You spent twenty thousand dollars on solar panels expecting a near-zero electric bill. Instead you opened this month’s statement and it is $80. Or $120. Or higher than before you installed solar. Something is wrong, or the solar company lied to you, or both.
In most cases, the bill is correct and there is an explanation that makes sense once you understand how solar billing works. In some cases, something is actually wrong with the system. Here is how to tell which situation you are in and what to do about it.
The Connection Fee: You Still Pay It
Every utility charges a fixed monthly fee for being connected to the grid, regardless of how much electricity you use or generate. This fee is usually called a customer charge, a service charge, or a meter fee. It is typically $10 to $25 per month. Your solar panels offset the electricity usage charges on your bill. They do not offset the connection fee.
If your bill was $150 before solar and is now $15, and $12 of that $15 is the connection fee, your solar is working exactly as designed. You are paying the minimum possible bill. The connection fee is the floor. You cannot go below it unless your utility offers a different rate structure that waives it, which most do not.
Some utilities also charge a minimum bill amount that is higher than the connection fee alone. If your utility has a $25 minimum monthly charge and your net electricity usage after solar credits is $5, you pay $25, not $5. Check your utility’s rate schedule to understand the minimum.
Seasonal Variation: Winter Bills Are Higher
Solar panels produce the most electricity in summer when the days are long and the sun is high. They produce the least in winter when the days are short and the sun is low. Your electricity usage typically peaks in summer from air conditioning and in winter from heating if you have electric heat. The mismatch between production and usage creates seasonal bill variation.
Under annual net metering, your summer surplus credits cover your winter deficit. You may have zero or near-zero bills in April through September and bills of $50 to $100 in November through February. The annual total is what matters, not any individual month. If your annual bill is close to the connection fee times 12 months, the system is performing as expected.
If your installer showed you a monthly savings estimate that showed zero bills every month of the year, that estimate was misleading. Solar production is seasonal. Monthly variation is normal and was baked into the annual production estimate the installer used to size your system. Go back to the original proposal and look for the annual production estimate, not the monthly savings graphic.
You Are Using More Electricity Than Before
This is the most common reason for unexpectedly high bills after solar, and it is the one nobody wants to hear. You installed solar and started using more electricity because you thought it was free. You set the air conditioner two degrees cooler. You bought an electric vehicle. You added a hot tub. You run the pool pump longer. You stopped caring about turning off lights.
Solar panels offset a fixed amount of electricity, not an unlimited amount. If your system was sized to cover 10,000 kilowatt-hours per year and you now use 13,000, the extra 3,000 appears on your bill at the full retail rate. The panels are producing what they were designed to produce. Your usage increased beyond the design assumption.
Compare your monthly kilowatt-hour usage from before solar to after solar. Look at the actual consumption numbers on your bill, not the dollar amounts. If your usage is higher, the panels are not underperforming. You are using more power. The solution is either to reduce usage or to add panels to cover the new load.
The System Is Underperforming
Sometimes the bill is high because the panels are not producing what they should. Here is how to check.
Log into your monitoring portal. Every solar system installed in the last decade has online monitoring that shows daily, monthly, and lifetime production. Compare this month’s production to the same month last year. A drop of more than 10 percent that persists across multiple months indicates a problem.
Common causes of underperformance include dirt and debris on the panels, particularly pollen in spring and dust in dry months. A new shade source that did not exist when the system was installed, such as a tree that has grown taller or a new building next door. An inverter that has failed or partially failed. String inverters can lose individual strings without tripping a fault that the monitoring system flags. A panel that has failed or is heavily shaded while the rest of the array is producing normally. Module-level monitoring from microinverters or DC optimizers identifies this. String inverter systems without per-panel monitoring cannot.
If your monitoring shows production significantly below the installer’s estimate for multiple months and you have ruled out dirt and new shade, call the installer for a service visit. The system may have a failed component that is covered under warranty.
Your Net Metering Is Not What You Thought
Not all net metering is full retail rate. Some utilities credit excess generation at the avoided cost rate, which is the wholesale price of electricity, typically 2 to 4 cents per kilowatt-hour compared to the retail rate of 12 to 18 cents. Under this structure, a kilowatt-hour you export during the day is worth much less than a kilowatt-hour you consume at night.
If your utility uses avoided cost crediting rather than full retail net metering, your bill will be higher than you expected based on the installer’s projection, especially if the installer assumed full retail net metering in their savings estimate. Check your utility’s net metering policy. The rate at which exports are credited is listed in the interconnection agreement you signed with the utility. If the credit rate is lower than the retail rate, your solar savings are lower, and your bill is higher, than a full retail net metering projection would suggest.
Time-of-Use Rates: You Pay More When Solar Is Not Producing
If your utility has moved you to a time-of-use rate as a condition of interconnecting your solar system, you pay different prices for electricity at different times of day. Peak rates, typically 4 p.m. to 9 p.m. on weekdays, are two to three times the off-peak rate.
Solar panels produce maximum power between 10 a.m. and 4 p.m., which is typically the off-peak or mid-peak period with lower rates. Your panels generate credits at the lower off-peak rate. Your evening consumption, when the family is home using appliances, lighting, and air conditioning, is charged at the higher peak rate. You may be generating enough kilowatt-hours to offset your usage but losing money on the price difference between when you generate and when you consume.
The solution is to shift usage to the solar production hours. Run the dishwasher, washing machine, and pool pump during the day when the panels are producing. Charge an electric vehicle during the day. Pre-cool the house with air conditioning in the afternoon before peak rates begin, then let the temperature drift up slightly during the peak window. A battery solves this problem by storing daytime solar for evening use. Without a battery, behavior change is the only tool.
The Diagnostic Checklist
Start with the monitoring portal. Is the system producing the expected kilowatt-hours for this month compared to the same month last year? If yes, the bill issue is on the consumption or billing side, not the production side.
Compare your current usage to your pre-solar usage. Are you using more electricity? If yes, the panels are not underperforming. You increased your load.
Check your utility rate structure. Are you on a time-of-use rate? Is net metering at full retail or avoided cost? Are there minimum bill charges above the connection fee?
Add up your annual bill, not just this month. Is the annual total close to what the installer projected? If yes, this month’s bill is seasonal variation, not a system problem.
If the monitoring shows a production drop, the usage has not increased, the rate structure is what you expected, and the annual bill is still high, call your installer. Something is wrong with the equipment.
Frequently Asked Questions
Should my bill be zero after installing solar?
Almost never. Even a system sized to produce 100 percent of your annual usage will have bills above zero in months when production is lower than usage, typically winter months. You will also pay the fixed connection fee every month regardless of production. A zero-dollar bill every month of the year requires a system that is oversized for your annual usage, located in a climate with minimal seasonal variation, or paired with a battery to time-shift production. These conditions are rare. Expect bills that vary by season and total near the connection fee over the course of a year.
How do I know if my solar panels are even working?
Check the monitoring portal on your phone or computer. Every modern solar system reports production data in real time or daily. If the portal shows production, the system is working. If it shows zero production, check whether the inverter has power. Look for a green light on the inverter. A red or no light means the inverter is off or faulted. Check the breaker in your main electrical panel labeled solar or PV. If it is tripped, reset it once. If it trips again, call your installer. Do not reset a breaker more than once without diagnosing the cause.
