A recent investigation by The Washington Post found that homeowners are sometimes advised to replace their panels because outdated electrical codes haven’t kept pace with improvements in energy efficiency. The National Electrical Code, which sets safety standards for electrical installations, allows electricians to estimate a home’s power needs using either appliance ratings or actual electricity consumption.
Electricians often rely on appliance ratings, which can exaggerate demand because household devices rarely run at full power at the same time. As a result, homeowners installing induction stoves, heat pumps or electric-vehicle chargers may be advised to replace panels that still have room for additional appliances.
The Post pointed to a 2026 study by researchers at Lawrence Berkeley National Laboratory that found 98% of homes analyzed had peak electricity demand below the capacity of a standard 100-amp panel. Despite those findings, contractors frequently recommend replacing 100-amp panels, particularly in older homes.
Another study by Lawrence Berkeley researchers found that using actual electricity consumption instead of appliance ratings reduced estimated power needs by 40% for a median single-family home.
The more common calculation method in the electrical code “ends up being wildly conservative and just wrong a lot of the time, because previously we didn’t have the data,” Greg Pfotenhauer, a consultant at Artemisia Energy, told the Post.
When do you actually need a new electrical panel?
Although the National Electrical Code has been revised to account for more energy-efficient appliances, many states still operate under older versions. But outdated codes aren’t the only consideration when deciding whether to replace an electrical panel.
The Electrical Safety Foundation International, a Virginia-based nonprofit, recommends electrical inspections for homes that are 40 years or older, have undergone major renovations or have had major appliances installed.
It identifies frequently tripped breakers, flickering lights, unusual buzzing sounds and signs of overheating as potential electrical hazards. However, these warnings alone don’t necessarily mean the entire panel needs to be replaced.
A guide developed by the New Buildings Institute, with support from the U.S. Department of Energy, identifies two other reasons an upgrade may be necessary: insufficient electrical capacity to power additional appliances or a lack of space for new circuit breakers.
These problems aren’t necessarily the same. A panel may have enough electrical capacity but lacks room for additional breakers. In that case, homeowners may need more breaker space without increasing their home’s electrical capacity.
