While billions have been provided to rebuild Iraq's oil and electricity sectors, Iraq's future needs are significant and sources of funding uncertain. For fiscal years 2003 through 2006, the United States made available about $7.4 billion and spent about $5.1 billion to rebuild the oil and electricity sectors. The United States spent an additional $3.8 billion in Iraqi funds on the two sectors, primarily on oil and electricity sector contracts administered by U.S. agencies. However, according to various estimates and officials, Iraq will need billions of additional dollars to rebuild, maintain, and secure Iraq's oil and electricity sectors. The Ministry of Electricity estimates that about $27 billion will be needed to meet the sector's future rebuilding requirements; a comparable estimate has not been developed by the Ministry of Oil. Since the majority (about 70 percent) of U.S. funds has been spent, the Iraqi government and the international donor community represent important sources of potential funding. However, prospects of such funding are uncertain. First, the Oil and Electricity Ministries have encountered difficulties spending capital improvement budgets because of weaknesses in budgeting, procurement, and financial management. As of November 2006, the Ministry of Oil had spent less than 3 percent of its $3.5 billion 2006 capital budget to improve Iraq's oil facilities. Second, Iraq has not made full use of potential international contributions and it is unclear what additional financial commitments, if any, will be provided to Iraq's oil and electricity sectors as part of a new international compact (agreement), according to U.S. officials. As of March 2007, donors had committed $580 million in grants for the electricity sector and had offered loans for oil and electricity projects; however, Iraq has not accessed these loans in part due to concerns about its high debt burden.