The company I work for (as a data engineer) does utility scale solar + battery installation and site management. We recently finished a large scale installation just outside of Las Vegas (by some measures the largest in the US). It was backed by a PE firm. Costs are getting so low, the tech so predictable, and with battery warranties around 20 years the PE firm is able to get pretty high return with a fairly low risk. They enter into a "power purchase agreement" with the utility so they know how much they will be able to sell the power for, and as long as we collect data on the batteries they will be able to be warrantied if there is an issue (but there rarely are issues).
The batteries are by far the most expensive portion of the setup. The solar by comparison is dirt cheap. We have single axis tracking like mentioned in the article. Every day we fully charge the batteries, and discharge them in the evening.
replies(3):