; (ii) establishing nurseries to supply trees; (iii) purchasing trees; and (iv) preparing sites and planting trees; (B) the cost of maintaining and monitoring planted trees for a period of not more than 3 years; (C) the cost of training activities; and (D) any other cost determined appropriate by the Secretary. (3) Eligible entity The term eligible entity means each of the following: (A) A State government entity. (B) A local government entity. (C) An Indian Tribe. (D) A nonprofit organization. (E) A retail power provider. (4) Energy burden The term energy burden means the percentage of household income spent on residential energy bills. (5) Indian Tribe The term Indian Tribe has the meaning given the term in section 4 of the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5304 ). (6) Local government entity The term local government entity means any municipal government or county government entity with jurisdiction over local land use decisions. (7) Nonprofit organization The term nonprofit organization means an organization described in section 501(c)(3) of the Internal Revenue Code of 1986 and exempt from tax under section 501(a) of such Code. (8) Program The term Program means the program established under subsection (a). (9) Retail power provider The term retail power provider means any entity authorized under State or Federal law to generate, distribute, or provide retail electricity, natural gas, or fuel oil service. (10) Secretary The term Secretary means the Secretary of Energy.