Asset Management Data | IPTO

Grid Asset Data

The key data of the Transmission System Equipment are set out below, as they stood on 31/12/2025.

Installed Transmission Line Lengths (routing length):
TRANSMISSION LINES (km)
TYPE OF LINES		400 kV	DC 500 kV	DC 400 kV	150 kV	66 kV	TOTAL
OVERHEAD LINES		3.066,84		106,95	8.888,28	37,49	12.099,56
SUBMARINE CABLES		6,6	674,24		1.066,29	72,2	1.819,32
SUBMARINE CABLES (underground part)		13,4			34,43	2,8	50,62
UNDERGROUND LINES		37,69	84,45		420,82		542,97
TOTAL		3.124,53	758,69	106,95	10.409,81	112,49	14.512,47

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

HVC - SWITCHING (400KV)		20	3	23
STEP-DOWN - SWITCHING SUBSTATION (150/20KV & 66/20KV)		219	5	224
SUBSTATION OF HV CUSTOMERS - MINES		41		41
STEP-UP (PRODUCTION STATIONS)		31	2	33
STEP-UP RES PRODUCERS		127		127
AC/DC TRANSFORMATION		3		3
TOTAL				451

Transformers and Transforming capacity - IPTO Fixed assets:
TRANSFORMERS
TRANSFORMER TYPE	VOLTAGE (kV)	NUMBER OF TRANSFORMERS	MVA CAPACITY
AUTOTRANSFORMERS	400/150/30	66	18.150
CONVERTER STATION TRANSFORMER	400	5	2.841
STEP-DOWN TRANSFORMER	150/66	2	50
SVC TRANSFORMER	150/20	3	218
TOTAL		76	21.259

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	10	2555
		150	172	11.273,4
		20	2	7
TOTAL			279	29.515,56
STEP-DOWN		150/20	460	19.713,5	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	94	2.779,6	HV CUSTOMERS
TOTAL			592	24.320,6
GENERAL TOTAL			871	53.836,16