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Can renewable energy systems stand on their own feet? by Mike Rycroft, editor
 Alternative energy, renewable energy, green energy, clean energy, free energy etc.. all names for the same thing. All reflecting the idea of a limitless source of energy which only has to be harvested. Off-grid renewable energy systems have proved their ability to provide reliable power at an economic cost over many years of operation. Grid connected systems present a different situation... ( more) |
Brian Dames is new Eskom CEO
skom has announced the appointment of Brian Dames as chief executive with effect from July 2010. Dames is currently Eskom's chief officer, generation business. He was appointed to Eskom's executive management committee (Exco) in September 2004 after serving Eskom in various management positions. He joined the utility in 1987 as a graduate-in-training... (more)
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Interview with Eskom finance director Paul O'Flaherty by Chris Yelland, EE Publishers
Following the public announcement of Eskom's interim results for the financial year ending 31 March 2010, EE Publishers managing director Chris Yelland posed a number of questions to Paul O'Flaherty, Eskom's new finance director, on 9 June 2010... (more)
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Integrated Resource Plan for Electricity (IRP 2): the stakeholder engagement process explained by Chris Yelland, EE Publishers
Many stakeholders and interested parties may wish to participate in the development of IRP 2 but may not be aware of the stakeholder engagement process currently in progress, of the DoE website at www.doe-irp.co.za where information and documentation on the process, and of the time-lines involved may be obtained... (more) |
Municipalities should not increase their electricity prices by more than the Eskom increase by Stephen Dolk, NUS Consulting
According to the international utility pricing company NUS Consulting, the proposed increases for the average Eskom bulk user will see increases of approximately 8,5 c/kWh while the average municipal bulk user will be approximately 13,5 c/kWh (or more), a 60% higher increase in Rand terms than Eskom's customers... (more) |
Diary of an engineering wife: Reserve margin?
When my partner starts talking in "engineer", I become like one of those nodding dogs that people used to have in the back windows of their cars. My head nods, I give a toothy smile and my eyes glaze over. When 'reserve margin' was suggested as a topic for this column... (more) |
The Jacob Marley column: A moral tale...
Once upon a time, there was a country called Utopia where the word "corruption" was unknown and virtue reigned supreme, unlike in neighbouring Pragmatica. When the time came to build a new power station in Utopia, the state-owned power company Uskom decided make it a moral beacon in a sea of sleaze an corruption... (more) |
The future of energy in Africa: Winds of change
by Jay Wileman, GE Energy
Recent power outages underscore our growing energy requirements and demonstrated the need to focus attention on alternative energy sources. Globally, countries are looking to renewable energy as a cleaner alternative. Perhaps adding renewable energy to the pan-African energy mix could be one of the answers... (more) |
Biofuels: "Good" and "bad" biofuels, and worse economics - Part 5
by Chris Meyer, technical journalist
Sugar cane is undoubtedly one of the "good" biofuels, because it is difficult to see how growing sugar cane for bio-alcohol can really threaten food supplies. Maybe somewhat less sugar will be available, but one cannot live on sugar... (more) |
Wood as a fuel source for power stations in South Africa by Dr. H A van der Linde, WSP Energy Africa
Eskom recently published a "Request for Information" with the aim of conducting a study on the availability, sustainability, characteristics, logistics and costs of wood based biomass in and around South Africa. Biomass as a fuel source to generate electricity is not new... (more) |
Photo-voltaic (PV) system basics for dummies by Win Kurzyca, First National Batteries
There is a great lack of understanding and misinformation in the PV industry, not only amongst consumers but also amongst suppliers. Remember the dreaded load shedding days of 2008. Every vendor in and outside the industry tried to sell alternative energy solutions. The result was many unhappy stories... (more) |
Low temperature solar thermal energy conversion by S M Situmbeko, University of Botswana, and F L Inambao, University of KwaZulu-Natal, South Africa
Solar thermal energy conversion for power generation for both low and high temperature systems is an active area of research aimed mainly at addressing environmental and climate change concerns, but also as a possible complimentary avenue of tackling the current power supply deficits in Southern Africa... (more) |
Wind power transmission integration study for a small islanded power grid
by Paul M Tuson, Parsons Brinckerhoff
Parsons Brinckerhoff Africa was contracted to perform a power system and wind integration study for a 25 to 50 MW wind power plant (WPP) on the utility network, including an analysis of the wind capacity the client's network could sustain, grid strengthening and integration requirements, and the WPP specification limits... (more) |
Boosting capacity with dynamic line rating
Information from Areva T&D
The increasing drive for renewable energy source is putting pressure on operators to get the most from their power lines. A year-long site trial proves that a dynamic line rating scheme can raise transmission capacity. Changes in the mix of energy are having a big impact on power systems... (more) |
Advanced metering
Information from HP Enterprise Services
Merely changing a meter achieves nothing unless new technology features provided can change the ways that people and organisations use the product being metered. Some utilities have invested in advanced meter infrastructure without seeing any benefits that justify the capital investment that a full rollout represents... ( more) |
Development of standing waves on long distance HVDC transmission lines
by B R Duncan and J M Van Coller, University of the Witwatersrand
The Cahora Bassa HVDC scheme can transmit 1920 MW from Mozambique to South Africa. The DC line is experiencing numerous insulator flashovers. This paper describes an investigation into the possible existence of standing waves on the DC line... ( more) |
Energy assessments - The search for "negawatts"
by Terry Cousins, TLC Engineering Solutions
There are well documented incentives for consumers and energy suppliers to reduce electricity consumption, which will not only reduce the overall demand on the grid during peak periods but will also reduce the base load generation requirement... ( more) |
From light to power
by Jyrki Leppänen
Solar energy is witnessing stunning growth. About 4500 MW of PV capacity is being installed annually worldwide - a figure that was below 100 MW in 1996. This expansion is continuing exponentially, driven by national incentives such as feed-in tariffs... (more) |
Lightning and surge protection for photo-voltaic (PV) systems
Information from Surgetek
Home owners and private companies are installing PV systemms on their roof-tops. Because of the large space requirements of photovoltaic generators, these systems are especially threatened by lightning discharges during thunderstorms... ( more) |
Simulator for wind turbine control system software testing
by Samir Bico, Siemens Wind Power
The challenge - improving the automated testing of frequent software releases of Siemens wind turbine control systems as well as testing and verifying the wind turbine control system components in the development phase... ( more) |
More efficiency for 3-level inverters
by Norbert Pluschkeand Thomas Grasshoff, Semikron
Wind power has been in use for over 20 years now, with technical advances in this area leading to improvements in efficiency and reliability. The output of wind power units is steadily increasing, and so too is the need for efficient high power inverters... ( more) |
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