; grid The terms applicable power grid and grid mean a power grid overseen by an eligible entity. (2) Assistant Secretary The term Assistant Secretary means the Assistant Secretary of the Office of Energy Efficiency and Renewable Energy of the Department of Energy. (3) Cellular phone application The term cellular phone application means a software application that enables the performance of specific tasks that may be run on a computer, a mobile device, the internet, or any other electronic device. (4) Clean energy source The term clean energy source means a fuel, electrical, or energy source that significantly limits or avoids greenhouse gas emissions, as determined by the Secretary. (5) Eligible Entity The term eligible entity means an independent system operator, regional transmission organization, or other transmission system operator. (6) Independent system operator The term independent system operator has the meaning given such term in section 3 of the Federal Power Act ( 16 U.S.C. 796 ). (7) Load The term load means the total amount of electrical power that is demanded by users of the grid. (8) Regional transmission organization The term regional transmission organization has the meaning given such term in section 3 of the Federal Power Act ( 16 U.S.C. 796 ).