Asset Management Data | IPTO

Grid Asset Data

The key data of the Transmission System Equipment are set out below, as they stood on 30/09/2025.

Installed Transmission Line Lengths (routing length):
TRANSMISSION LINES (km)
TYPE OF LINES		400 kV	DC 400 kV	150 kV	66 kV	TOTAL
OVERHEAD LINES		3.047,32	106,95	8.894,31	37,49	12.086,07
SUBMARINE CABLES		6,6		1.066,29	72,2	1.145,09
SUBMARINE CABLES (underground part)		13,4		34,43	2,8	50,62
UNDERGROUND LINES		37,69		401,84		439,53
TOTAL		3.105,02	106,95	10.396,86	112,49	13.721,31

Transformer and Switching Substations which contain IPTO assets:
SUBSTATIONS WITH IPTO ASSETS
TYPE		TRANSFORMER	SWITCHING	TOTAL SUBSTATION

HVC - SWITCHING (400KV)		19	4	23
STEP-DOWN - SWITCHING SUBSTATION (150/20KV & 66/20KV)		219	5	224
SUBSTATION OF HV CUSTOMERS - MINES		40		40
STEP-UP (PRODUCTION STATIONS)		31	2	33
STEP-UP RES PRODUCERS		120		120
AC/DC TRANSFORMATION		1		1
TOTAL				441

Transformers and Transforming capacity - IPTO Fixed assets:
TRANSFORMERS
TRANSFORMER TYPE	VOLTAGE (kV)	NUMBER OF TRANSFORMERS	MVA CAPACITY
AUTOTRANSFORMERS	400/150/30	65	17.870
CONVERTER STATION TRANSFORMER	400	1	597
STEP-DOWN TRANSFORMER	150/66	2	50
SVC TRANSFORMER	150/20	3	218
TOTAL		71	18.735

Transformers of Users Connected with the Transmission System:
TRANSFORMERS
TYPE		VOLTAGE (kV)	NUMBER OF TRANSFORMERS	MVA CAPACITY	USER
STEP-UP (CONVENTIONAL PRODUCTION AND HYDROELECTRIC STATIONS)		400	22	9.279	PRODUCERS
		150	73	6.401,16
STEP-UP RES PRODUCER		400	7	1760
		150	167	10.818,4
		20	2	7
TOTAL			271	28.265,56
STEP-DOWN		150/20	460	19.688,5	HEDNO
STEP-DOWN		66/20	1	25	HEDNO
STEP-DOWN		150/20	5	212	PRODUCERS
STEP-DOWN AUXILIARY		150	22	1.090,5	PRODUCERS
STEP-DOWN		150/20	10	500	PPC / MINES
STEP-DOWN		150/MT	92	2.679,6	HV CUSTOMERS
TOTAL			590	24.195,6
GENERAL TOTAL			861	52.461,16