Customers of Tucson Electric Power and other Arizona utilities could face much lower bill credits for excess solar energy they export to the grid.

The rail line, which is expected to link Phoenix to Tucson, received assent from the Federal Railroad Administration in June.

Large parts of the United States faced a radio blackout on Thursday following a strong solar flare from the sun. The "extreme ultraviolet flash" was captured by NASA's Solar Dynamics Observatory ...

Meyer Burger shut down module production activities at its manufacturing facility in Goodyear, Arizona, due to financial troubles, laying off all 283 employees.

Arizona's wildfire season typically peaks between April and July and could get more heated as vegetation dries out. Here's where fires are burning.

Solar-powered car completes first test drive on Route 66 starting in Flagstaff A solar-powered car that can go 300 miles on a single electric charge was tested in Flagstaff.

Astronomy fans figuring out where and what time to see the March 29, 2025, partial solar eclipse can check out a map from NASA.

March began with a lunar eclipse and will end with a solar eclipse. Here's the eclipse path, what time it will be visible and what states can see it.

Arizona lawmakers want more solar energy projects in western areas of the state, a goal that could get mixed support from the White House.

Arizona lawmakers want more solar energy projects in western areas of the state, a goal that could get mixed support from the White House.

A solar project aiming to supply western Arizona with clean energy was approved by the Bureau of Land Management, the agency announced.

The Bureau of Land Management announced Monday it has formally approved a large-scale project in southwest Arizona that would rank among the nation’s biggest power-producing solar projects.