Tesla says its new Megablock can cut costs for renewable energy storage.

At an event in Las Vegas yesterday, Tesla revealed a new utility-scale battery configuration that it claims can significantly lower construction costs for utilities, along with faster installation. Its new “Megablock” is pre-engineered; more assembly done in a factory allows for 23 percent faster installation, according to Tesla. That’s supposed to translate to up to 40 percent lower construction costs.It’s essentially supposed to be a plug-and-play platform, incorporating hardware and software services, to help utilities quickly meet rising electricity demands from data centers...