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India’s Top Five STUs’ Existing Transmission Network [free access]

January 10, 2020

As of March 2018, India’s total transmission line length network stood at around 570,902 circuit km, with 1,142,731 MVA of transformer capacity. The country’s network is owned and operated by around 40 companies, of which three are central transmission utilities (CTUs), 24 are state-owned transmission companies (STUs) and 13 are private companies. While CTUs and private players operate the interstate transmission networks, STUs are responsible for the development and operation of the high voltage network in their respective states.

 

The top five STUs (based on their ownership share of the total transmission line length network in India) own and operate about 37.5 per centof India’s high voltage network. These five utilities are Gujarat Electricity Transmission Company Limited (GETCO), Maharashtra State Electricity Transmission Company Limited (MSETCL), Rajasthan Rajya Vidyut Prasaran Nigam Limited (RVPNL), Karnataka Power Transmission Corporation Limited (KPTCL) and Madhya Pradesh Power Transmission Company Limited (MPPTCL).

 

As of the end of March 2018, the total transmission network owned and operated by these five STUs stood at about 214,276 circuit km, increasing from 179,374 circuit km in 2013, witnessing a compound annual growth rate (CAGR) of 3.6 per cent.

 

GETCO, with 61,056 circuit km of lines, has the largest transmission network, accounting for 28.5 per cent of the total transmission network of these five STUs, followed by MSETCL and RVPNL at 21.6 and 17.5 per cent respectively, KPTCL at 16.8 per cent and MPPTCL at 15.5 per cent.

 

Table 1: Growth in transmission line length during 2013-18 (circuit km)

 Utility

2013

2014

2015

2016

2017

2018

GETCO

47,972

50,131

52,542

55,468

58,507

61,056

MSETCL

42,109

42,578

44,207

44,030

44,618

46,218

RVPNL

29,605

30,667

32,513

33,960

35,441

37,607

KPTCL

31,864

32,469

33,294

33,912

35,119

36,124

MPPTCL

27,824

29,010

30,194

31,364

32,369

33,270

Total

179,374

184,855

192,750

198,734

206,054

214,276

Note: Data is as of March for the mentioned year.

Source: Gujarat Electricity Transmission Company Limited; Maharashtra State Electricity Transmission Company Limited; Rajasthan Rajya Vidyut Prasaran Nigam Limited; Karnataka Power Transmission Corporation Limited; Madhya Pradesh Power Transmission Company Limited; Global Transmission Research

 

Transformer capacity of the five STUs increased at a CAGR of 7.2 per cent during 2013-18, bringing the total transformer capacity to 419,992 MVA in 2018 from 296,687 MVA in 2013, with MSETCL contributing 29.5 per cent to the capacity, followed by GETCO and RVPNL at 25.1 and 18.7 per cent respectively, and KPTCL and MPPTCL at 13.3 per cent each. 

 

Table 2: Growth in transformer capacity during 2013-18 (MVA)

 Utility

2013

2014

2015

2016

2017

2018

GETCO¹

62,069

68,875

80,113

91,544

101,259

105,626

MSETCL

100,167

103,603

105,434

110,814

119,096

123,838

RVPNL

48,245

53,249

63,319

68,036

72,552

78,610

KPTCL²

48,456

49,846

52,082

53,269

54,151

56,038

MPPTCL

37,750

41,163

45,457

49,409

53,114

55,880

Total

296,687

316,736

346,405

373,072

400,172

419,992

Notes: Data is as of March for the mentioned year; 1­– GETCO’s transformer capacities for 2016 and 2017 have been estimated based on past additions, and capacity for 2018 has been estimated based on CAGR between 2017 and 2014; 2 – KPTCL’s transformer capacity for 2016 has been estimated based on CAGR between 2011 and 2015,and figures for 2017 and 2018 have been estimated based on past additions.

Source: Gujarat Electricity Transmission Company Limited; Maharashtra State Electricity Transmission Company Limited; Rajasthan Rajya Vidyut Prasaran Nigam Limited; Karnataka Power Transmission Corporation Limited; Madhya Pradesh Power Transmission Company Limited; Global Transmission Research

 

As of March 2018, the majority (35 per cent) of the transmission network of these STUs was at the 220 kV voltage level, followed by the 132 kV voltage level (26 per cent), whose share in the total network has remained the same since 2013.

 

Though the share of 400 kV transmission lines owned by the five STUs increased only from 11 per cent to 12 per cent during 2013-18, this voltage segment witnessed a CAGR of 5.9 per cent during 2013-18, which was the highest across all voltages. It was also during 2013-18 that RVPNL introduced 765 kV extra high-voltage (EHV) line in its transmission line length network. Further, only MSETCL has a transmission network at the 500 kV high voltage direct current (HVDC) voltage level.

 

Figure 1: Transmission line length in 2013 and 2018, by voltage (%) 

 

Source: Global Transmission Research

 

For the five STUs, 37 per cent of transformer capacity was at the 220 kV voltage level in 2018, whose share in the total network has decreased by 3 per cent since 2013. Meanwhile, the share of transformer capacity at 132 kV and 110 kV decreased by 2 per cent and 1 per cent respectively during 2013-18.

 

The transformer capacity at 400 kV increased at a CAGR of over 9.1 per cent. Also, both RVPNL and MSETCL introduced transformer capacity at the 765 kV voltage level during 2013-18.

 

Figure 2: Transformer capacity in 2013 and 2018, by voltage (%) 

 

 

Source: Global Transmission Research