The Brotherhood of the Conch: In The Mirror of Fire and Dreaming, the jinn Ifrit strikes the nawab's pavilion with lightning, setting it on fire. People jump twenty feet down to escape, some of them breaking limbs in the process. Ifrit then fires lightning bolts into the panicked crowd, setting several people on fire.
Circle of Magic: Alhough Tris can wield other abilities, her chief attribute seems to be lightning, as she has been referred to as a lightning mage.
Codex Alera: Windcrafters cannot generate lightning by themselves. However, if a group of them are in a thunderstorm, they can, via group effort, gather the lightning generated by the storm and direct it at a target on the ground. In addition, a windcrafter who is also capable with watercraft can generate a sort of defibrillator via electrical generation while a patient is submerged in a healing tub.
Lightning bolts are a favorite tool of Discworld's gods, though Blind Io has a monopoly on thunder.
Dragonvarld: The first explicit spell that Ven casts is a lightning bolt, killing a bandit who beat his adopted mother Bellona severely along with his confederates. Draconas also later demonstrates the spell too because Ven tried to weakly deny this happened.
The first book has an evil sorcerer fueling his evil spells with massive lightning strikes. However, the main spell he used it for ripped people's hearts out, the lightning was used only to provide power.
Elaine appears to favor electricity for combat, using both lightning strikes and a magical electrocuting chain.
While Harry favors fire and force, he has a neat line in air magic (of which lightning is a part), and occasionally uses it, if only to surprise opponents who generally expect him to try and Kill It with Fire. The television adaptation has lightning as Harry's usual weapon of choice.
Forbidden Sea: Some of the merfolk have this power. In Shadow in the Sea, Captain Westwood is about to kill Sadelyn when Dakarai summons lightning from the blue sky, killing him instantly.
The Guardians each have a Gift related to their life. Jake's second Gift is electricity, and they're referred to as the human Taser.
The Infected has Sparks, the leader of Team Two, whose whole power is throwing around lightning bolts.
At the end of Roger Zelazny's Lord of Light, it's stated that the hero received that title "either because he could wield lightning or because he refrained from doing so." He was also capable of preventing electronic devices from working, just by willing it. Convenient, when your enemy wants to shoot you with a blaster.
Tabitha of Magic for Liars uses an arc of electricity both as a defense when threatened and as a classroom exercise for her Theoretical Magic students.
The Master Key: A tube that fires electricity to knock out a person for an hour.
In Mindwarp Toni Douglas has the power to absorb electricity and shoot lightning from her hands. Also time travel, with enough energy, but it takes her until the ninth book to learn how to use it on purpose.
Mouse (2017): When the school is attacked by azazim (essentially sentient zombies), Mouse kills two of them by using Hermetic Magic to summon lightning from the sky.
In Noob lightning appears to be an offshoot of air-based magic and can be used for short-range teleportation.
The main way of attacking for a witch or sorcerer in The Otherworld series and its spinoff Darkest Powers seems to be through throwing lightning bolts. These apparently range from lethal to non-lethal, with the damage depending on just how much OOMPH the user puts into the spell.
Thalia of Percy Jackson and the Olympians is the daughter of Zeus, and though she disappoints by being acrophobic, she can really bring on the voltage. In the sequel series The Heroes of Olympus, Jason, being the son of Jupiter, has the same abilities. He can also harness the wind and fly.
The Perfect Run: Augustus' first power is control over electricity. While he generally just uses it to shoot lightning out of his eyes, he can also recognize human nervous systems, throw up shields, and fly using electrostatic manipulation of the air.
The Power: This is the titular power, which (cis) women and girls develop, along with a few intersex males, due to an electricity-generating organ they grow.
Although the air-magic of Ruahks in The Quest of the Unaligned falls more under Blow You Away, the more powerful ones do get the ability to throw lightning or use walls of it to protect themselves.
In Rachel Griffin, fulguration is a valid dueling or combat skill, as well as being a sport in the Magical Olympics.
The Rainbow Magic series has this. In Storm the Lightning Fairy's book, an extra-mean goblin with red eyes shoots fairy lightning at the girls with the power of the Lightning Feather. While it isn't as dangerous as real lightning, it's still very threatening, to the point that no one in the entire book is hit by it directly.
In Renegades, the superhero Thunderbird can summon thunder and lightning.
Kilowatt, of the Seekers of Truth. Explained in-universe as the ability to manipulate electric charges, but for some reason, she still likes to just shoot lightning from her hands.
Septimus Heap: DomDaniel is planning to destroy Keeper's Cottage with a bolt of lightning when he's interrupted by the approach of the Dragon Boat.
In Adrian Tchaikovsky's Shadows of the Apt series, Wasp-kinden are able to shoot blasts of bioelectric energy from their hands.
In Shadow Ops, generating lightning and controlling electrical storms is a subset of Aeromancy.
In The Shadow Speaker, Dikeogu has the involuntary ability to attract lightning to himself.
Spellster: Lighthing bolts are the most common battle spell that Dylan uses, and other spellsters do also.
In Super Powereds, Vince is an energy absorber. The second type of energy he masters after gaining control after his previous state of Power Incontinence is electricity. However, unlike fire, which is easy to project, electricity is unpredictable and his bolts tend to split and wildly diverge beyond a few feet. He is later coached by an expert, who advises him to visualize a path for the bolt... but in reverse (i.e. from the target to his hand). This helps Vince direct his electrical bolts with great precision. Professor Karl Fletcher is an electrical elemental, and one of those rare ones that can completely become their element at will. During his introduction to the students, he takes out most of them in a second by turning into a bolt of lightning and moving at Super-Speed. He also retains some of the qualities of electricity even in human form, such as speed (and unlike flesh-and-blood speedsters, he doesn't need to accelerate or decelerate).
War Wizards in the Sword of Truth series. Both because it's dramatic (which can be at least as useful to winning a battle as killing people) and because Wizard battles are primarily about daisy-chaining counters and finding unusual vectors, so they can't always use their terrifying Wizards Fire.
In the Tempest (2011) trilogy, the titular half-mermaid has Weather Manipulation powers. In Tempest Unleashed, she discovers the ability to separate lightning from her other powers and blast her enemies through the water with electricity.
Uprooted: Agnieszka tinkers with a rain-summoning spell to call lightning out of clouds. It's Awesome, but Impractical, packing a huge punch even against super-tough enemies but leaving her battered, dazed, and temporarily deaf.
Joanna of The Weather Wardens series can use lightning as a weapon, and so can any other weather mage with the proper air/water elemental specialty.
Channelers in The Wheel of Time can summon lightning from an open sky, given proper skill in weather manipulation.
In The Wise Man's Fear, Kvothe called down lightning and smote one of the Chandrian and his minions in a terrifying display of Sympathy and physics.
The Witch of Knightcharm: Luban, a rookie witch at an evil Wizarding School, demonstrates the ability to summon clouds which she can ride on and which are able to shoot lightning at anyone she wants to hurt.
Parshendi stormforms in Words of Radiance, second book of The Stormlight Archive, can throw lightning as well as adding it to their punches and kicks. Luckily for the humans, stormform lightning behaves more or less like regular lightning, meaning that it's nearly impossible to aim. Unfortunately, the stormforms are immune to lightning, so they don't actually need to aim: Just pump out enough and some will hit the humans. Back on the lucky side, Shardplate was originally made to fight stormforms (among other things), and so makes its wearer immune to lightning as well.
Princess Elektra of Xanth. Though her powers are much weaker than most of those listed here. She can only use her powers at a lethal level once a day, for instance.
In The Zombie Knight, Karkash has the power of magnetic field alteration. It is implied by his impressive soul power that he took a very long time to gain the ability to fire lightning with it.
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