Real Estate Investor Magazine South Africa September 2013 | Page 43

COMMERCIAL
South Africa include signif icant gas f inds in Mozambique, the shale gas potential of South Africa and the regional availability of liquefied natural gas (LNG). In particular, the regional availability of LNG offers exciting opportunities for the creation of gas supply nodes in all of the South African coastal metros. An adequate supply of natural gas could be made available to realise the CHP potential of South Africa. A positive driver for CHP development in South Africa is the Absa Energy project in central Johannesburg which is the only commercial scale CHP project supporting an office campus. The other CHP and trigen projects in South Africa are small scale and support only a relatively small part of the site load. The Absa project provides an example of the proper implementation of the technology, lowering the risk for projects to follow. buildings were retained and an additional 6MW of emergency diesel generators were installed to supplement the gas generators under power failure conditions. This provides an exceptional level of security of supply with the Campus able to be supported by the utility supply, gaspowered generation or local diesel generation. The Energy project required the Campus to be ring-fenced outside the City Power network with a new utility supply point and internal distribution. An intake substation was built to provide a new centralised intake point. New internal MV distribution at basement level links all buildings. The sleeve network linking the basements provides routes between buildings for MV electrica l distribution, low temperat ure hot water distribution and chilled water distribution. Approximately 10 0 sleeves ranging from 200mm to 700mm diameter were drilled between the basements of all the Campus buildings. The gas engines operate from 06h00 to 20h00 weekdays and Saturdays under the control of two operator shifts. The Campus load as seen by the utility is controlled at the night time load demand by varying the level of own generation. This provides a f lat load prof ile resulting in low maximum demand charges. The load profile is regularly monitored and optimised to minimise operating costs. Diesel Electric Services are responsible for the operation of the Energy Centre for Absa. Monitoring and optimisation is undertaken by Single Destination Engineering. The Energy Centre is supplied with natural gas from t ???????????????????????????????????????????)???????????Q??????????????????????????????????????????????5\?????????????????????????????)?????????????????????????????????????M?????????????Q????????????????????????????????????????????????????????????????????????????????????????????????????)??????????()
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