Regional Authorities and Special Districts - As enacted, requires that interest income accruing on investments and deposits as a result of the Megasite Authority of West Tennessee's collection of rates to customers of a water system or wastewater system operated by the authority be credited to a separate account and carried forward into each subsequent fiscal year. - Amends TCA Section 64-9-107.

HB 1309 amends Tennessee law to require the Megasite Authority of West Tennessee to credit interest earned from investments related to water and wastewater system rates into a separate account. This interest must not revert to the general state fund and must be carried forward annually to support the authority's operations. The bill directly affects the Megasite Authority's financial management of utility system revenue. It makes no changes to how rates are set or who pays them, only altering the handling of accrued interest income. (This is a procedural bill with no direct impact on residents or businesses beyond the authority's accounting procedures.)