California’s Electrification Challenge: Bigger Electrical Services or Smarter Energy Management?

California’s transition to an all-electric future is driving unprecedented demand for electrical capacity. New homes are increasingly being designed with EV chargers, heat pumps, electric water heaters, Electric cooking, and other high-power electrical loads.

Traditionally, meeting these new load requirements has meant upsizing the electrical service for example, increasing a home’s service from 200A to 320A or 400A. However, this approach comes with significant challenges.

Electrical service upgrades are often expensive, require utility approval, and may involve transformer or distribution system upgrades that can take months to complete. For many home builders and developers, these additional costs increase construction expenses and ultimately make new homes less affordable.

A smarter approach is to maximize the capacity of the existing electrical service through an Energy Management System (EMS).

The 2023 National Electrical Code (NEC) recognizes Energy Management Systems as a code-compliant method for managing electrical demand.

Relevant NEC provisions include:

• NEC 220.70 – Permits Energy Management Systems to be considered in feeder and service load calculations.
• NEC Article 750 – Establishes the requirements for Energy Management Systems, including installation, operation, and safety.
• NEC 625.42(A) – Permits Electric Vehicle Supply Equipment (EVSE) to be managed by an EMS, allowing EV charging while keeping the electrical service within its managed capacity.

Instead of designing for occasional peak demand, an EMS continuously monitors a building’s electrical load and intelligently manages flexible loads such as EV chargers and electric water heaters to maximize the use of the existing electrical service while maintaining NEC compliance.

Benefits of an Energy Management System

• Reduce or eliminate costly electrical service upgrades where appropriate
• Minimize utility delays associated with transformer and infrastructure upgrades
• Lower construction costs for builders and developers
• Help keep new homes more affordable
• Maximize the use of existing electrical infrastructure
• Support California’s electrification goals while remaining NEC compliant

As California continues to electrify homes and buildings, simply increasing electrical service sizes is not always the most practical or economical solution. Energy Management Systems (EMS) rather than simply installing larger electrical services offer a smarter way to make electrification more practical, affordable, and sustainable.

Intelligent load management will play a critical role in helping builders, homeowners, utilities, electrical contractors, and engineers meet the growing demand for electrification while making better use of existing electrical infrastructure.