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Utilities one of the only sectors with positive sales, page-328

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    Truth the first casualty of war..

    The main area of concern is the mis-understadning of the cost of providing storage to support ever higher renewable energy usage.

    The figures for the amount of capacity of wind and solar generation (MW) sound impressive, but the actual level of renewable energy being delivered (MWh)is a very different picture.

    The cost of providing adequate storage is not widely appreciated. The linked article and others may assist to appreciate this challenge.

    There are other issues at a network level, with issues of clearing faults, which is not well supported by inverter-connected (ie wind, solar, battery) sources, compared to the mechanical inertia inherent in the synchronous generators that still provide much of our power, of course only when they are actually connected to the grid. The fault current from an invertor is the same as the full load current, where as can be many times higher for synchronous generator with inherently high inertia which can deliver multiple of its full load rated current, for short times, to clear faults. This is a costly issue to fix and that cist goes onto the bill under network charges. Existing synchronous generators may be suited for conversion to synchronous condensors.

    It is recommended in submissions by AEMO to the Essential Services Commission of South Australia, that Synchronous Condensers be mandated to be supplied by all new solar and wind generation developers. I would suggest a similar approach be taken to the provision of energy storage.

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