PHEVs’ impact on peak electricity demand varies significantly by region due to differences in charging behavior, grid composition, and dispatch strategies:
Timing and Charging Patterns
Peak demand occurs in the early evening (4–10 p.m.) for personal-use PHEVs and mid-afternoon to evening (2–7 p.m.) for commercial fleets on weekdays. Nighttime charging shifts load away from peak hours but increases coal dependency in some regions.
Regional Grid Mix Differences
- Midwest U.S.: Coal-heavy grids may see reduced CO₂ emissions per MWh due to PHEV charging displacing higher-emitting marginal generators during off-peak periods.
- Clean Energy Regions: Areas with hydro or renewables may experience increased CO₂ intensity if PHEV charging coincides with periods requiring fossil fuel peaker plants.
Infrastructure and Load Management
The VACAR region (Southeast U.S.) analysis shows PHEV charging demand could range between 1,400–6,000 MW depending on timing. Off-peak charging reduces peak strain but alters emission profiles. Early evening charging raises peak loads significantly, particularly in regions with limited transmission capacity.
Effectiveness by Scenario
Regions with strong renewable integration and managed charging programs are better positioned to mitigate peak demand impacts. The Midwest demonstrates potential for emission reductions when charging aligns with grid conditions, while cleaner grids face trade-offs without smart charging coordination.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/are-there-specific-regions-where-phevs-are-more-effective-in-reducing-peak-electricity-demand/
