(Phoenix, AZ) Proposition 127, the clean-energy ballot measure is now the most expensive in Arizona history. The latest campaign finance reports show that groups for and against the measure that would require electric companies to get half their power from renewable sources by the year 2030, have now spent about 40-million dollars. A group backing the measure, funded by California billionaire Tom Steyer, has spent 17.6 million dollars. The parent company of APS has spent 21.8 million dollars fighting the proposal. Both sides still have money left and are spending it ahead of the November 6th election.