Residential Storage
Home battery energy storage — Powerwall, Enphase, FranklinWH.
2,219 permits classified across 3 metros
Browse residential storage permits in Phoenix →What it covers
Residential battery-storage permits cover behind-the-meter BESS (battery energy storage system) installs on residential-occupancy buildings — Tesla Powerwall, Enphase IQ Battery, FranklinWH, and similar home battery systems, whether paired with rooftop solar or installed standalone for backup and time-of-use arbitrage. The fastest-growing residential-electrical wedge in solar-mature Western metros (Mesa, San Jose, Tucson, Tempe lead early coverage) as storage attach-rates climb on resilience + utility-rate economics. Split out of Residential MEP + Residential Solar on classifier reclassification; segments are overlap-free, so a permit reclassified here is decremented from its prior segment at the source metro on the same regen.
How a permit lands in Residential Storage.
Every silver permit flows through a two-stage classifier. The deterministic stage maps the structured signals — work_class, the normalized permit type, and the building sub-type — into the segment vocabulary where the mapping is unambiguous. The machine-learning stage handles the cases that aren't direct lookups: multi-vocab permit-type strings, ambiguous occupancy spans, and jurisdictions that bundle categories. The segment is the classifier's output, the same axis across every metro — so storage_residential means the same thing in NYC as in LA even though the upstream jurisdictions emit completely different raw permit-type strings.
When the signal genuinely isn't there, we say so. A row with no assignable segment degrades honestly — to its work-nature, then to its raw source type, and only to “Unclassified” when truly nothing is known. We never guess a segment to fill a gap; an honest Unclassified is the floor, and field-level data-quality flags surface when the classifier had low confidence. That restraint is the point — the classification is only worth selling on if the “don't know” is honest.
Residential Storage by metro — where it’s moving
Where residential storage permits are classified today, ranked by volume — with each metro’s momentum (the last 90 days vs the prior 90) so you can see where the segment is heating up in your territory. Momentum shows only where we have enough filings to stand behind it. Metros with recent activity link straight into the live browse.
+60% vs prior 90d
- Phoenix →-23%1,559
- San Jose →+60%398
- Tucson →-61%262
Who tracks Residential Storage.
Residential Storage is a sales-intelligence segment for battery-storage (BESS) manufacturers and installers tracking residential storage adoption. Filter it by metro, rank the contractors pulling these permits, and see the projects worth selling into — the same way across every covered market.