without exploratory drilling, has put Romania's unproven wet shale gas technically recoverable resources (TRR) at a possible 1.4 trillion cubic metres (51 trillion cubic feet): the third largest deposit in Europe behind France and Poland. Energy company Chevron holds a number of concessions in Romania and has announced plans to begin exploration work there in late 2013. National energy corporation Petrom is also conducting preliminary analyses of its concessions and Romgaz, MOL, Sterling and East-West, and Zeta Petroleum have also all expressed an interest in further opportunities in Romania. Romania depends on imports to cover about 20% of its overall energy needs, according to data from the World Bank. Natural gas makes up close to 30% of national energy consumption. Of the total gas imported in 2010, (17% of the country's annual consumption) 98% of imports came from Russia. The recent US Energy Information Administration study has reported that there could be enough domestic shale gas to meet the country's needs for 100 years. Aside from job creation, Chevron has said that its investment alone in the country could total $600 million over the next 15 years. This is before the investment of other oil and gas exploration companies is taken into account. The Romanian government has come out in support of shale gas, citing energy independence and a decrease in the price of gas as motivations to pursue shale gas avenues. Energy Minister Constantin Niță has called for more exploration to determine the size of the shale gas deposits. Prime Minister Victor Ponta has also endorsed shale gas, saying he supports both exploration and exploitation. Sweden Royal Dutch Shell evaluated the viability of the Alum Shale in southern Sweden as a source of shale gas, but as of 2011 has declared that it is not viable and decided to abandon the operation. Other companies, e.g. Gripen Gas and Aura Energy continue to drill, prospect and report good finds. The company Gripen Gas completed test drillings outside Motala in the south-east of Sweden and reported that if all the gas were extracted, it would allow Sweden to keep up its current gas usage rate for 1,000 years. Gripen Gas announced in April 2012 the drilling results from their Ekeby Permit, onshore Sweden. Four shallow vertical wells tested the prospectivity of biogenic gas from the organic rich Cambro-Ordovician Alum Shale over an area covering about 150 km2. The prospective Alum Shale