I predict that long before 2030 we will have long lasting batteries for less than $50/kWh everywhere. Your house will get a 20 kWh battery costing just $1000 that will earn itself back in less than three years and make sure your electricity use never peaks during the day, that your voltage hardly fluctuates, and that you will never experience a blackout again. Companies and business parks will buy larger batteries that quickly solve their grid congestion woes.
Source: Batteries: how cheap can they get? – by Auke Hoekstra