Beyond Net Metering: What Washington’s New Solar Study Means for Homeowners

A long-awaited report from the Washington State Academy of Sciences offers a roadmap for the future of solar and battery storage in Washington—and reinforces why homeowners should explore their options while retail-rate Net Metering is still available.

For years, Washington’s solar industry has been waiting for answers about what comes after retail-rate Net Energy Metering (NEM). NEM has helped thousands of homeowners invest in solar by allowing them to receive bill credits for excess electricity sent to the grid at the retail electricity rate.

Now, the Washington State Academy of Sciences (WSAS) has published its long-awaited report, Beyond Net Metering: Designing a Policy Portfolio for Measuring and Realizing the Value of Distributed Solar and Storage in Washington.

Commissioned by the Washington State Department of Commerce at the direction of the Legislature, the report examines how Washington can measure the value of customer-owned solar and battery storage—and develop policies that make the most of these resources in the years ahead.

The report does not establish a replacement compensation rate or endorse a single successor tariff. Instead, it offers an important framework for policymakers as utilities approach the limits of the existing Net Metering program.

For Washington homeowners considering solar, its findings are important to understand because the future of solar compensation for homeowners is changing. Two things are very clear: batteries will play an increasingly important role moving forward, and the current retail-rate Net Metering framework is not permanent.

What does this mean for Washington homeowners?

The WSAS report is an important step toward understanding what comes after Net Metering, but it is not the final word on how future solar exports will be compensated. It also offers Washington an opportunity to learn from the experiences of other states—including California, where changes to solar compensation have significantly altered the economics of new residential solar projects.

A key lesson is that how Washington makes the transition matters. Abrupt or overly drastic changes could make solar less attractive to homeowners and slow adoption. A thoughtful approach that recognizes the value of solar and storage, provides a more predictable path forward, and gives the industry time to adapt could help Washington continue expanding distributed energy resources while managing costs for all utility customers.

What happens after retail-rate Net Metering?

Washington’s Net Metering law, established in 1998, helped create a foundation for the state’s residential solar industry. Under the current framework, solar customers receive bill credits for electricity their systems send to the grid at the retail electricity rate.

However, the law includes a limit tied to each utility’s historical peak demand. Net Metering is also subject to a statewide statutory endpoint of June 30, 2029, unless a utility reaches its applicable cap sooner.

Several Washington utilities have already reached or approached their statutory thresholds. As a result, the transition away from the existing framework is not simply a question for the distant future.

The WSAS report was intended to help Washington evaluate the value of distributed solar and storage and consider how that value might be recognized under future policies.

One important distinction: the report does not tell homeowners exactly what their future export credits will be. Those decisions will require additional Washington-specific analysis, regulatory proceedings, and potentially legislative action.

What about existing Net Metering customers?

Washington law includes provisions protecting qualifying customers who entered Net Metering before their utility’s applicable statutory deadline or 4% cap. Under RCW 80.60.020, utilities must continue providing credits under the existing provisions to qualifying customers whose existing interconnection agreements remain valid.

This is reassuring news for homeowners who have already invested in solar under Washington’s current rules. The law provides a measure of protection for existing customers as the state transitions toward new approaches to valuing solar and battery storage.

For homeowners who already have solar, the takeaway is that the transition does not mean losing the Net Metering benefits they signed up for. For those considering a new installation, the opportunity to qualify under today’s NEM framework is time sensitive.

At Sunergy Systems, we help homeowners navigate utility requirements and the solar installation process, so they can understand their options without having to become experts in changing energy policy.

The biggest finding: Washington needs a portfolio of policies

One of the report’s most important conclusions is that no single policy mechanism can capture all the benefits that distributed solar and storage can provide.

Instead, WSAS identifies four complementary approaches that policymakers can use together:

• Retail rate design: Establishes the electricity prices and compensation signals customers experience, including the value assigned to electricity exported to the grid.
• Grid-services tariffs: Compensate systems for providing specific services or responding to grid needs, such as managing demand at particular times.
• Utility procurement: Allows utilities to contract for distributed energy resources that help address specific system needs, potentially creating value for ratepayers when projects are competitively selected.
• Deployment incentives: Helps customers overcome upfront financial barriers to adopting solar and battery storage.

Each mechanism serves a different purpose. Retail rates can provide a broad, consistent price signal, while grid-services tariffs and utility procurements can target particular needs. Incentives can help more customers participate, but an incentive alone does not guarantee that a system will operate in ways that benefit the grid.

The report’s message is that Washington should evaluate how these policies work together—not simply replace one export-compensation rate with another.

For homeowners, that means the future value of a solar installation may depend on more than how many kilowatt-hours it produces. The timing of that production, how the system operates, whether it includes storage, and the policies governing its use can all matter.

Why pairing solar with battery storage matters

One of the report’s clearest findings is that adding battery storage is the single most consequential factor in realizing a wider range of benefits from distributed energy resources.

Solar panels generate electricity when sunlight is available. A battery allows homeowners to store some of that energy and use it later, including in the evening when solar production declines.

Storage can also make a system more flexible. Depending on the battery controls, utility program, and applicable tariff, a battery may be able to respond to electricity prices or grid needs by changing when it charges and discharges.

The WSAS analysis found that storage-enabled systems achieved higher or equal benefits compared with solar-only systems across the benefit factors it examined.

That doesn’t mean every homeowner needs a battery, or that a battery will always pay for itself. Battery economics depend on installation cost, electricity rates, household consumption, operating rules, incentives, and the value placed on backup power.

But the study makes a strong case for policymakers to consider solar and storage together when designing Washington’s next generation of distributed energy policies.

For homeowners, batteries can also offer a benefit that extends beyond utility bill savings: backup power during an outage. The amount of protection available depends on the system design, battery capacity, electrical loads, and whether the home is configured for backup operation.

As the state considers its post-Net Metering framework, battery storage will be a critical piece of the puzzle

Another important insight from the report is that battery systems need to be thoughtfully designed in order to maximize their value to the grid.

How a battery is operated can affect both the benefits it provides and the costs it creates for the electric system. Appropriate operating rules, dispatch signals, and technical requirements can help align battery activity with grid needs.

Without those considerations, increased storage deployment can introduce meaningful system costs or fail to deliver the full benefits policymakers expect.

This is why the report emphasizes mechanism design as much as mechanism selection. It isn’t enough to decide that Washington should support batteries; policymakers also need to determine how those batteries should be operated, compensated, and evaluated.

The same principle applies to solar exports. Electricity delivered to the grid can have different values depending on when and where it is generated and what the grid needs at that time.

A future policy framework that accounts for those differences could better align compensation with the actual services distributed energy resources provide.

Washington’s electricity needs are changing

The timing of this discussion is obviously critical because Washington is preparing for substantial electricity demand growth driven by data centers, electrification, industrial activity, and other changes in how energy is used.

Utilities are planning for additional generation, transmission, and distribution investments. Distributed solar and storage will not replace the need for large-scale energy infrastructure, but appropriately located and operated systems may help meet some needs or defer certain investments.

For example, a battery that reduces demand during a constrained period could provide a different kind of value than a solar system that exports electricity during hours when the grid already has abundant supply.

The challenge is identifying where those benefits exist and creating policies that encourage them.

The WSAS report points toward more detailed, Washington-specific data and modeling to support those decisions. That work will be important as regulators and utilities determine how to value distributed energy resources in different locations and under different operating conditions.

What about the debate over cost shifting?

A major concern in the Net Metering debate is whether compensating solar customers at the full retail rate can shift some electricity system costs onto customers without solar.

Retail electricity rates include more than the cost of generating energy. They also support transmission, distribution infrastructure, utility operations, and other costs of delivering electricity.

If the compensation paid for exported solar electricity exceeds the costs the utility avoids, some costs may be recovered from other ratepayers. This is commonly called cost shifting.

The WSAS report treats cost shifting as an important consideration, particularly in retail-rate design. But it also emphasizes that the result depends on which benefits and costs are included in the analysis.

For example, a narrow calculation focused on avoided energy costs may overlook other potential benefits, such as capacity value, certain grid services, or resilience. Conversely, those benefits should not simply be assumed; they need to be evaluated using appropriate evidence and methods.

The report also notes that storage-related costs and benefits interact with the cost-shift question. Policymakers should evaluate them together rather than treating each issue as a separate calculation.

The goal is to develop a framework that recognizes the value distributed energy resources provide while protecting customers who cannot install solar or storage from unfairly bearing system costs.

A potentially important role for utility procurement

Among the report’s findings, utility procurement stands out as a mechanism with significant potential to produce positive net value for ratepayers as distributed energy markets mature.

Under this approach, utilities can seek contracts for resources that address specific needs, rather than relying exclusively on a standard compensation rate available to every eligible system.

Competitive procurement can help identify projects capable of meeting a defined need at an acceptable cost. However, its usefulness depends on the existence of a suitable grid need, the design of the procurement, and the costs of administering and delivering the service.

For residential solar customers, utility procurement may not be as immediately visible as an export credit on a monthly bill. Nevertheless, it could become part of a broader framework that creates value for distributed resources alongside retail rate design, grid-services programs, and incentives.

The report’s overall message is that Washington has an opportunity to coordinate these mechanisms rather than relying on one policy to accomplish every objective.

In Conclusion, here are the practical takeaways for homeowners

1. Current Net Metering rules still matter.

Washington law provides protections for qualifying existing Net Metering customers, but the transition is underway. For homeowners considering a new solar installation, the opportunity to qualify under the current retail-rate framework will likely end in the not-too-distant future (exact timing TBD).

2. Solar may still be a good investment, but the financial picture could change.

If future policies reduce the value of electricity exported to the grid, homeowners may see lower financial returns than they would under today’s retail-rate Net Metering system. Solar will still deliver long-term value, but system design and utility compensation rules will matter even more.

3. Batteries are likely to become much more common.

One of the report’s clearest findings is that pairing solar with storage can deliver a wider range of benefits. If future compensation policies place less value on exporting electricity, storing solar power for use later may become increasingly important to a project’s economics. Other states have seen battery attachment rates rise as their solar compensation policies have changed. Solar-only systems may still make sense for some homes, but batteries are likely to become a much more common part of new installations in Washington.

4. Existing customers have important legal protections.

Washington law includes provisions requiring continued credits for qualifying customers who entered Net Metering under the applicable statutory limits and maintain a valid interconnection agreement. This offers reassurance to many homeowners who have already invested in solar, although the law does not guarantee that every customer’s arrangements will remain unchanged indefinitely.

5. A well-designed system matters more than ever.

Roof orientation, household electricity use, utility rates, system size, battery capacity, and future compensation rules all affect the financial picture. A system should be designed around your actual energy needs and long-term goals—not simply to maximize the number of panels on your roof.

Considering solar? Start exploring your options now.

Washington’s solar policy is entering an important transition. The WSAS report gives policymakers a stronger foundation for deciding how distributed solar and storage should contribute to the state’s energy future. It also highlights an opportunity for Washington to learn from other states and make the transition in a way that recognizes the value of solar, supports continued adoption, and avoids unnecessary disruption.

For homeowners, the bottom line is straightforward: the financial benefits of going solar could change as Washington moves beyond retail-rate Net Metering. If future policies place less value on exported electricity, batteries may become increasingly important to getting the most out of a solar installation. That could raise upfront project costs and reduce the return on investment for some homeowners compared with today’s Net Metering environment.

That doesn’t mean solar will stop making sense. It means the timing, technology, and design of your system deserve careful consideration—and waiting could mean facing different rules and economics.

At Sunergy Systems, we make the process straightforward. Our team will help you evaluate solar and battery options for your home, navigate utility requirements, and manage the steps involved in moving your project forward. We’ll explain your options clearly and design a system around your home’s energy use, budget, and long-term goals.

Contact Sunergy Systems today to explore your solar and battery options while the current Net Metering framework is still available to eligible new customers.

The rules are evolving. Getting started now gives you more time to explore your options with an experienced local team.

Source: Washington State Academy of Sciences, Beyond Net Metering: Designing a Policy Portfolio for Measuring and Realizing the Value of Distributed Solar and Storage in Washington (October 2026).