Can I sell excess solar energy back to the grid?

How Selling Solar Energy Back to the Grid Works

If you have rooftop solar panels, your system may produce more electricity than your home uses during sunny hours. In many areas, you can export that excess power to the utility grid and receive a credit or payment. This process is typically called net metering or a net billing tariff.

Under net metering, your meter runs backwards when you send power out, effectively storing your surplus as a credit against future consumption. Under net billing (also called feed-in tariffs), you sell your excess at a set wholesale or retail rate, often lower than what you pay to buy power. The specific rules, rates, and caps vary by state and by utility. Always check your local utility’s interconnection policy or your state public utility commission’s website for current terms.

What Affects Whether You Can Sell Power

1. Utility policy and net metering caps

Most states require investor-owned utilities to offer net metering, but many have capacity limits. Once a certain percentage of the utility’s peak load is met by solar, the incentive may switch to a less favorable net billing tariff. Some utilities also cap the system size (e.g., 10 kW for residential).

2. System size and array orientation

Your system must be sized to match your typical annual usage. If it’s too large, you may not be eligible for credits on the extra output. Proper orientation and tilt maximize your surplus during peak sun hours, which matters if your utility pays different rates at different times of day.

3. Metering and interconnection equipment

You’ll need a bidirectional meter (often installed free by the utility) and your inverter must meet utility-grade safety and power quality standards. Your installer should handle interconnection paperwork, including a signed agreement and sometimes an inspection.

4. Time-of-use rates and net billing

If your utility uses time-of-use (TOU) pricing, you might get higher credits for power exported during peak hours (late afternoon in summer) and lower credits at off-peak times. A system that generates more during peak times can be more valuable.

Steps to Get Started Selling Excess Solar

1. Review your utility’s net metering or net billing tariff on their website or call their customer service for the solar department.
2. Get a professional solar assessment from a licensed, insured contractor who specializes in grid-tied residential systems. They will model your annual usage, panel output, and financial payback.
3. Apply for interconnection before installation. Your installer or you will submit an application, system design, and single-line diagram to the utility.
4. Install the system and pass the utility inspection (if required). The utility will swap your meter and enable net metering.
5. Monitor your production and credits through your inverter’s app or the utility’s online portal.

When to Call a Pro vs. DIY

• DO call a licensed electrician or solar contractor for the interconnection application, design, installation, and permits. Most utilities require a licensed professional to sign off.
• DO NOT attempt to wire solar panels into your main panel yourself unless you are a licensed electrician. Incorrect wiring can create fire hazards, shock risks, or grid-safety issues.
• DIY solar kits that plug into an outlet are generally not eligible for net metering and may violate local codes. If you want to sell power back, you need a fully permitted, grid-tied system installed by a qualified pro.

Key Takeaways

• Selling excess solar back to the grid is possible in most areas, but the financial benefit depends on your utility’s net metering or net billing rates and any capacity caps.
• Work with a licensed solar contractor to ensure proper interconnection, code compliance, and safety.
• Monitor your system’s production and your utility’s rate changes annually to maximize savings.
• Local codes, utility policies, and state solar incentives vary widely. This article provides general guidance, not site-specific advice. Always verify with your utility and a licensed professional before making decisions about a solar installation.