Solar energy

Solar energy (or Sun energy) is radiant energy emitted by the sun. Rajh  oversees the energies that have both sparked life and snuffed it out in an untold number of his kin. Considered the mightiest of his fellow constructs, Rajh holds the power to unleash the fury of a thousand suns upon Azeroth.

Druidism
Druids have access to solar spells such as:


 * Wrath
 * Sunfire

Tauren Seers and Sunwalkers
The Sunwalkers are an order of tauren paladins and Seers ale priests. They were founded by Aponi Brightmane after a series of theological discussions with Tahu Sagewind about the importance of balancing out the night-elven focus on moon-worship through reverence of light as part of their worship of the Earth Mother. As such, the Sunwalkers are warriors who wield the power of An'she as they did in the past, the sun in tauren mythology.

Arakkoa
While the ancient Apexis society used the Light, the solar energy used by the more modern Adherents of Rukhmar is the same nature magic type that druids use.

Apexis Core is "The heart of Apexis technology - solar energy condensed into a resin crystal." Apexis guardians are mechanical constructs created by the arakkoa, powered by solar energy.