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High customer response scenario In light of the recent slowing of demand growth in the SWIS, the IMO has developed a high customer response scenario to indicate the possible range of peak demand growth over the forecast period. [...] While both the NEM and WEM are characterised by a sharp summer peak, the curve for the NEM shows better capacity utilisation than for the WEM, where the minimum load in the NEM was 47 per cent of the peak demand, compared with a minimum load in the WEM of 35 per cent of the peak demand. [...] For the NEM in 2013, demand exceeded 80 per cent of the peak demand for 38 days, or 10.4 per cent of the year and exceeded 75 per cent of the peak demand for 91 days, or 24.8 per cent of the year. [...] For the WEM, its demand volatility arises due to the high penetration of air-conditioning, variability of temperature (especially hot summer conditions) and the concentration of demand in a small geographical area; a hot day in Perth will affect the vast majority of customers in the SWIS. [...] For the WEM, 26 per cent of peak demand occurred for 10 per cent of the year, while in the NEM, 16 per cent of peak demand was required.