The post title misses the important "without investment and changes in charging habits". Most EVs can already be controlled to set charging preferences to match lower cost, off-peak charging overnight. However, this isn't the full solution as it can create secondary demand peaks. For example, if everyone in one region has an off-peak rate starting at midnight, you will get a step-change in demand at that time. Midnight onwards may also not be the lowest carbon time to charge as this will change every day as renewables are not predictable. In California right now, charging during the day would have lower emissions Source: https://app.electricitymaps.com/zone/US-CAL-CISO
Many people are already thinking about this problem, including https://ev.energy. We go one step further and actively control EVs and EV Chargers to match their charging to when the grid is most clean. This may be overnight, but it could also be during the daytime when solar generation is highest. It is better for the grid not to use simple peak/off-peak pricing, but instead create tariffs that reward flexibility and move the exact charging times to best suit the grid.
Many people are already thinking about this problem, including https://ev.energy. We go one step further and actively control EVs and EV Chargers to match their charging to when the grid is most clean. This may be overnight, but it could also be during the daytime when solar generation is highest. It is better for the grid not to use simple peak/off-peak pricing, but instead create tariffs that reward flexibility and move the exact charging times to best suit the grid.