It depends on their treaty status, and whether or not they have the authority to self-permit. Some things are subject to state and county special purpose agency approval (CWA and wastewater discharge permits, etc.), but they're generally CEQA exempt, and many can do their own discretionary permits.
There were a couple of large energy developers out there trying to do a semi-large peaking plant, but there's not enough gas.
What I'm talking about is actual Viejas projects, expanding even further on what they're currently doing out there. If they go ahead, it's going to be pretty major league, but they're just doing initial planning and haven't done any of the outside community relations work.
A lot of the obstacles to California Indian gaming (which is the economic engine for all their other projects) were created by Davis and the governors office, who were heavily supported by Nevada casino interests.