Complete Guide To Rooftop Solar Power: Costs, Benefits
Everything you need to know about rooftop solar power in 2025. From costs and savings to installation and maintenance - your complete guide to home solar panels.
Without BESS, the same household could install 10 kW of rooftop solar, which would cost $28,700 and save $1,567 per year. PGE and the state of Oregon both offer incentives for rooftop solar and battery energy storage. With the utility, state, and federal incentives, the combined solar and BESS system could be paid back within 11 years.
In Oregon, a 7.5 kW rooftop solar system plus a 13.5 kWh BESS would cost $43,125 on average to install without incentives. The state's largest utility, Portland General Electric (PGE), offers a TOU rate option, and Oregon also has a net metering policy, paying the same utility rate for excess solar production.
To help homeowners tackle this tangle of information, PNNL researchers Jessica Kerby and Bethel Tarekegne published an open-access guide to rooftop solar and BESS in Renewable Energy Focus.
Without BESS, the same household could install 10 kW of rooftop solar, which would cost $29,200 and save $1,357 per year. Without financial incentives, the payback period for the rooftop solar and BESS would be around 28 years, but with the Investment Tax Credit it's brought down to 20 years.
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