Solar Calculators for Portland, Oregon

Free tools with illustrative Portland planning inputs. Replace energy rates and installation costs with your bill and written quote.

Quick answer

Start with your exact utility account and roof design. The 3.8 sun hours and 11.0 cents/kWh below are planning assumptions, not verified current rates for Portland. Confirm PGE / Pacific Power eligibility and export settlement.

Notes updated 2026-07-26

Best for: Portland homeowners comparing a proposal or estimating savings before calling installers.
Inputs needed: 12-month kWh usage, roof shade, PGE / Pacific Power, quoted $/W
Formula used: Local production = system kW × local peak sun hours × 365, then adjusted for losses.
Method references: NREL PVWatts, PGE / Pacific Power, Oregon incentive rules

Peak sun hours

3.8

hrs/day planning assumption

Illustrative energy rate

11.0¢

per kWh (PGE / Pacific Power)

Typical install cost

$2.9/W

planning assumption, not a market median

Net metering policy: Full retail net metering ✓

What Portland homeowners should check

Portland systems benefit from long summer days but must account for cloudy winters, tree cover, moss, and wet-roof maintenance. Shade measurements and roof-condition checks are more reliable than estimating from orientation alone.

Portland General Electric and Pacific Power use separate service territories and interconnection procedures. Confirm the serving utility and current Oregon rebate eligibility before signing a contract.

At the state level, Oregon currently uses full retail net metering. A typical interconnection takes 4–8 weeks, but utility review and local permitting can extend that range. Check current rules before relying on a proposal's export-credit or installation-date assumptions.

What should I verify before signing a solar contract in Portland?

Confirm that the quote names your actual utility, uses a recent electricity rate, includes measured shade and roof-condition findings, and explains who handles permits and interconnection. Ask the installer to separate guaranteed equipment and workmanship terms from estimated production, incentives, and savings.

Illustrative 8 kW system in Portland

Annual production

9,534 kWh

Retail-value ceiling

$1,049

System cost (est.)

$23,200

Energy-only cost/value ratio

~22 yrs

Illustrative 3.8 peak sun hours, 14.08% production losses, 11.0 cents/kWh and $2.9/W. The retail-value ceiling assumes every kWh earns retail value; lower export credits reduce it. The cost/value ratio is not a full payback model and excludes repairs, financing and rate changes. No new Section 25D homeowner credit in 2026.