 110 kV Lantian Substation, with an off-site power line approximately 5.9 km long. This line is constructed using a combination of a single-circuit overhead section (5.7 km) and a cable-laid section (0.2 km). Additionally, the 110 kV Lantian Substation is currently expanding by adding one new 110 kV outgoing circuit breaker bay. The grounding electrode’s external power supply operates at 10 kV, connected via a T-junction directly to the 10 kV Changshan Trunk Line, specifically the Yaobu Branch Line, with a total line length of about 100 meters. This section is entirely laid underground using cables and is located in Yingde City, Qingyuan Prefecture, Guangdong Province.

Construction of the new ±800kV converter station in the central receiving area (including grounding electrode, grounding electrode line, and off-site power supply)

(1) Geographically, the ±800kV Converter Station in Central China (hereinafter referred to as the "Central Converter Station") is located at the junction of Longhua District and Longgang District in Shenzhen, Guangdong Province, situated on a plot where Shanlan Avenue meets Shanli Avenue. To the north of the site, it is approximately 200 meters away from the Shenhai Expressway G15; to the west, about 150 meters from Shanlan Avenue; to the south, roughly 360 meters from the Leigongding Tunnel along Shanli Avenue; and to the east, around 400 meters from the Qingping Expressway. Additionally, the northwest side of the site is about 2.6 km from Guanlan Subdistrict, the northeast side is approximately 3.5 km from Pinghu Subdistrict, the southwest side lies roughly 4.8 km from Longhua Subdistrict, and the southeast side is about 3.3 km from Nanwan Subdistrict.

(2) Construction Content and Scale

1) The receiving-end converter station in the DC section adopts a multi-terminal flexible DC parallel configuration, featuring one ±800kV DC bipolar outgoing line with a rated power of 5000 MW and a rated current of 3125 A. The converter transformers consist of 14 single-phase, dual-winding units (with 2 as spares), each rated at 450 MVA. Each pole is equipped with two sets of current-limiting reactors, each set having an inductance of 75 mH. Additionally, a total of 24 bridge-arm reactors are installed, with each reactor rated at 40 mH. Finally, there is one grounding electrode outgoing line leading to the Dabucun grounding station.

2) In the 500kV section of the AC system, the long-term plan calls for the construction of 4 × 1000 MVA main transformers, along with 8 outgoing 500kV lines and 18 outgoing 220kV lines. Each main transformer will be equipped with 3 sets of 60 Mvar low-voltage capacitors and 2 sets of 60 Mvar low-voltage reactors. For the current phase, 2 × 1000 MVA main transformers will be built, along with 6 outgoing 500kV lines in this phase (including 2 lines each to Pengcheng, Shenzhen, and Modern). Additionally, each main transformer will feature 3 sets of 60 Mvar low-voltage capacitors and 1 set of 60 Mvar low-voltage reactors. The substation will also include one 110kV external power supply transformer with a capacity of 20 MVA, as well as two 35kV station-service transformers, each rated at 20 MVA.

(3) Grounding Electrode System

1) The grounding electrode site for the receiving-end converter station, located in Dabu Village, Andun Town, Huidong County, Huizhou City, Guangdong Province, is approximately 3.4 km from the center of Andun Town and about 113 km in a straight line from the main converter station site. For this project, a deep-well arrangement has been adopted for the grounding electrodes, with four deep wells planned for this phase. The minimum spacing between the deep-well electrodes is 100 meters, each well will be buried at a depth of 100 meters, and the total depth of each well will reach 1,000 meters.

2) The grounding electrode line originates at the Central Converter Station and terminates at the Dabu Village grounding electrode. It operates at a maximum voltage level of 35 kV, with a newly constructed route spanning approximately 219.8 km. The line is designed in segments, either sharing towers with the DC transmission lines or being erected as single-circuit overhead structures. Notably, the section sharing towers with the DC lines extends over 132.8 km. The grounding electrode line traverses Longhua District and Longgang District in Shenzhen City, as well as Fenggang Town and Qingxi Town in Dongguan City, and further passes through Huayang District, Huicheng District, Zhongkai New Area, Boluo County, Huidong County in Huizhou City, and Zijin County in Heyuan City.

(4) The off-site power converter station is supplied by three independent power sources: two serving as primary power supplies (voltage level of 35 kV), and one acting as a backup supply (voltage level of 110 kV). The two primary power sources are connected to the low-voltage side of the converter station’s 500 kV main transformer, while the single backup power source is drawn from the 110 kV Bandian Substation. The 110 kV off-site power line spans approximately 3.6 km and is constructed using underground cable installation. Additionally, the current expansion at the 110 kV Bandian Substation includes the addition of one new 110 kV outgoing circuit bay. The grounding electrode’s external power supply operates at 10 kV, connected via a T-junction directly to the 10 kV Rehotang feeder line, which runs for about 200 meters entirely underground in An Dun Town, Huidong County, Huizhou City, Guangdong Province.

Line Engineering:

This ±800kV DC transmission line project originates at the Changdu Converter Station in Meiyu Township, Zogong County, Changdu City, Tibet Autonomous Region. It then passes through the Chayu Converter Station in Chayu County, Nyingchi City, and finally reaches the Zhongbu Converter Station, located at the junction of Longhua and Longgang Districts in Shenzhen, Guangdong Province. The project’s total DC transmission capacity is 10,000 MW, with the following specifications: - The section from Changdu Converter Station to Chayu Converter Station has a capacity of 8,000 MW and operates at a rated current of 5,000 A. - The segment from Chayu Converter Station to Xiaojing Converter Station boasts a capacity of 10,000 MW, with a rated current of 6,250 A. - The final section, from Xiaojing Converter Station to Zhongbu Converter Station, delivers 5,000 MW at a rated current of 3,125 A. The newly constructed transmission line spans approximately 2,681.3 km in total, with the entire route built as an overhead line system.

Among these, the Changdu Converter Station to Chayu Converter Station section spans 265.3 km, while the Chayu Converter Station to Xiaojing Converter Station segment covers 2,013.2 km, and the Xiaojing Converter Station to Zhongbu Converter Station section measures 402.8 km. The transmission lines traverse four provinces (autonomous regions)—Tibet, Yunnan, Guangxi, and Guangdong—passing through 25 cities (prefectures) and 58 counties (cities, districts). Specifically, the section within Tibet is approximately 306.3 km long, the portion in Yunnan stretches about 1,106 km, the segment in Guangxi covers roughly 678 km, and the section in Guangdong extends for about 591 km.

The Linzhi Inspection Station project involves the construction of a new inspection station located near Dengxu Village, Chawalong Township, Chayu County, Linzhi City, Tibet Autonomous Region. The station will include a two-story comprehensive building, a one-story guardhouse, a one-story garage, a one-story warehouse for spare parts and equipment, a one-story pump room and machine room, as well as various ancillary facilities.

Characteristics of construction projects

This project is an ultra-high-voltage direct current (UHV DC) transmission project with a required transmission capacity of 10 million kilowatts. On the sending-end side, the southeastern Tibetan region boasts vast expanses of land. The hydropower plants supporting the DC project, along with complementary new energy sources, are primarily concentrated in the Baxiu area of Changdu and the Chayu area of Nyingchi, respectively—locations that are quite distant from each other. Therefore, the sending end is designed to accommodate two converter stations, strategically situated near the respective hydropower and photovoltaic clusters. Based on resource distribution and favorable engineering-geological conditions, the hydropower-oriented converter station will be located near Chawalong Township in Chayu County, Nyingchi City, while the photovoltaic-focused station will be sited close to Mayu Township in Zogong County. According to the site-selection studies, the project has finalized two key locations: the northern Mayu site and the southern Chawalong site. The final sending-end system configuration integrates several critical factors, including the layout of the converter stations, their respective capacities, the methods for gathering and integrating new energy resources, and the approaches for connecting hydropower generation. Additionally, considering the ongoing advancements in IGBT device development essential for flexible DC transmission, the project proposes a comprehensive sending-end integration plan: one converter station will be dedicated to new energy sources, while another will serve the hydropower sector. Notably, the southern hydropower station is expected to leverage the planned Dian-Tibet Railway power supply project, enabling coordinated integration of the converter station, optimized hydropower transmission, and strategic energy storage. Meanwhile, the northern new-energy converter station will be designed to support both grid-connected and isolated-operation modes.

On the receiving end, in light of the power shortfall at the receiving end, site-selection work for converter stations has been carried out in the core Pearl River Delta region—the Guangdong load center. As a result, the Xiaojing site in Guangzhou and the central site in Shenzhen have been chosen. The Pearl River Delta boasts a high urbanization rate, leading to tight land availability for station sites. While these selected sites can accommodate a 5-million-kilowatt converter station, expanding to an 8-million-kilowatt or larger facility would prove challenging due to constraints imposed by local construction conditions and government land-use planning.

Considering the site-selection criteria for the receiving-end converter stations, and taking into account that adopting a dual-point landing scheme could accommodate 10 million kilowatts of DC power while limiting single-point reception to 5 million kilowatts—matching the current scale of Guangdong's operational receiving channels—the existing 500kV main grid infrastructure across the receiving regions would still ensure safe and stable operation even in the event of a DC fault. Therefore, two converter stations will be constructed at the receiving end.