A little perspective..
Back in 2012, in the wake of the corporate bailouts, the companies pitting one city or state against another, etc., the New York Times put together a database and series of reports on such tax breaks, credits, and incentives. While $4.9 billion sounds like a lot, it's over the lifetime of the various companies, which according to the LA Times article, dates back to at least 2006 in SolarCity's case.
What the NY Times found was that in 2012, around $80 billion in such subsidies were happening each year. Texas alone accounted for $19.1 billion, and states like California, Michigan, New York, and Pennsylvania were all around the $4 billion per year mark. The database is here (full link: http://www.nytimes.com/interactive/2012/12/01/us/government-incentives.htm)
Of course, one could take issue with some of the assumptions in the LA Times article, such as including around $1 billion in the total for subsidies that were paid to customers who had a solar installation from SolarCity, rather than just the $500 million that SolarCity directly received for their own solar panel installations. But you could also argue that without such a subsidy, SolarCity would have never made the sales. Since we don't have a clone of the Earth with just that one difference, it's hard to say for certain.
Sad to say but receiving around $600 million a year in various subsidies, tax breaks, credits, and the like is not only par for the course, but a guiding principle of our so-called small government political party. Corporate welfare, as it's derisively described, is much more politically palatable to Republicans as they rename it job creation and talk about how great private enterprise is. I'm not a big fan only in that it represents a race-to-the-bottom as states try to one-up the next by enticing companies to expand or relocate through the use of property tax exemptions, sales tax exemptions, or other things that will last a decade or more, might get extended if the company makes noise about leaving or shutting down, and generally greatly underestimates the impact to a state's tax base and overstates the benefits of having that HQ or new factory.
Nothing to see here. Just move along.