If anyone was curious about the funding for this (I was), EnviroMission has a press release on their site [1]. "The Southern California Public Power Authority (SCPPA) has taken a call option to purchase the first of two EnviroMission 200MW Solar Tower power stations planned for development in La Paz County, Arizona." It does seem odd, though, that they are building these in Arizona when California has its own deserts.
If I were to guess, the regulatory burden of putting something up like this in Arizona is probably way lower than putting it up in California. So, not that odd given that both sides are plugged into the grid and California already buys power from far away (like the Pacific NW.)
[1] http://www.enviromission.com.au/EVM/Company/ShowPage.aspx/PD...