If I'm reading this correctly, the "world’s largest battery site: a 200-megawatt, 800-megawatt-hour storage station in China’s Liaoning province" has enough capacity to power 10% of Portland, Oregon's residential use for a day... and the article says this factory is producing 300 MWh of batteries per year right now ("eventually... 3 gigawatts per year").
Utility scale batteries are just for surge production; when the wind isn't blowing and the sun isn't shining within efficient transmission distance. Yet it seems like there is a lot of opportunity for more "20 soccer field" sized battery factories.
[TFA] 800 MWh battery
[0] 265,439 households
[1] 0.901 MWh per month, per average household
0.901 * 265439 = 239,160 MWh per month / 30.44 days per month = Portland's household consumption is 7,856.8 MWh per day
[0]: https://www.census.gov/quickfacts/fact/table/portlandcityore...
[1]: https://www.eia.gov/tools/faqs/faq.php?id=97&t=3
