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TIERED Rate Structure

Solar ROI for Seattle City Light Customers

Seattle City Light charges an average of $9.8¢/kWh. A 7 kW solar system produces a -$3,503 NPV over 25 years.

$13,965
Net System Cost
-$3,503
25-Year NPV
19 years
Payback Period
$0.187/kWh
Solar LCOE

Seattle City Light Rate Structure

ParameterRate
Average residential rate$9.8¢/kWh
Rate structureTIERED
Export credit policy1:1 net metering with annual true-up

Solar System Economics

A 7 kW solar system for a Seattle City Light customer costs $19,950 before incentives. The 30% federal ITC saves $5,985. The net out-of-pocket cost is $13,965.

At Seattle City Light's $9.8¢/kWh average rate, the system saves $755 in year one, producing 7,700 kWh. The solar LCOE of $0.187/kWh is -91% below Seattle City Light's current rate.

Battery Storage for Seattle City Light Customers

$8,400
Battery Net Cost
$0
Daily Arbitrage
$0
Annual Arbitrage
-$11,382
25-Year Battery NPV

Seattle City Light uses a tiered rate structure without significant peak/off-peak spread. Battery value comes primarily from backup power and net metering optimization rather than TOU arbitrage.

FAQ: Solar for Seattle City Light Customers

How much can Seattle City Light customers save with solar?
A typical 7 kW solar system saves Seattle City Light customers approximately $755/year in electricity costs. Over 25 years, the NPV of savings after system costs is -$3,503.
What is Seattle City Light's rate structure?
Seattle City Light uses a tiered rate structure at an average of $9.8¢/kWh. Without a large peak/off-peak spread, battery storage value comes primarily from backup power and net metering optimization.
Does Seattle City Light offer net metering?
1:1 net metering with annual true-up
Should Seattle City Light customers add battery storage?
Battery storage for Seattle City Light customers has a 25-year NPV of -$11,382. The economics are marginal based on TOU savings alone, but backup power value and future grid services programs may change the equation.

Other Utilities in Washington

Puget Sound Energy (PSE)
$11.8¢/kWh · FLAT
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