transmission lines are of voltage levels 132kV, 88kV, 66kV and 33kV.
However, there are places where LEC distributes with 33kV like Thabana
Morena in Mafeteng. The transmission voltages are stepped down to
distribution voltages through 45 substations of which six of them namely
Mabote, Mazenod, Maputsoe, Ramarothole, Litsoeneng and Khukhune
Substations are critical for the supply of electricity countrywide.
Qacha's Nek and Mokhotlong districts are the only districts that are not
connected to the main national grid.
Distribution network distributes power from substations to electricity
users. The Distribution network ranges from the voltage of 11kV up to
the customers supply at 220V and 380V. The transmission and distribution
network form the LEC core business, without them and its customers, LEC
does not exist.
department performs planned and unplanned network maintenance to keep
LEC network assets in an operational status. Planned maintenance is
whereby defects are identified through inspections, oil analysis,
infrared scanning and other tests and are rectified before failure
occurs. Most of critical planned maintenance facing LEC is refurbishment
of dilapidated switchgear, 33kV and 11kV worn-out wooden pole
structures and upgrading of conductors that are limiting capacity.
Another massive preventative maintenance include circuit breakers and
other substation equipment tests and assessing and maintaining of
transformer on-load tap-changers (OLTC's) in all the transmission
substations. For the past years LEC has maintained availability of
supply to more than 99% on the transmission network and to around 95% on
the distribution network.
maintenance (faults) are dominating planned maintenance. Fault is an
emergency power outage caused by many factors including but not limited
to ageing network, harsh weather conditions and vandalism of network. In
the recent years acts of vandalism have increased in a high rate
resulting in engagement of bulk of LEC resources to restore power. There
are time-lines set by the Regulator for restoration of faults that LEC
has to comply with and LEC is partly complying because of the magnitude
of unplanned power outages.
Other departmental roles include testing of installations, surveying,
generating quotations and implementing service connections in the nine
districts outside Maseru. These activities that relate to customer
connection are initiated by customers that come to apply for electricity
connection at LEC. There are time-lines set by the Regulator that LEC
has to comply with in providing these services.