the Navajo Nation were $608,000 as of 2012. Air permit fees paid to the Navajo Nation EPA were about $400,000 per year. Property taxes paid to the State of Arizona were about $4.8 million per year. Since 2011, payments in lieu of taxes have also been paid to the Navajo Nation at half the Arizona tax rate, or about $2.4 million per year. Lease extension Plant owners and the Navajo Nation negotiated terms for a 25-year extension to the original lease that ended in December 2019. Proposed lease payments under the extended lease would increase to $9 million per year beginning in 2020. The terms also include 'Additional Payments' in lieu of taxes and other compensation, starting at $10 million per year following approval by the tribe and escalating to $34 million in 2020, although prorated if one or more units are retired or permanently de-rated. Payment terms, stated in 2011 dollars, would be adjusted annually based on the consumer price index (CPI). Due to CPI adjustments, actual payments by 2020 had been projected to be around $52 million/year. As of 2013 permission to operate as a conventional coal-fired plant was anticipated until December 22, 2044. Because the new lease was not approved, the station would shut down by the end of 2017 if decommissioning is to be finished by original lease end in 2019. Mine employment and royalties The Kayenta mine has 430 employees, and pays about $47 million per year in total wages. Coal royalties are paid at 12.5% of gross proceeds, as on federal BLM lands. The royalties and other mine payments amount to about $50 million per year, $37 million paid to the Navajo Nation and $13 million to the Hopi tribe. Impact on regional economies NGS and Kayenta Mine payments in 2012 accounted for about a quarter of the Navajo Nation's revenues, and 65% of the Hopi Tribe's revenues. Native American tribal members, mainly Navajo, make up 83% of plant employees and 93% of mine employees, resulting in about 850 direct tribal positions. Indirectly, plant and mine operations support the equivalent of about 1,600 full-time positions. With increased lease and royalty payments, by 2020 the plant and mine had been expected to generate more than 2,100 indirect jobs for the Navajo Nation alone, if all three units continued running. The cumulative economic impact on the state of Arizona as a whole for the time period