The Noon Effective Temperature is a weighted average temperature using the noon temperature from three days. Todays temperature is given the weight 0.57, then 0.28 on the day before that and 0.15 on the day before that. This calculation takes into account temperature lag, where electricity demand today is influenced by the temperature over the last few days. Note: Net is calculated by the SVAA using data provided by the temperature provider (Met Office).