Path-Q Solar

How can I estimate electricity use for a new home that has no bill history?

Answer

Build a forecast from the home's size, occupancy, climate, appliances, heating and cooling systems, hot-water equipment, EV plans, and expected schedules. Treat the result as a range and update it when equipment specifications and actual bills become available.

Key points

  • Separate base household loads from major electrification loads.
  • Use equipment-specific consumption estimates where possible rather than broad averages alone.
  • Model seasonal and hourly use if system sizing or tariff value depends on timing.

What it depends on

  • Occupancy and lifestyle
  • Building envelope and climate
  • Heating, cooling, and hot-water equipment
  • Appliances and EV charging
  • Expected operating schedules

Risks and trade-offs

  • Generic averages can miss unusually efficient, inefficient, or highly electrified homes.
  • Future behavior is uncertain, especially for a new household.
  • Sizing too aggressively from an upper-bound forecast can increase cost.

Information you may need

  • Floor area, insulation, and climate
  • Equipment and appliance specifications
  • Expected occupants and schedules
  • EV and future electrification plans
  • Any builder energy model or similar assessment

Your next step

What to do next

Create low, expected, and high annual-load scenarios and provide the equipment list to the installer for a production and sizing comparison.

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