Exemplary embodiments are directed to wireless charging. A charging system may comprise at least one power generation system configured to convert renewable energy to another form of energy and convey the another form of energy. The charging system may further include at least one transmit antenna coupled to the at least one power generation system and configured to receive the another form of energy from the at least one power generation system. Further, the at least one transmit antenna is configured to wirelessly transmit energy to at least one other antenna positioned within an associated coupling-mode region.