In response to plunging oil prices, state-owned energy firm PTT Plc is urging policymakers to take action to cut the nation’s crude oil reserve in half as prices dip below US$30 a barrel. President and chief executive Chansin Treenuchagron said PTT will urge the government to reduce the volume of its oil reserve to 9-10 days worth of daily production for crude oil, down from the current volume of 18-20 days.