⚡ See Your Solar Savings in 60 Seconds
Enter your monthly bill into our free calculator to see exactly how much solar could save you — including federal and state incentives.
Your electric bill hides the single most important number for going solar. Not the total dollar amount — the kilowatt-hours (kWh) you use each month. That one number tells you exactly how many panels you need.
Most people glance at the total, shake their head, and pay it. But if you're thinking about solar, your bill is basically a roadmap. It tells you:
- How much energy your home actually uses
- What you're paying per unit of energy
- Whether you're being charged extra during peak hours
- If your utility offers credits for sending power back
Let's break down exactly where to find each of these — and what they mean for your solar decision.
📑 Table of Contents
🔑 Key Takeaways
Find Your kWh Usage
Look for "kWh used" or "kilowatt-hours consumed" on your bill. This is the total energy you used that billing period.
Know Your Rate per kWh
Divide your total cost by total kWh. The national average is about $0.16/kWh — yours may be higher or lower.
Peak vs Off-Peak Matters
If you have Time-of-Use billing, you pay more during peak hours. Solar offsets the most expensive hours when panels produce power.
Look for Net Metering
Check your bill for a "net metering" or "excess generation" line item. This credit boosts your solar ROI significantly.
Where to Find Your Usage (kWh)
Every electric bill shows how much energy you used in a specific period. The unit is kWh — short for kilowatt-hours.
What Is a kWh?
Think of it like gallons of gas. A kWh is just a unit of electricity. If you run a 1,000-watt microwave for 1 hour, you've used 1 kWh. If you run it for 10 minutes, that's roughly 0.17 kWh.
Real-world examples:
- • Central AC running for 1 hour ≈ 3–5 kWh
- • LED light bulb for 10 hours ≈ 0.1 kWh
- • Electric water heater for 1 hour ≈ 4–5 kWh
- • EV charging (full charge) ≈ 60–80 kWh
Where to Find It on Your Bill
Look for one of these labels:
- "Usage (kWh)" or "Energy Consumed"
- "Total kWh"
- "Meter Reading" with a kWh label
- A graph or chart showing daily usage
It's usually near the top of your bill, right below the amount you owe. Most utility bills also include a 12-month usage history chart — this is gold for solar sizing because you can see seasonal swings.
Your Rate per kWh Explained
Knowing your total kWh is step one. Step two is figuring out what you're paying for each one.
How to Calculate Your Rate per kWh
Take your total bill amount and divide it by your total kWh. It's that simple.
// Example calculation
$150 (total bill)
÷ 1,000 kWh (total usage)
= $0.15 per kWh
In the example above, every kilowatt-hour of electricity costs 15 cents. That's pretty close to the national average.
What Does "Good" Look Like?
| State | Avg Rate per kWh (2026) |
|---|---|
| 🤠 Texas | $0.14 |
| 🌴 Florida | $0.15 |
| 🌞 California | $0.29 |
| ☀️ Arizona | $0.13 |
| 🗽 New York | $0.23 |
| 🌊 National Avg | $0.16 |
Higher rates = faster solar payback. If you're paying $0.29/kWh like in California, every kWh your panels produce saves you 29 cents. At $0.13/kWh in Arizona, the savings per kWh are lower — but Arizona gets way more sun hours, so your panels produce more total energy.
Peak vs Off-Peak Rates
Many utilities now use Time-of-Use (TOU) pricing. That means the price of electricity changes depending on what time of day you use it.
How Time-of-Use Billing Works
Off-Peak
Overnight & early morning
$0.08–$0.12/kWh
Mid-Peak
Late morning / early afternoon
$0.15–$0.22/kWh
On-Peak
Late afternoon & evening (4–9 PM)
$0.30–$0.50+/kWh
Why This Matters for Solar
Solar panels produce their most energy during midday — right when many utilities' peak rates start kicking in. If you're on TOU billing, solar can be even more valuable than a flat-rate calculation suggests, because you're offsetting the most expensive hours.
Check your bill for terms like:
- "Time-of-Use Rate"
- "TOU Pricing"
- "Peak/Off-Peak Charges"
- A chart showing hourly rates
Net Metering Credits
Net metering is one of the biggest financial benefits of going solar. Here's what to look for on your current bill.
What Is Net Metering?
When your solar panels produce more electricity than your home uses, the extra power flows back to the grid. Your utility credits you for that excess energy. Those credits offset the electricity you pull from the grid at night or on cloudy days.
What to Look For on Your Bill
Look for line items labeled:
- "Net Metering Credit"
- "Excess Generation Credit"
- "Feed-in Tariff"
- "Customer-Generator Credit"
- "Net Energy Metering (NEM)"
If your bill doesn't show a net metering line, that doesn't mean your utility doesn't offer it — it just means you don't have solar panels yet. Once you install them, that credit line will appear.
💡 Important: Net metering rules vary by state and utility. A few states have scaled back net metering or moved to less generous "buyback" rates. Always check your utility's current policy before going solar — it directly affects your payback timeline.
What Your Monthly Usage Says About Solar Sizing
Now for the part you've been waiting for — the number that tells you how many solar panels you need.
The Simple Math
Here's the rule of thumb that solar installers use:
// Solar sizing estimate
1 kW of solar panels ≈ 1,500 kWh per year
(in sunny states like AZ, CA, TX, FL)
So if your home uses 12,000 kWh per year (about 1,000 kWh/month), you'd need approximately:
// System size estimate
12,000 kWh ÷ 1,500 kWh per kW
= 8 kW system needed
An 8 kW system typically has 20–24 panels (depending on panel wattage).
Adjust for Your State
The 1,500 kWh/year per kW rule works for sunny states. If you live somewhere cloudier, the number drops:
Sunny States
AZ, CA, NV, TX, FL
~1,500 kWh/kW/year
Moderate States
NC, VA, TN, CO, UT
~1,300 kWh/kW/year
Cloudy States
WA, OR, MI, NY, MA
~1,100 kWh/kW/year
Pro tip: Add 10–20% extra capacity to account for panel degradation (panels lose about 0.5% efficiency per year) and roof shading.
🧮 Stop Guessing — Calculate Your Exact Size
Enter your usage (kWh or monthly bill) in our free solar calculator and we'll size a system for your specific roof and location.
Red Flags on Your Bill
Some fees and charges can eat into your solar savings. Watch for these before you sign a contract.
Demand Charges
Some utilities charge based on your highest single hour of usage each month, not just total kWh. Solar reduces total usage but may not eliminate the peak demand spike. Ask your installer how demand charges factor into your estimate.
Minimum Service / Connection Fees
Even with solar, you'll probably still pay a small monthly connection fee (usually $5–$20). This isn't a dealbreaker — it just means your bill will never hit $0.00. That's normal and expected.
Solar Interconnection or Buyback Fees
A few utilities charge a fee to connect solar to the grid, or they pay you less than retail rate for excess power. This can stretch your payback period by 1–3 years. Check your utility's solar interconnection policy before committing.
Recent Rate Increases
If your rate per kWh jumped recently, that's actually a sign solar is becoming more valuable. But also look at the trend — if your utility has been raising rates 5%+ per year, solar locks in a predictable energy cost for 25+ years.
Frequently Asked Questions
❓ What if I don't have a full year of electric bills?
No problem. You can still estimate. Take your last 3 months of bills, average the kWh, and multiply by 12. Keep in mind this won't capture summer AC spikes or winter heating surges. For the most accurate estimate, try to get at least 6 months or ask your utility for your 12-month history — they can provide this over the phone or through an online account.
❓ Is a higher kWh always bad for solar?
Not at all. Higher usage means you need a larger system — but it also means you'll save more money overall because you're offsetting more expensive grid electricity. A home using 2,000 kWh/month will save more per year than a home using 500 kWh/month, even after accounting for the larger system cost.
❓ Can I switch to TOU billing to save more with solar?
Many utilities let you choose your rate plan. TOU can be great for solar owners because panels produce power during the most expensive peak hours. But TOU can also be risky if you use a lot of power outside your panels' production window (like running AC at 7 PM in summer). Ask your utility about both options and compare based on your actual usage patterns.
❓ How do I know if my utility offers net metering?
Call your utility directly or check their website. You can also look up your state's policies on the Database of State Incentives for Renewables & Efficiency (DSIRE). Most states have some form of net metering or alternative buyback programs, but the exact credit rate varies widely.
❓ What if my electric bill includes gas charges too?
Combined bills are common. Look for the electricity section specifically — it will be labeled "Electric Service" or "Electric Charges." That section has the kWh usage and electric rate you need. Ignore the gas portion for solar calculations. If your bill doesn't separate them clearly, call your utility for a breakdown.