Path-Q Solar

How can solar be allocated when several units use electricity from one roof?

Answer

Solar can be allocated through a shared electrical arrangement, by assigning production or bill credits to individual meters, or by applying the system to common-area loads first. The workable method depends on the property's metering, utility program, ownership structure, and local rules.

Key points

  • A single meter serving multiple units is different from several individually metered units.
  • Allocation can be based on fixed shares, unit area, historical usage, occupancy, or another documented formula.
  • Common-area consumption may be offset before any remaining benefit is allocated to units.
  • The allocation method should define production shortfalls, excess generation, system costs, maintenance, tenant turnover, and disputes.

What it depends on

  • Number and type of utility meters
  • Whether the property has common loads
  • Utility crediting or shared-generation arrangements
  • Ownership, lease, and billing structure

Risks and trade-offs

  • A fixed allocation may not match actual unit usage.
  • Tenant turnover can make billing and credit assignment more difficult.
  • Shared or virtual allocation may be unavailable or subject to specific current rules.
  • Poorly documented allocations can create tenant, tax, accounting, or regulatory disputes.

Information you may need

  • Single-line electrical and metering diagram
  • Historical usage for each unit and common areas
  • Utility rules and available shared-solar or crediting options
  • Proposed ownership, cost-sharing, and tenant billing terms

Your next step

What to do next

Compare at least two allocation models with an installer and verify the permitted metering and crediting structure with the utility and a qualified property adviser.

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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