Common-Area Load: The Simplest Place to Start With Rooftop Solar

The overlooked line item

Every multifamily property and HOA pays a common-area electric bill: corridor lighting, elevators, pumps, laundry, gates, cameras, irrigation controllers, and increasingly EV chargers. On a larger property that bill is a significant, owner-paid operating expense.

Why it's the easiest starting point

• One meter, one account. No resident onboarding, no billing platform, no collections.
• Daytime load. Corridor lighting, pumps, and elevators run when the sun is up, so almost every kilowatt-hour is consumed on-site at full retail value rather than exported at a lower rate.
• No lease changes. You are reducing an operating expense you already control.

What it's worth

An array sized to common-area load can offset a large share of that bill; how much depends on the load shape, the roof and the state's export rules, so it is modeled per property. Whatever the saving is, expense reduction flows to NOI exactly like revenue does.

When to expand to resident billing

Once the common-area system is producing and metered, adding resident-facing capacity is an incremental step rather than a new project: same interconnection, same monitoring, same relationships. Most owners layer it in at month 6–12.

Practical first move

Pull twelve months of common-area statements and the roof plan. Those two documents are enough to size a first phase and put a number on it.

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