scotview wrote:Interesting post re the utility scale battery storage, thanks for posting. I'm trying to get an idea what that could supply, so:
Typical home uses say 50 kWh per day.
I make it that 730 MWh would supply 15 thousand homes for one day, in the event of a power cut.
Does that seem correct ?
Your usage per home numbers seem a bit high to me (but may be OK for USA-ian profligacy) as my house uses 3kWh/day, but nonetheless in the right ballpark for the intermittency use case, but read on.
There are various use cases for storage. My recollection - which may be wrong, my memory is imperfect - is that the Moss Landing use case is not for continuity of supply in the event of an outage from the incoming feeds. Instead my recollection is that the incoming feeds from the out-of-town power stations into this conurbation load are bottlenecked and cannot cope with the peak (early evening) usage. Note Moss Landing is/was fairly close to and within the conurbation area. So the storage is intended to peak-shave the load and thereby avoid the need to add additional HV cables from out-of-town just to carry the peak load for 30-mins every now and then. As someone who currently makes HV grid thingamijigs for a living anything that avoids grid reinforcement is a bad thing, but nonetheless this is a very valid use case. Given the price of real estate in most city centres, and the cost of putting cabling into these areas, and the sheer hassle of getting any HV cable past a nimby-city population, I think that quite a lot of storage will go into this or similar use cases.
As you can see the majority of work is done in the factory environment. What happens on site is minimal - drainage, ducts, gravel, some concrete pads, and hook-em-up ! The risk manager in my project heart would be overjoyed at all the avoided cost over-runs.