Utility property is defined as "all real estate, buildings, and structures, machinery, dynamos, apparatus, poles, wires, fixtures of all kinds and descriptions, and pipe lines located within New Hampshire employed in the generation, production, supply, distribution, transmission, or transportation of electric powered or natural gas, crude petroleum and refined petroleum products or combination thereof, water, or sewage." The tax rate is $6.60 per $1,000 of value of utility property. On December 1 of each year the Department determines the value of utility property as of the previous April 1. The effective date was April 1, 1999. The tax is due annually on or before January 15th. Every corporation or company required to pay Utility Property Tax must file a declaration of its estimated Utility Property Tax for the subsequent taxable period. One-quarter (1/4) of the Utility Property estimated tax is due on April 15th, June 15th, September 15th, and December 15th.