OP is correct. Negative prices stokes battery storage deployment. See California and their ~52GW storage target (currently @ ~10GW), because of negative prices and the duck curve. California utility scale storage soaks up solar during the day (when spot prices approach zero or go negative), and discharges most profitably right after sunset for ~4 hr (but occasionally, right before sunrise when demand is ramping before the sun is up). If spot prices rise during daylight hours, you add more solar generation to push them back down.

https://www.gov.ca.gov/2024/04/25/california-achieves-major-...

https://www.energy.ca.gov/data-reports/energy-almanac/califo...

https://cleantechnica.com/2024/06/02/solar-passes-100-of-pow...

https://futurism.com/the-byte/california-solar-electricity-p...

https://app.electricitymaps.com/zone/US-CAL-CISO?wind=false&...