Claire WhitakerBy Claire Whitaker

Updated November 2026

A comed net metering bill example shows how a home with rooftop solar gets billed when it both draws power from the grid and sends excess power back to it. For most Illinois homeowners, the comparison that matters is between reading a standard ComEd bill with net metering credits and comparing the two main ways your exported energy can be valued. Net metering credits your bill one-for-one for excess kWh, while a time-varying or net billing structure values exports at different rates depending on when you produce them. This article walks through both, using a worked example, so you can judge which setup fits your household.

Before comparing, note that Illinois rules and utility tariffs change. Confirm current terms with ComEd or a licensed installer before making decisions based on this guide.

Bottom Line: Which Option Wins for Which Reader?

Net metering with a one-to-one kWh credit tends to suit homeowners who use roughly as much electricity over a year as their panels produce, because monthly surpluses carry forward and offset later usage. Households that run most of their load during evening hours, or that expect to export heavily at midday, may find a time-differentiated valuation less favorable and should model both before signing. The rest of this article shows the arithmetic.

Side-by-Side Comparison

Criterion Option A: Traditional Net Metering (kWh credit) Option B: Time-Varying Export Valuation
How exports are valued Each exported kWh offsets one imported kWh Each exported kWh is credited at a rate tied to time of day
Monthly surplus handling Carries forward as kWh credits Credited at the applicable export rate in the billing period
Predictability of credits High; credits track your own production and use Moderate; depends on the rate schedule in effect
Best fit for evening-heavy use Good, since banked credits cover night usage Weaker, because evening imports face higher rates
Ease of reading the bill Straightforward kWh line items More line items and rate tiers to track
Bill-shock risk in low-solar months Lower when banked credits exist Higher if export value is low in winter

Worked Example: Reading a ComEd Net Metering Bill Line by Line

Suppose a household uses 900 kWh in a summer month and its array produces 1,100 kWh. The bill is built from three numbers: energy imported from the grid, energy exported to it, and the net of the two.

  1. Imported energy: 300 kWh drawn from the grid during the month when panels could not cover load, such as evenings.
  2. Exported energy: 500 kWh sent to the grid at midday, after household use was met.
  3. Net position: 500 kWh of exports minus 300 kWh of imports leaves a 200 kWh credit.

Under traditional net metering, the 200 kWh credit carries forward and offsets future imports. In a shoulder-season month with lower production, that credit can absorb a shortfall before any energy charge appears. Under a time-varying valuation, the 500 kWh export is priced by hour, so the midday credits may be worth less or more than the evening imports they are compared against, which changes the bottom line even though the kWh totals are identical.

When you read your own statement, look for the delivery charges, supply charges, and any credit carryforward line separately. The total due is the sum of these, minus credits. A useful habit is to write down the kWh imported, kWh exported, and carryforward balance each month for a full year. Patterns that emerge, like a winter deficit or a summer surplus, tell you more than any single bill.

Criterion 1: Credit Accuracy and Transparency

Winner: Traditional net metering. Because each exported kWh is matched one-for-one against imports, the credit is easy to verify by hand. You need only your meter readings and the carryforward balance. Time-varying structures require you to know the rate schedule for each hour, which adds a verification step many homeowners skip.

Criterion 2: Handling Seasonal Surpluses and Shortfalls

Winner: Traditional net metering. Banked kWh credits smooth out seasonal swings. A large spring surplus can cover a winter shortfall, though carryforward rules and any annual true-up terms determine how much survives. Time-varying valuation settles more of the balance each period, which can help when you want to avoid carrying credits but leaves you more exposed when winter exports are worth less.

Criterion 3: Fit for Evening-Heavy Households

Winner: Traditional net metering. Households that cook, run HVAC, and charge electric vehicles after sunset draw most of their energy when panels are idle. Banked credits from daytime exports effectively shift midday energy to the evening. A time-varying structure weakens this effect because the value of midday exports may not match the cost of evening imports.

Criterion 4: Ease of Understanding Your Bill

Winner: Traditional net metering. Fewer line items mean fewer places for errors to hide. Owners often report that reconciling a time-varying statement takes noticeably longer, especially in the first few billing cycles after interconnection.

Criterion 5: Exposure to Rate Changes

Winner: Depends on your risk tolerance. A one-for-one kWh credit is fixed by the structure of the program, while the value of time-varying exports moves with the rate schedule. If you expect rates to rise, a time-varying structure may be more favorable for midday exporters. If you prefer stability, the kWh credit is steadier. For background on how these rules have shifted, see Net Metering News Today: What Changed and How It Affects Your Solar Bill.

Criterion 6: Troubleshooting High Bills

Winner: Traditional net metering, because the variables are fewer. When a bill looks too high, the usual culprits are a missing carryforward, a meter read error, or a rate change. A kWh-based statement makes each of these easier to isolate. If your bill still seems wrong after checking the basics, Why Is My Net Metering Electricity Bill Still High? 6 Causes and Fixes walks through the most common causes.

For a general primer on how credits are applied in the first place, Solar PV Net Metering Explained: How It Works and Credits Your Bill covers the mechanics without the ComEd-specific detail.

Which Should You Choose?

Choosing between these structures depends less on preference and more on how your household uses energy across the day and the year. Use this checklist:

  • Choose traditional net metering if your annual production roughly matches your annual use and you want simple, verifiable credits.
  • Choose traditional net metering if your household draws heavily after sunset and needs daytime exports banked for evening use.
  • Choose a time-varying structure if you run midday loads, such as a home office or a pool pump, and can shift usage toward peak export hours.
  • Choose a time-varying structure if you are comfortable reading detailed statements and tracking rate schedules.
  • Model both before you commit by using twelve months of your own interval data, if available, and comparing the resulting bills.
  • Consult a licensed solar installer or energy consultant before signing an interconnection agreement, since contract terms affect long-term results.

Products to Help You Track Your Bill

Several devices help homeowners see where energy is going, which makes comparing billing structures much easier. Each of these is a monitoring or metering product rather than a replacement for your utility meter.

View on Amazon — a whole-home monitor that tracks consumption and production in near real time, useful for matching your own usage to the hours your panels export.

View on Amazon — a circuit-level monitor that breaks usage down by appliance, helpful for finding evening loads that drive imports.

View on Amazon — a three-phase energy meter suited to tracking import and export on a per-circuit basis for owners who want granular data.

Check that any device you choose is compatible with your electrical panel and supports the metering you need. A licensed electrician should handle any hardwired installation.

FAQ

What does a typical comed net metering bill example include?

It usually shows imported kWh, exported kWh, any carryforward credit, delivery and supply charges, and the net amount due. Reviewing each separately makes it easier to see where credits are applied.

Do unused credits expire?

Carryforward and annual true-up rules determine what happens to unused credits. Check your current tariff or ask ComEd directly, because these terms can change.

Why does my bill show a charge even though my panels produce more than I use?

Most bills include fixed delivery or customer charges that apply regardless of net usage. Credits offset the energy portion, not always the fixed fees, so a small balance can remain.

Can I switch between billing structures?

Eligibility to change depends on program rules and your interconnection agreement. Contact ComEd to learn whether a switch is allowed and what the timing requirements are.

Should I hire someone to review my bill?

If your statements are confusing or the credits look wrong, a licensed solar installer or independent energy auditor can review the numbers. This is a sensible step before making long-term decisions about system size or billing structure.

Conclusion

A comed net metering bill example makes one point clear: the kWh totals on your statement tell only part of the story, and the valuation rules determine how much those kWh are worth. For most homes with balanced annual production and evening-weighted use, traditional kWh-based net metering is easier to verify and tends to smooth seasonal swings. Homes with strong midday loads and a willingness to track rate schedules may find a time-varying structure worth modeling. Pull twelve months of your own data, run both scenarios, and confirm the current rules with ComEd or a licensed installer before you commit.

Claire Whitaker

About Claire Whitaker

Claire Whitaker is part of our editorial team and reviews and edits our home solar guides, checking product details against manufacturer specifications and owner feedback.