While Tesla’s Gigafactory is bringing down the *financial* cost of batteries, the *energy* cost of building them is still the same. And that cost is huge. So huge that once counted in the energy accounting of a wind and solar system, it really starts to eat into the EROEI. Sure wind and solar have good energy profits on their own. But read the papers! Where are the energy costs for storage for a system that is only on a third of the time?