Grid-Tied Solar & Net Metering: How to Get Your Utility to Pay You

Grid-tied solar with net metering is the simplest path to dramatically lower electric bills. Learn how net metering works, which states have it, how to maximize credits, and the true ROI of a grid-tied system.

What Is Grid-Tied Solar?

A grid-tied solar system connects your home's solar panels directly to the utility grid. During the day, your solar panels power your home. Any excess electricity feeds back into the grid. At night or on cloudy days, you draw power from the grid as usual.

Key advantages over off-grid:

• No batteries needed (lower cost, less maintenance)
• Unlimited backup from the grid
• Net metering credits can offset 100% of your bill in some states
• Simpler system — fewer components

Key disadvantage: When the grid goes down, your solar system automatically shuts off (anti-islanding requirement) — unless you add a battery backup.

How Net Metering Works

Net metering is a billing arrangement where your utility measures the difference between electricity you produce and electricity you consume. If you produce more than you consume, the meter runs backward (or credits accumulate).

The mechanics vary by state and utility:

• 1:1 net metering (best): Excess kWh credited at full retail rate. Common in CA, NY, NJ, MD, OR, WA. A credit earned at 2pm on a sunny Tuesday is worth as much as a kWh consumed at 8pm.
• Avoided cost / wholesale rate: Excess kWh credited at utility's wholesale cost (typically 3–7 cents vs retail 12–28 cents). Less favorable; found in some Southern states.
• Tiered systems: First X kWh at retail, remainder at wholesale. Varies by utility.

Check your state's current net metering policy at DSIRE.USA.org — policies change frequently.

How to Size a Grid-Tied System for Maximum Credits

For 1:1 net metering, the optimal system size produces approximately 100–110% of your annual kWh consumption. Producing more means giving excess kWh to the utility at low or no value at year-end.

Calculation:

1. Find your annual kWh usage from 12 months of bills
2. Divide by (365 days × peak sun hours × 0.8 derate)
3. Result is the kW system size that covers your annual usage

Example: 10,000 kWh/year ÷ (365 × 5.0 PSH × 0.8) = 6.85 kW → install a 7 kW system

Time-of-Use Rates: The Next Challenge

Many utilities are moving toward time-of-use (TOU) pricing, where electricity costs more during peak hours (evenings) and less during off-peak hours. This changes the solar economics:

• Solar produces most during midday — often the lowest-rate period under TOU
• Your highest consumption (evenings) coincides with the highest rates
• Adding a battery lets you store midday solar and use it during evening peak hours, maximizing bill savings

If your utility has or is transitioning to TOU pricing, a hybrid solar + battery system becomes much more financially attractive than pure grid-tied solar.

Getting Your Grid-Tied System Approved

Grid-tied systems require more paperwork than off-grid because you're connecting to the utility's infrastructure:

1. Local building permit — electrical permit from your municipality
2. Utility interconnection agreement — formal application to connect to the grid. Process varies from 2 weeks to 6+ months depending on utility and state.
3. Net metering application — separate from interconnection in some states
4. Utility meter upgrade — your utility installs a bidirectional meter (usually free)

The interconnection process is often the most frustrating part of grid-tied solar. Some utilities are helpful and efficient; others are slow and obstructive. Check community solar forums for your utility's reputation before committing.