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Transmission System

Existing Transmission System Description

The existing transmission system in northern Oman has three operating voltages, i.e. 400kV, 220kV and 132kV while in Dhofar it has only one operating voltage which is 132kV. The existing transmission system extends across the whole north of Oman and interconnects bulk consumers and generators of electricity located in the Governorates of Muscat, Batinah South, Batinah North, Dhahirah, Buraimi, Dakhliyah, Sharquiya South and Sharqiya North.

Following figures show the OETC transmission system at MITS and Dhofar by the end of 2021.

Number of Grid Stations at MITS by end of 2021

OHL & UGC Lengths (circuit/km) at MITS by end of 2021

Transformers Capacity (MVA) at MITS by end of 2021

Shunt Reactors (MVAr) at MITS by end of 2021

OETC Transmission System at Dhofar by end of 2021

OETC transmission system at MITS is interconnected with the transmission system of Gulf Cooperation Council Interconnection Authority (GCCIA) Grid through UAE (Transco Abu Dhabi) at Mahadha grid station through 220kV system. The interconnection links the electricity transmission network of Kuwait, Saudi Arabia, Bahrain, Qatar, UAE and Oman. This should increase the security of power supply and other benefits to the members’ countries in the form of cost savings from the sharing of spinning reserve, reserve capacity and energy trading. The 220kV interconnector between OETC and GCCIA has been energized and brought into service since 14th of November 2011. Oman has signed officially the agreement with the GCCIA in November 2014 and became a member of the GCCIA grid.

The OETC transmission system at MITS is also interconnected with the Sohar Aluminum system at 220kV via a double circuit cable that runs between SPS-1 on the OETC system and Sohar Aluminum 220kV busbar. The import or export schedule will vary on yearly basis as per OPWP and Sohar Aluminium Company agreement and this can reach up to 300 MW.

The OETC transmission system at MITS is also interconnected with the PDO transmission network at 132kV via a single circuit overhead line that runs between Nizwa in the OETC system and Nahadah in the PDO system. Under normal conditions, the power transfer across the interconnection is forecasted to be negligible, but in the event of an emergency on either networks the interconnection can facilitate a power transfer to address the shortfall. In addition, OETC transmission system at Dhofar is also interconnected with the PDO transmission network at 132kV via a single circuit overhead line that runs between Wind Farm at OETC system and Harweel at PDO system.

The transmission system at MITS area is supplied with electricity generated from eleven gas-based power stations located at Rusail IPP, Manah Power Plant, Al Kamil IPP, Barka I Power & Desalination Plant (ACWA), Barka II IPP (SMN), Barka III IPP, Sohar I Power & Desalination Plant, Sohar II IPP, Sohar III IPP, Sur IPP and Ibri IPP. In addition, the transmission system may be supplied from direct customers, such as Sohar Aluminum. The transmission system at Dhofar area is supplied with electricity generated from three gas-based power stations located at Raysut NPS, Salalah Power & Desalination Plant and Salalah II IPP and new wind farm located at Harweel with a capacity of 50 MW.

Four Distribution and Supply License holders, i.e. Muscat Electricity Distribution Company (MEDC), Mazoon Electricity Company (MZEC), Majan Electricity Company (MJEC) and Dhofar Integrated Services Company (DISC), take the bulk of the power transmitted through the main grid stations to supply the distribution systems.

In addition to the four distribution companies, seventeen large private customers are directly connected to the transmission system at the 220kV or 132kV levels.

In 2021, MIS gross peak demand was 6,637 MW, which occurred at 14:24:30 hours on 4th of July 2021 and represented an increment of 3.7% from the 2020 peak demand. During 2021, the electric energy delivered to the MIS from connected generating plants and other generators was 34,209.954 GWh whilst the exported energy from the MIS to the Distribution Companies was 33,979.547 GWh which has resulted in transmission system energy losses of 230.41 GWh, which equates to a transmission system energy loss of 0.67%

In 2021, Dhofar system gross peak demand was 568 MW, which occurred at 14:51:30 hours on 17th of May 2021 and represented an increment of 1.3% from 2020 peak demand. During 2021, the electric energy delivered to the Dhofar transmission system from connected generating plants and other generators was 3,347.436 GWh whilst the exported energy from Dhofar system to Dhofar Power Company was 3,306.957 GWh that has resulted in transmission system energy losses of 40.48 GWh, which equates to transmission system energy losses of 1.21%.