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How to Read Your Electric Bill Before Going Solar

Published June 28, 2026 · By HelioPanels Editorial

Before you talk to any installer, spend ten minutes with your electric bill. The numbers on it determine your system size and whether solar pays off - and they stop a salesperson from sizing you wrong.

The three numbers that matter most

1. Your usage (kWh)

Look for kilowatt-hours (kWh) used this month. To size solar, you want your annual usage - add up 12 months, or multiply a typical month by 12. The US average is about 10,500 kWh/year (~865/month), but yours may differ a lot.

This drives how many panels you need.

2. Your rate ($/kWh)

Divide a charge by the kWh it covers, or look for the per-kWh price. This is the biggest factor in savings: the more you pay per kWh, the more solar saves. Roughly 15¢/kWh or higher is favorable; well below that makes solar slower to pay off. (See is solar worth it.)

3. Fixed/connection charges

Many bills have a fixed monthly charge you pay regardless of usage. Solar usually can’t eliminate this - so even a system that zeroes out your energy charges won’t take your bill to $0. Know this going in.

Other things worth spotting

  • Time-of-use (TOU) rates. Some utilities charge more during peak (often evening) hours. If you’re on TOU, a battery or west-facing panels can be more valuable.
  • Tiered rates. Some charge more per kWh above a threshold - solar can shave off your most expensive tier first.
  • Seasonal swings. Summer AC or winter heat can spike usage; size for the full year, not one month.
  • Net metering terms. How your utility credits exported solar is set by its rules - see net metering explained.

Do this before getting quotes

  1. Pull 12 months of bills (most utilities show history online).
  2. Note annual kWh, average rate, and fixed charges.
  3. Bring those numbers to every quote - they keep installers honest and let you compare offers accurately.

Bottom line

Your bill tells you your annual kWh, your rate, and your fixed charges - the three inputs that decide system size and payoff. Read it first, and you’ll get better quotes and avoid being oversold. Next: how much can you actually save with solar.

Educational information only, current as of June 2026.

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