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Solar

Rooftop panels and utility-scale solar farms.

8 articles

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How much maintenance do solar panels need

Most home solar systems keep at least 80% of their original power output after 25 years, the US Department of Energy says,…

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How to improve solar panel efficiency

Solar panel efficiency is the share of sunlight a panel turns into electricity, and residential panels sold in 2026 typically run from…

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How solar inverter efficiency works

A solar inverter's efficiency is the share of the panels' DC power that comes out the other side as usable AC power,…
Rooftop solar panels at Ala Moana Center in Honolulu, Hawaii

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How Hawaii became the US leader in rooftop solar

Hawaii solar leads the US. Nearly half of Oahu's single-family homes have rooftop panels, and 92% of new Honolulu systems come with a battery.
Solar panels on the roofs of homes

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How net metering works

See how net metering works in 2026, why California traded it for a new billing tariff, and how feed-in tariffs and solar leases stack up against it.
NRC inspectors in hard hats at the Vogtle Unit 3 nuclear construction site in Georgia

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Is solar power cheaper than nuclear power today?

Is solar cheaper than nuclear? Lazard's 2025 unsubsidized data puts solar at $38 to $78 per megawatt-hour versus $141 to $220 for new nuclear.
Rows of solar panels at the Topaz Solar Farm in California

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Why solar keeps beating the IEA’s growth forecasts

The IEA solar forecast undershot actual solar growth for more than a decade, and its newest outlook moved down for policy reasons instead of up.
Aerial view of the 72,000-panel solar field at Nellis Air Force Base in Nevada

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How fast solar power is growing in the US and worldwide

Solar led new US power capacity for the fifth year running in 2025 and set a global record, while a new US tax law is set to slow installs through 2031.