Complex sentence: Electricity Forward Agreement (calendar) (short: EFA system) is a calendar used by the to specify load profiles when trading on the electricity market official only valid until October 2014, but still abundantly used among commodity traders.
Split into simpler sentences: Electricity Forward Agreement (calendar) (short: EFA system) is a calendar used to specify load profiles when trading on the electricity market. It was officially only valid until October 2014, but is still abundantly used among commodity traders.