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SPARKS
ELECTRICAL NEWS
SEPTEMBER 2017
CONTRACTORS’
CORNER
6
R
emote projects that are far from national
power grids will tend to pay a premium for
generating their own energy; so they need
to plan carefully to use it as efficiently as they can.
This is the advice of Zest WEG Group CEO Louis
Meiring, who emphasises the opportunities pre-
sented by modern technology to reduce energy
consumption in just about any industrial or mining
enterprise.
“Savings of 3 to 5% of energy consumed on site
are a realistic target for most projects, especially if
the enabling technologies and equipment can be
incorporated into the design at an early stage,” says
Meiring. “As a group that offers power generation
solutions as well as energy efficiency technologies,
we can readily identify and quantify the efficiency
benefits for customers.”
He says the potential savings lie not only in the
operating cost of the standalone power generating
facility, but in the capital expenditure for construc-
tion, as better utilisation efficiencies can reduce the
maximum output capacity required from the plant.
Alastair Gerrard, managing director of Zest Ener-
gy, says his company – which specialises in power
supply solutions – works closely with EPCMs or
directly with customers to plan and implement op-
timal solutions. This approach ensures that equip-
ment life cycle costs are well controlled and con-
tribute to overall project efficiency.
“In addition to ensuring the right power genera-
tion solution for customers, we enhance our value-
add through our knowledge of exactly how the
generated energy can be best used,” says Gerrard.
“WEG’s high efficiency, IE3 rated motors, for in-
stance, can reduce the power consumed in a range
of industrial functions such as pumping, conveyor
systems and ventilation.”
Zest Energy recently installed a turnkey diesel
power generation facility for the Balama graphite
project in a remote region of Mozambique. Tech-
nology options such as variable speed drives can
further enhance efficiencies and reduce the con-
sumptive demands that a standalone power plant
will have to meet; regeneration strategies also low-
er costs by feeding power back into the network.
“There is also potential for ‘heat and power’ co-
generation as an efficiency strategy,” says Gerrard,
“where heat can be drawn off equipment like en-
gines to feed back into plant functions, rather than
being dissipated with no benefit.”
He sees a trend among many industrial users
towards pursuing higher energy efficiencies, as
this can improve the cost-per-hour of running
their assets and lead to a reduction in emissions
by using more efficient technologies. “There is
also a growing interest in hybrid solutions that can
incorporate renewable energy sources like solar
and wind, alongside traditional fossil fuels,” says
Gerrard.
A wide footprint across Africa – including its
own entities in Namibia, Zambia, Tanzania, Mo-
zambique and Ghana – allows the Gauteng-based
Zest WEG Group to implement and service pro-
jects to high standards.
Enquiries:+27 (0)11 723 6000
SELF-GENERATED POWER NEEDS
SPECIAL FOCUS ON EFFICIENCY
The custom engineered diesel generator set solution for
Syrah Resources' Balama graphite project.
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