LIST OF 230 KV SUB-STATIONS
| S.NO | NAME OF THE SUB-STATION | VOLTAGE RATIO IN KV | COMMISSIONING DATE |
| 1 | ERODE UG | 230/110/22 | 07-11-2022 |
| 2 | KORATTUR | 230/110/33-11 | 1949/1961 |
| 3 | THUDIYALUR | 230/110 | 29-08-1963 |
| 4 | PASUMALAI | 230/110 | 30-08-1963 |
| 5 | TRICHY (PIRATTUR) | 230/110 | 22-10-1963 |
| 6 | SINGARAPET | 230/110 | 14-02-1966 |
| 7 | VINNAMANGALAM | 230/110 | 04-05-1969 |
| 8 | THIRUVALAM | 230/110 | 04-05-1969 |
| 9 | SINGAPERUMALKOIL | 230/110 | 04-07-1977 |
| 10 | METTUR | 230/110/33 | 27-04-1979 |
| 11 | KARAIKUDI | 230/110 | 04-10-1980 |
| 12 | THIRUVARUR | 230/110/66-33-11 | 25-10-1980 |
| 13 | INGUR | 230/110 | 24-11-1980 |
| 14 | UDUMALPET | 230/110 | 25-01-1982 |
| 15 | VILLUPURAM | 230/110 | 15-04-1982 |
| 16 | ARANI | 230/110 | 16-03-1983 |
| 17 | KADAPPERI | 230/110/11 | 12-08-1985 |
| 18 | PERAMBALUR | 230/110 | 31-03-1986 |
| 19 | HOSUR | 230/110/33-11 | 29-03-1987 |
| 20 | TONDAIYARPET | 230/110/33 | 27-03-1988 |
| 21 | THENI | 230/110 | 27-03-1989 |
| 22 | ANUPPANKULAM | 230/110/11 | 09-09-1991 |
| 23 | KOYAMBEDU | 230/110/33 | 03-11-1991 |
| 24 | DEVIAKURCHY | 230/110 | 05-12-1991 |
| 25 | ARASUR | 230/110 | 11-11-1992 |
| 26 | GUMMIDIPOONDI | 230/110 | 06-10-1993 |
| 27 | ALUNDUR | 230/110 | 20-12-1993 |
| 28 | UNJANAI | 230/110 | 11-03-1994 |
| 29 | TARAMANI | 230/110/33 | 08-02-1995 |
| 30 | GOBI | 230/110 | 27-03-1995 |
| 31 | SEMBATTY | 230/110 | 22-09-1996 |
| 32 | PUGALUR | 230/110 | 07-02-1997 |
| 33 | EACHANGADU | 230/110 | 07-02-1997 |
| 34 | PARAMAKUDI (KAVANOOR) | 230/110 | 15-09-1997 |
| 35 | THIRUVANNAMALAI | 230/110 | 29-11-1997 |
| 36 | MYLAPORE I | 230/110/11 & 33/11 | 01-01-1998 |
| 37 | CUDDALORE | 230/110/22 | 28-02-1998 |
| 38 | SENBAGARAMANPUDUR (S.R.PUDUR) | 230/110 | 18-06-1998 |
| 39 | ALAGARKOVIL | 230/110 | 31-05-1999 |
| 40 | MOSUR | 230/110 | 24-06-1999 |
| 41 | THANJAVUR (THIRUKANURPATTY) | 230/110/66 | 31-03-2000 |
| 42 | PUDUKOTTAI | 230/110 | 03-07-2000 |
| 43 | KADALANGUDI | 230/110 | 09-07-2001 |
| 44 | ACHARAPAKKAM | 230/110 | 28-12-2001 |
| 45 | TUTICORIN SIPCOT | 230/110 | 19-02-2002 |
| 46 | THATCHANKURCHI (SAMAYAPURAM) | 230/110 | 20-09-2002 |
| 47 | SANKANERI(WF) | 230/110-33 | 13-09-2004 |
| 48 | SALEM | 230/110/22 | 04-08-2005 |
| 49 | OTHAKKALMANDAPAM (MALUMICHAMPATTY) | 230/110 | 02-09-2005 |
| 50 | VEERANAM (WF) | 230/33 | 28-09-2005 |
| 51 | KODIKURCHI (AYIKUDI) | 230/110 | 05-10-2005 |
| 52 | KARIMANGALAM | 230/110 | 21-12-2005 |
| 53 | KILPAUK | 230/110 | 27-01-2006 |
| 54 | PUDANCHANDAI | 230/110 | 18-05-2006 |
| 55 | UDAYATHUR (WF) | 230/33 | 09-02-2007 |
| 56 | SIRUSERI | 230/33 | 29-03-2007 |
| 57 | PONNAPURAM | 230/110-33 | 10-06-2007 |
| 58 | TUTICORIN AUTO | 230/110 | 17-08-2007 |
| 59 | VALUTHUR | 230/110 | 10-09-2007 |
| 60 | RENGANATHAPURAM | 230/110 | 31-03-2008 |
| 61 | VEERAPURAM (MAHINDRA IND. PARK) | 230/110/33 | 19-05-2008 |
| 62 | PALLADAM | 230/110 | 28-05-2008 |
| 63 | SRIPERUMBUDUR SIPCOT (MAMBAKKAM) | 230/110/33-11 | 07-07-2008 |
| 64 | ORAGADAM | 230/110/33-11 | 06-08-2008 |
| 65 | AMUTHAPURAM WF | 230/33 | 01-12-2008 |
| 66 | NOKIA | 230/110/33-11 | 30-03-2009 |
| 67 | SADAYAPALAYAM(WF) | 230/33 | 28-10-2009 |
| 68 | BASIN BRIDGE | 230/110 | 28-10-2009 |
| 69 | KITS PARK (SHOLINGANALLUR) | 230/110/33-11 | 13-05-2010 |
| 70 | KAYATHAR | 230/110/66/11 | 19-07-2011 |
| 71 | NEMMELITHIPPIAKUDI (KARAMBAYAM) | 230/110 | 26-09-2012 |
| 72 | ATHIPATTU | 230/110/33 | 09-10-2012 |
| 73 | ALIYAR | 230/110 | 20-05-2013 |
| 74 | KOYAMBEDU CMRL | 230/110 | 11-07-2013 |
| 75 | NALLAMANAICKENPATTY | 230/110/11 | 29-01-2014 |
| 76 | MYLAPORE II (GIS) | 230/33 | 26-02-2014 |
| 77 | COIMBATORE | 230/110 | 16-07-2014 |
| 78 | PALLAKKAPALAYAM | 230/110 | 14-08-2014 |
| 79 | ANTHIYUR | 230/110 | 14-01-2015 |
| 80 | GUINDY(GIS) | 230/110 | 16-04-2015 |
| 81 | ALANDUR CMRL GIS | 230/110-33 | 29-05-2015 |
| 82 | THIRUVERKADU (HYBRID) | 230/110/33-11 | 08-10-2015 |
| 83 | THINGALUR | 230/110 | 05-12-2015 |
| 84 | ULUNDURPET | 230/110 | 18-01-2016 |
| 85 | OMEGA INDL.ESTATE | 230/110 | 22-01-2016 |
| 86 | VYASARPADI | 230/110 | 19-02-2016 |
| 87 | GURUBARAPALLY | 230/110/33-11 | 20-02-2016 |
| 88 | KARUVALUR | 230/110 | 03-03-2016 |
| 89 | SINGAPURAM | 230/110 | 02-05-2016 |
| 90 | ECHUR (PURISAI) | 230/110 | 08-08-2016 |
| 91 | KINNIMANGALAM | 230/110 | 12-01-2017 |
| 92 | TIRUCHULI (NEAR MUTHURAMALINGAPURAM) | 230/110 | 20-02-2017 |
| 93 | AMBATTUR 3RD MAIN ROAD | 230/110/33-11 | 30-03-2017 |
| 94 | POYYUR | 230/110 | 30-03-2017 |
| 95 | KURUKATHI | 230/110 | 31-03-2017 |
| 96 | R.A.PURAM | 230/33 | 21-04-2017 |
| 97 | VALAYAPATTY | 230/110 | 15-07-2017 |
| 98 | MONDIPATTY (TNPL) | 230/110 | 03-09-2017 |
| 99 | KUMBAKONAM | 230/110 | 05-10-2017 |
| 100 | JAMBUNATHAPURAM | 230/110 | 22-11-2017 |
| 101 | SAVASAPURAM | 230/110 | 31-03-2018 |
| 102 | PORUR GIS | 230/110 | 30-07-2018 |
| 103 | CENTRAL (CMRL) | 230/110 | 24-08-2018 |
| 104 | KANCHIPURAM | 230/110 | 07-09-2018 |
| 105 | NEYVELI | 230/110 | 29-10-2018 |
| 106 | UDDANAPALLY | 230/110 | 23-06-2019 |
| 107 | TIRUPPUR | 230/110 | 01-03-2020 |
| 108 | SANKARAPURAM AT KATTUVANNANJUR | 230/110 | 15-07-2020 |
| 109 | SAMAYANALLUR | 230/110 | 21-10-2020 |
| 110 | SHENBAGAPUDUR | 230/110 | 26-02-2021 |
| 111 | TNEB HEAD QUARTERS GIS | 230/33 | 26-04-2021 |
| 112 | THIRUPATHUR | 230/110 | 06-08-2021 |
| 113 | MAMBALAM UG | 230/33/11 | 24-09-2021 |
| 114 | THUVAKUDY | 230/110 | 24-10-2021 |
| 115 | KARUPPUR AT JAGIRAMMAPALAYAM | 230/110 | 16-10-2023 |
| 116 | SELVAPURAM (DAIS) | 230/110 | 05-07-2024 |
