The U.S. state of Arkansas is a significant producer of natural gas and a minor producer of petroleum. Though a small percentage of total consumption, its many waterways provide for a higher than average hydroelectric generation capacity. A higher than average solar exposure has recently begun to be taken advantage of in the state, with three solar photovoltaic generation facilities going online in 2016 and more under construction. Wind power potential is modest in Arkansas and the state has no utility-scale wind generation facilities. A network of 17 regional cooperatives, four investor-owned companies, and a number of municipal providers generate and deliver electricity to Arkansas customers. Five utilities deliver natural gas. Regulation The Arkansas Public Service Commission oversees all four of the state's natural gas utilities and 24 of its electric utilities. The commission lacks authority over 15 municipal providers. Policy Property assessed clean energy (PACE) Arkansas enacted property assessed clean energy (PACE) legislation in 2013. The law enables bonds to be issued in voluntarily created energy improvement districts that are then used to fund low-interest loans for renewable energy or efficiency upgrades. Cities Fayetteville and North Little Rock have since formed local energy improvement districts. Net metering Net metering rules in the state were first established by the Arkansas Public Service Commission in 2002 and were expanded in 2007. Energy generated by renewable systems up to 25 kilowatts for residential customers and up to 300 kilowatts for nonresidential is eligible. Under the law, utilities grant customers credits for excess energy fed to the grid. Unused credits at the end of a billing year are usable in the next billing year up to the customer's four-month average use in the previous year. Any additional credits are forfeited to the utility. Efficiency The American Council for an Energy-Efficient Economy ranked Arkansas 31st among the most energy-efficient states in 2017, down from 27th in 2016. Arkansas ranked 17th among fellow states in 2014 for overall per capita energy consumption. Electricity Arkansas consumed 48,194 million kilowatt hours in 2010. In 2012, the state exported 131 trillion more BTUs of electricity than it imported. Rates The average per-kilowatt-hour electricity rate in Arkansas was $0.08 in 2014, the fourth-lowest in the country. Rates by sector in 2014 were $0.10 for residential, $0.06 for industrial, and $0.08 for commercial. Generation In 2014, Arkansas had 14,754 megawatts of net summer generating capacity and generated 62 million megawatt