Partial Power Loss in Home

Partial power loss is one of the most underdiagnosed serious electrical problems. Unlike a complete outage (which is obviously a utility or whole-house issue), partial power loss is often dismissed as "just a tripped breaker" — but when the breakers all read ON and only some circuits work, the cause is almost always more serious.

The most dangerous cause is a broken neutral. In a standard residential 120/240V split-phase service, the neutral wire is the reference point that keeps both 120V legs balanced. When the neutral connection breaks (at the meter base, at the main panel lug, or out at the utility transformer), the two 120V phases stop being balanced. Loads on one phase can suddenly see 150V, 180V, or higher — destroying refrigerators, HVAC control boards, smart-home hubs, computers, and TVs within seconds. The other phase drops to 60V or 80V, which won't run anything but also won't immediately fail visibly.

If you suspect a broken neutral, the safe move is to shut off the main breaker immediately and call. Do not flip breakers trying to "find" the problem — every minute the imbalanced voltage runs, more devices die.

The second most common cause is a hidden breaker trip. Modern breakers can trip and sit in a position that looks identical to ON — there's only a tiny detent difference. The fix is to firmly push the breaker to the full OFF position, hear the click, then push it firmly back to ON. If it springs back to OFF, the underlying overload or fault is still present and a professional needs to diagnose.

Third is a damaged multi-wire branch circuit (MWBC). MWBCs share a neutral between two circuits to save wire. If the shared neutral breaks anywhere along the run, both circuits act erratically — sometimes one works, sometimes neither, sometimes both with reduced voltage. MWBCs in older homes (pre-2008) often lack the handle-tied breakers code now requires.

In Northern Virginia, Dominion Energy's grid is reliable, but storm damage to drop wires is common in fall and winter. If a tree limb damages just one of the three wires running from the pole to your meter, you can lose one 120V leg while keeping the other — a textbook partial outage. Dominion's outage map will sometimes flag this; sometimes it won't. When in doubt, call.