Claire WhitakerBy Claire Whitaker

Updated November 2026

Rocky Mountain Power net metering rates determine how much your home solar system earns for the electricity it sends back to the grid. In this guide you will learn how the credit is calculated, which factors move your payout up or down, and how to estimate what your own array will return before you commit to a size. Rate structures change, so always confirm current terms with the utility before making decisions.

How Net Metering Works With Rocky Mountain Power

Under net metering, your solar array feeds electricity into your home first. Anything you do not use flows out to the grid, and the meter tracks that flow in both directions. At the end of each billing period, the utility compares what you exported with what you imported and bills you for the difference. If you exported more than you imported, the surplus becomes a credit that carries forward, usually to offset future usage.

Shopping for one? See our guide: Rocky Mountain Power Net Metering (2026): Which Is Better for Your Home?.

The practical effect is that your rate for exported energy matters as much as the rate you pay for power you draw. A system that produces a lot of midday electricity but leaves your home during the day will export heavily, so the credit terms carry real weight in your savings math.

Step 1: Find Your Current Rate Schedule

Start with the tariff that applies to your service address. Utilities publish residential and small-commercial rate schedules, and the schedule you are on determines how energy and any fixed charges are billed. Look for the section covering customer-generator or net metering provisions, since those terms define how exports are valued.

Write down these items from the schedule:

  • The per-kilowatt-hour rate for energy you consume
  • Any separate charge for exported energy or the rate used to credit it
  • Fixed monthly or daily service charges
  • Whether any demand or time-of-use components apply to your account
  • Rules for how excess credits roll over, and whether they ever expire or are paid out

Step 2: Understand How Exports Are Valued

The credit for exported energy is where many homeowners get confused. Some arrangements credit exports at a rate close to the retail price, which makes the economics of a solar system fairly straightforward. Others use a lower export or avoided-cost rate, which shifts more value toward self-consumption. Check whether your tariff credits exports at the same per-kilowatt-hour figure you pay for imports, or at a different number.

Because exports and imports can be valued differently, the timing of your usage matters. A home that runs air conditioning or heating in the afternoon and evening will consume more of its own production, while a home empty during the day will rely more on exports.

Step 3: Estimate Your Annual Production

To predict your credit, you first need a realistic production number. A common method is to multiply system size in kilowatts by the expected yearly sun hours for your location, then adjust for system losses, orientation and shading. Many installers and free online calculators do this, and the National Renewable Energy Laboratory publishes resource data you can use to sanity-check results.

A simple worked example: a 6 kW array in a sunny area with an effective annual yield of about 1,500 kWh per installed kilowatt produces roughly 9,000 kWh per year before shading or inverter losses. Shade, tilt and roof direction can push that figure noticeably up or down.

Step 4: Compare Production With Your Usage

Pull twelve months of your bills and total your annual consumption. Then compare that figure with estimated production. Three outcomes are common:

Scenario What happens on the bill What to watch
Production below usage You still import power, and exports offset part of it Confirm the export rate applies to all exports
Production roughly equal to usage Credits often net close to zero over the year Seasonal swings can leave surplus in summer and a deficit in winter
Production well above usage Large credit balances may build up Check rollover limits and whether surplus is paid out

Seasonal patterns matter. A system may overproduce in spring and early summer, then draw more from the grid in winter. Netting across the full year is often more favorable than netting each month, but confirm this with the utility.

Step 5: Calculate Your Estimated Credit

Use this simple structure to estimate annual value:

  1. Estimate annual kWh exported (production minus self-consumed energy).
  2. Multiply exports by the export credit rate from your tariff.
  3. Estimate avoided grid purchases, meaning kWh you consume directly from solar, multiplied by the energy rate.
  4. Subtract any fixed charges that remain on the bill.

Keep your estimate conservative. Real production varies with weather, and rate schedules can be revised. Running the numbers with two or three production scenarios gives you a range rather than a single hopeful figure.

Factors That Change Your Net Metering Value

Self-Consumption

Every kilowatt-hour you use while the panels are producing is one you do not buy and do not need to export. Shifting heavy loads such as laundry, dishwashers or pool pumps into daylight hours can raise the value of your system.

System Orientation and Tilt

South-facing arrays in the Northern Hemisphere generally produce the most annual energy. East or west faces shift production earlier or later in the day, which can help or hurt depending on when you use power.

Shading

Even partial shade on a single module can reduce output across a string if the system lacks module-level optimization. Trim trees and check for new obstructions each season.

Rate Changes

Utilities can file rate case changes that affect export credits or fixed charges. Keep copies of your tariff at the time you install, so you can measure changes later. For broader context on how credits work under different structures, see What Is the Benefit of Net Metering for Home Solar Owners? and Why Is My Net Metering Electricity Bill Still High? 6 Causes and Fixes.

Common Mistakes

  • Using the retail rate for everything. Exports may be credited at a different rate, which can reduce expected savings significantly.
  • Ignoring fixed charges. Service charges continue regardless of production, so they reduce net benefit.
  • Sizing for maximum production. Oversizing can create credit balances you cannot use if rollover is limited.
  • Forgetting seasonal swings. A good annual total can hide winter months where you import heavily.
  • Assuming the rate is fixed for life. Tariffs can change, so recheck your numbers periodically.

Tips for Maximizing Your Credit

  • Schedule high-draw appliances for midday when panels are producing.
  • Review monthly bills for the first year to confirm credits post as you expect.
  • Ask the utility in writing how excess credits are handled at the end of the year.
  • Keep a log of production from your inverter or monitoring app to compare against bills.
  • Consult a licensed installer or energy advisor before making financial commitments based on these estimates.

A few accessories make it easier to track whether your credits match the numbers on your tariff. A whole-home energy monitor shows real-time import and export so you can see how your household uses solar during the day. View on Amazon

A clamp-on power meter lets you measure individual appliances, which helps you decide which loads to shift into daylight hours. View on Amazon

Ask your installer whether your inverter supports a monitoring app. Such apps record daily production, which you can compare against each bill. View on Amazon

FAQ

Does Rocky Mountain Power pay cash for excess solar?

Whether surplus credits are paid out or only rolled forward depends on the tariff and on your account terms. Confirm the current treatment in writing with the utility.

Do credits roll over from month to month?

Many net metering arrangements carry excess kWh forward, sometimes netting over a full year. The exact period and any limits should appear in the tariff.

Will my fixed monthly charge still apply?

In most cases yes. Service charges generally continue even when production covers your usage.

Can I change my rate schedule after installing solar?

Some customers can request a different schedule, but eligibility and timing rules vary. Ask before switching, since the change may affect your credits.

How do I know my system is exporting correctly?

Compare your inverter’s production data with the export figures on your bill. Large mismatches are worth raising with the utility and your installer.

Does the export rate change over time?

It can, because tariffs are revised through regulatory proceedings. Keep records of the rate in effect when you interconnected.

Should I size my system to cover all my usage?

Matching annual production to usage is a common goal, but the best size depends on your export credit, rollover rules and budget. Discuss scenarios with an installer or energy consultant.

Conclusion

Rocky Mountain Power net metering rates come down to three questions: how exports are valued, how credits carry forward, and how much of your solar output you use directly. Read your tariff closely, estimate production conservatively, and compare the result with your actual usage. Revisit the numbers each year, and confirm any decision with the utility and a qualified installer.

Ready to choose one?

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.