Battery Technology is a bit of a handy distraction. The only solution is to move the "Duck Curve" to later in the day. So use batteries? well yes if you use them at the household WITHOUT solar. If you have solar + batteries you just increase the duck curve You can use centralized batteries but that probably means major upgrades to the distribution infrastructure. If the power companies would charge according to cost of supply (so ALL power is cheaper during the Duck Curve period) so you can charge the home battery during "duck Curve" and use it ONLY during the evening peak. But most power companies have multiple generator technology and use power generated by "cheaper" generators to subsidize the costly overnight or non renewable generation.