Ethan BrooksBy Ethan Brooks

Updated November 2026

iid solar net metering is the billing arrangement that lets Imperial Irrigation District customers with rooftop solar receive credit for the electricity they send back to the grid. In this guide, you will learn how the program is structured, how your monthly credits are calculated, what documents and equipment you need before you apply, and how to check that your bill reflects what your system actually produces. The steps below apply to the general process, but always confirm current rules with the utility before you sign a contract or energize a system.

What iid Solar Net Metering Means for Your Bill

Net metering works by measuring electricity in two directions at your service connection. When your panels produce more power than your home uses, the excess flows onto the grid and the utility’s meter runs backward. When your home draws more than your panels produce, such as at night, you pull power from the grid as usual. The utility nets these flows over a billing period and charges you only for the difference.

Shopping for one? See our guide: Net Metering in Virginia vs Virginia Community Solar: Which Should You Choose?.

Two details matter most for homeowners. First, the value of exported energy is usually set by a rate schedule that may differ from the rate you pay for imported energy. Second, unused credits may carry forward to later months, but the rules for year-end balances, rollover and cash-out vary by utility and by rate plan. Read your interconnection agreement carefully on both points.

Step 1: Confirm Your Eligibility and System Size

Before you design anything, confirm that your property is in the utility’s service territory and that your planned system fits the program’s limits. Most net metering programs set a maximum system size tied to your historical peak demand or annual usage. A system that is too large for your load may be placed on a different tariff or may require a study before approval.

Pull the last 12 months of bills and total your kilowatt-hour usage. Divide by 12 for a monthly average, then use a local solar production estimate for your roof orientation and tilt to see how much of that load a system can offset. Many installers and online calculators use typical production factors in kilowatt-hours per kilowatt of installed capacity per year. Treat these as estimates, not guarantees.

Step 2: Gather the Documents You Will Need

Utilities require a standard set of paperwork. Having it ready speeds up review and avoids back-and-forth that can delay your system by weeks.

  • Proof of ownership or landlord authorization for the property
  • Recent electric bills and your account number
  • A single-line electrical diagram showing panels, inverter, disconnects and the meter
  • Equipment specification sheets for panels and inverters, including certification listings
  • A site plan showing the array location and setbacks
  • The signed interconnection application and any required agreement forms
  • A licensed installer’s contact information and license number, if you hire one

Step 3: Understand How Credits Are Calculated

Your bill is built from a few variables. The table below shows how they typically interact. Your utility’s rate schedule defines the exact terms.

Variable What it means Why it matters
Imported kWh Energy drawn from the grid Billed at your normal retail or time-of-use rate
Exported kWh Energy sent to the grid Credited at the applicable export rate or netted against usage
Billing period The window over which flows are netted Short-term surpluses in one period may offset deficits in another
Fixed charges Monthly service and meter fees Usually still owed even with a zero net energy bill
Year-end balance Leftover credits at the end of the cycle May roll over, be paid out at a set rate, or expire

Many homeowners are surprised to find that exported solar is valued differently from the electricity they consume. If your utility uses a time-of-use structure, production during high-price evening hours is worth more than production at midday. Ask the utility for a sample calculation using your own load profile before you finalize system size.

Checking Your Bill Each Month

Compare three numbers every billing cycle: total kWh imported, total kWh exported, and the net charge or credit. Then compare exported kWh against your system’s inverter production report for the same dates. If the figures differ by more than a few percent, contact the utility and ask for a meter read verification. Keep copies of these bills with your system records.

Step 4: Prepare for Interconnection and Inspection

Once the application is approved, your installer will schedule a permit inspection with the local building department and, in most cases, a utility inspection or witness test. Expect the utility to require a disconnect switch accessible to its crews, correct labeling, and inverter settings that meet anti-islanding requirements. Do not energize the system until the utility gives written permission to operate.

  1. Submit the completed application and diagrams.
  2. Wait for utility review and approval to install.
  3. Install the system under permit.
  4. Pass the building inspection.
  5. Complete the utility witness test or inspection.
  6. Receive permission to operate and activate the new meter or billing arrangement.

Common Mistakes to Avoid

  • Sizing for the future without a plan. Oversizing can push you into a rate class or review that you did not plan for. Model your current load first.
  • Assuming the export rate equals the retail rate. Confirm the export valuation in writing.
  • Ignoring fixed charges. A near-zero energy balance can still leave a monthly bill.
  • Energizing before approval. Running the system without permission can violate your agreement and delay your credits.
  • Forgetting to update the utility after changes. Adding batteries, panels or EV chargers may require a new review.

Tips for Getting the Most From Your System

  • Shift large loads such as laundry, dishwashing and EV charging to midday when production is high.
  • Track monthly production against expectations for the first year to catch wiring or shading problems early.
  • Keep the utility’s rate schedule on file and review it when it changes.

A few inexpensive tools make monitoring and verifying your credits much easier. Look for devices that report real-time import and export so you can compare against your bill.

  • Sense Home Energy Monitor: A whole-home monitor that tracks solar production and grid flow, helping you see when you are exporting. View on Amazon
  • Emporia Vue 3 Energy Monitor: Circuit-level monitoring that shows when high-use appliances run during export hours. View on Amazon
  • Fluke 376 FC True-RMS Clamp Meter: A clamp meter with wireless capability for checking current on solar circuits during commissioning or troubleshooting. Work on live systems should be done by a qualified electrician. View on Amazon

FAQ

Does iid solar net metering pay me cash for extra power?

Not always. Unused credits may roll forward, and year-end treatment depends on the specific rate plan. Check your interconnection agreement for the exact terms.

How long does the approval process take?

Timelines vary with utility workload, permit backlogs and whether a study is required. Plan for several weeks to a few months from application to permission to operate.

Can I add batteries to a net metered system?

Often yes, but the utility may need to review the change. Batteries can alter export patterns and may fall under different interconnection rules.

Will my bill drop to zero?

Only if your annual production matches or exceeds your usage and the bill has no fixed charges. Most homeowners still pay some monthly fees.

What happens if I move?

Net metering generally stays with the property. Confirm transfer procedures with the utility before listing or closing on a home with solar.

Do I need a licensed installer?

Many jurisdictions require licensed electrical work for grid-tied systems. Check local requirements and consult a licensed professional for design and installation.

How often should I check my system?

Review production monthly and inspect panels and mounts at least once a year for debris, loose hardware and wiring damage.

Conclusion

iid solar net metering rewards homeowners who understand how their exports are valued and how their bills are structured. Confirm eligibility, gather the paperwork, and get written terms for export credits before you build. Verify your bill against production data every month, and consult a licensed professional for design, permitting and any electrical work.

Ready to choose one?

Ethan Brooks

About Ethan Brooks

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