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Data & Statistics

Tunisia: Growth in Electricity Transmission Network [free access]

July 10, 2018

At the end of 2017, Tunisia’s transmission network comprised 5,175 km of lines at the 150 kV and above voltage levels. Tunisia’s high voltage line network has increased at a CAGR of 1.8 per cent since 2013. The country also has about 1,285 km of 90 kV lines.

 

Of the total, about 54 per cent of the transmission lines are at the 225 kV level. Since 2014, no new 400 kV line has been added to the grid.

 

The Tunisian network is interconnected with the Algerian grid via five lines. These include two 90 kV lines, a 150 kV line, a 225 kV line and a 400 kV line. Two 225 kV interconnections with the Libyan network also exist, but are currently not functional.

 

Table 2: Growth in Tunisia’s transmission line length (km)

Voltage

2013

2014

2015

2016

2017

150 kV

1,993

2,067

2,157

2,157

2,157

225 kV

2,717

2,669

2,790

2,885

2,810

400 kV

117

208

208

208

208

Total

4,827

4,944

5,155

5,250

5,175

Annual growth rate (%)

-

2.4

4.3

1.8

(1.4)

Source: Société Tunisienne de l’Electricité et du Gaz; Arab Union of Electricity; Global Transmission Research

 

Tunisia’s transformer capacity stood at 10,015 MVA at the end of 2017. Since 2013, transformer capacity has increased at a CAGR of 5 per cent. The majority, or about 55 per cent, of transformer capacity was at the 225 kV level, while the least share (16 per cent) was at the 400 kV level.

 

STEG holds the sole responsibility for transmission and distribution (T&D) networks across the country.

 

Table 3: Growth in Tunisia’s transformer capacity (MVA)

Voltage

2013

2014

2015

2016

2017

150 kV

2,775

2,800

2,810

2,965

2,860

225 kV

4,660

4,960

5,040

5,140

5,555

400 kV

800

1,600

1,600

1,600

1,600

Total

8,235

9,360

9,450

9,705

10,015

Annual growth rate (%)

-

13.7

1

2.7

3.2

Source: Arab Electricity Union