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? Where are the energy cost measurements for winter, when there’s far less sunlight? How much storage is required, and forget financial cost, how much *energy* is it going to cost to build storage for an energy system that is *mostly* off!?
If we include the *energy* cost of all the batteries required (because we’re moving from a power system that is mostly ON to mostly OFF), the sheer energy required to build all those batteries in the first place eats into the EROEI of wind (around 30?) and the EROEI of solar PV (around 7?) till wind is only 3 and solar PV’s struggling to break even!
Today’s nukes have an EROEI of 75, and that includes moving millions of tons of rock to get to the uranium. Tomorrow’s nukes won’t need to do that, because they’ll eat the nuclear waste which could bless them with an EROEI in the high hundreds, some say even over a thousand!