Take a look at "Fourth Quarter 2013 Earnings Conference Call" deck from Feb 24, 2014 -
slide 8. Their costs came down by aprox 40% within a span of 1.5 years! If you look at Lyndon Rive videos on YouTube you will see they successfully navigated through each of the state incentive reductions. They are very well equipped to deal with the ITC cuts. In fact they are already reducing their dependency on tax equity funds by raising capital through syndicated loans, asset backed securities, etc. Also a crowd sourcing platform is in the pipeline. Overall, I don't see anything to worry about here.
To add, I believe Solarcity had developed a cost reduction road map back in 2012 in preparation for incentive reduction. The goal was set at 5% in cost reductions per year. They currently are reducing costs 6 times faster then 5% annually, so very, very much ahead of schedule here. This essentially puts them 5 years ahead of projections. I'm not sure how much further they can go down, there has to be a slowdown of reductions at some point, but right now they are really executing extremely well.
The 30% ITC reductions in 2017 affects everyone in the solar industry, not just Solarcity. Since there will no longer be a 30% tax credit on your purchase, $0 down loan payback periods get extended from 3-4 years to potentially 7-8 years, which could be a deal breaker for a potential customer. I think the average home owner owns their home for 10-11 years before selling, so having to wait potentially 8 years for payback on PV system might be too long. The $0 down loan market might show signs of deceleration and get hit hard. Leasing market gets hit because of the tax equity investor no longer becomes a source of capital, as well as the installation company's access to the ITC for its own cost reduction strategies.
Everyone gets hit. However, those that reduce costs the best, will be the big winners here in the residential market. If they can reduce costs to the point the 30%ITC doesn't matter, then they will be able to continue rapid growth in massive market with extremely low penetration. Solarcity is positioning itself very well with its fantastic execution on cost reductions. But just as important, as Teslafan123 points out, they are shifting nicely to non-tax equity investor sources of capital, such as their solar ABS, and crowd sourcing ABS product coming out later this year. No other solar energy company has done this yet, Solarcity is the only one right now. Given this status at the moment, Solarcity is proving to be the only solar energy company prepared for the post 30% ITC world.
The next major hurdle for the solar industry is dealing with net metering reductions and the utilities. The solution to that is energy storage. Energy storage is the absolute future of the Solar industry. Without it, the utilities will always be in control of its destiny. As we can see from what happened in Arizona last November, utilities can change net metering agreements, quite literally, overnight. So energy storage is top priority. Solarcity, again, is positioning itself to the first with a low cost energy storage solution through its partnership with Tesla. No one else has this advantage. I have a strong feeling California Public Utility Commission will get the Solarcity energy storage hook up issues resolved soon. California has a strong mandate to achieve 1.3GWs of energy storage by 2020 and current intentional "road blocking" by all the California utilities will soon dissipate. As those road blocks start to fade, Solarcity has a long queue of customers waiting to get the battery installed immediately. Elon also stated in his Amsterdam talk that he wanted to begin a volume energy storage roll out by the end of 2014 at the earliest and in the first half of 2015 at the latest... so the feeling to me is that energy storage is going to happen sooner then later.
Overall, with accelerated cost reductions and the roll out of low cost energy storage, Solarcity is currently positioning itself above every other solar power company to thrive post 30% ITC world as well as post net-metering...