The Australian Energy Market Operator (AEMO) has issued a 'threat notice' warning of potential gas supply shortages on the east coast due to a cold snap, reduced renewable energy generation, and issues at the Longford gas plant. This situation has led to a run on gas storage facilities, high prices, and risks of peak day shortfalls in gas supplies, affecting states like Victoria, New South Wales, and South Australia. Gas demand has surged for heating during the winter months, exacerbating the strain on supplies. AEMO has urged industry players to boost production and consider measures to alleviate the gas supply constraints to prevent a major crisis.