The interconnection of devices that generate electricity, like solar panels, to the electricity grid are called net metering. If you've decided to invest in a solar or wind electric power generating system, rather than purchasing electricity from the utility, you can generate some or all of your own clean, renewable power. If you generate more electricity than you can use, net metering allows that electricity to flow back into the power grid for use by other customers. Essentially, excess electricity generated through your system will flow back through your utility meter and turn it backwards--essentially subtracting from the electricity you might have already purchased. In the event that you generate more electricity than you purchase, a credit balance will show up on your following month's bill. This credit can be used to offset future electricity purchases.

How it works

A home's standard, primary utility meter records the net use of electricity and how much is being generated. For example, if you have a 1000 Watt photovoltaic system that generates 150 kWh in July and you use 600 kWh in your home that same month, the net recorded on your meter will be 450 kWh. You pay the difference of 450 kWh on your utility bill. By slowing the meter down with electricity production, you receive the retail rate for producing electricity, which equals about 6.5 cents per kWh.

View an example of real-time solar production at The EnviroHouse.

Fact sheet - Solar net metering and financial incentives

Follow these eight steps to connect your renewable energy system to our electricity grid.

1. Review our checklist for interconnection.

2. Review our net metering standards.

3. Finalize the design and plans for your renewable energy system.

4. Submit your net metering application.

5. Submit your signed net metering interconnection agreement.

6. If you want to apply for financial incentives, submit a signed production metering agreement. Your installation must include a meter to measure your renewable energy production.

7. Have your renewable energy system installed.

8. Schedule a final inspection of your installation by calling (253) 502-8541.

View our solar installation drawing template. For more information call (253) 502-8619.

We participate in Washington state's Renewable Energy Annual Incentive Payment Program. If you become a net metering customer and track your energy production with a second meter, you can apply for an annual payment based on your electricity production.

As of summer 2010, we are interconnected with 45 residential customers and two community colleges - Tacoma Community College and Pierce College - who contribute renewable energy to the utility grid. These customers generate power with solar electricity - photovoltaics - and one also contributes with a small wind generator.