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Battery installation in 2018 in US 777,000 kWh = B. Total US electricity use 3820 billion kWh/yr = U. Length of time US batteries installed in 2018 can store average US electricity demand = (3.154e7 s/yr) * (B / U) = 6.4 seconds. https://www.statista.com/statistics/201794/us-electricity-consumption-since-1975/ …https://www.greentechmedia.com/articles/read/us-energy-storage-broke-records-in-2018-but-the-best-is-yet-to-come …
Only 876 MWh of grid storage in batteries in US at end of 2017. Less than 8 seconds of average US electricity demand. https://www.eia.gov/analysis/studies/electricity/batterystorage/ …pic.twitter.com/n5CPfbitmd
They call him a "renewable basher" or that "he doesn't get things" but I nevertheless liked his particular rant:https://twitter.com/DeepShort7/status/1097932216896835584 …
How long before an installation has to be replaced?
What's the context? It feels a bit of a strawman. Is anyone really suggesting batteries will be the primary grid-scale 4 multiple-day storage. Plans like CAT's ZCB envisage large synth-gas. Chemical storage has many benefits; can use existing infrastruct.https://www.cat.org.uk/info-resources/zero-carbon-britain/research-reports/zero-carbon-rethinking-the-future/ …
I'm not an expert on this, but it seems like even though capacity is small at this point, the benefit may be large, as in Australia: https://www.afr.com/business/energy/solar-energy/south-australias-big-battery-slashes-40m-from-grid-control-costs-in-first-year-20181205-h18ql1 …
How many days/weeks/months of storage do you think would be material? How about the physical & fiscal impact of 10% of average peak per ISO/RTO? It is an interesting stat - also, total ES in 2018 < 1 med Gas Turbine... but > important.
A bit harsh. Batteries are not yet cost effective for large-scale storage like pumped hydro (but it's close). They are used for grid frequency regulation, allowing decommissioning of always-on coal plants. So it's a bigger effect than you think.http://bit.ly/2IWHUia
Batteries are not meant to run the whole grid 
Pumped hydro is the best option for large scale energy storage.
Batteries are used for other purposes - check out what we’re doing in Australia @KenCaldeira - a combination of renewables, pumped hydro and batteries is best option
The environmental cost of storage matters, no doubt about that. We can do so much better toward that goal with what we already have. Multi-use kinetic filtering systems, better insulation, ...
Insert pin tweet here. 
If they improve that by 1,000 times, then they’ll be at 1%. How long do these batteries last before they need replacement ?
The key question is "and how much did that cost, and how long will they continue to work" That answer is far more disturbing than the miserably short discharge time.
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