There is a commercialized version of iron-dome, baring the noninteresting name drone-dome [0]

And there are multitude of other players in this field* [1]

* examples are from Israel because I already know the names so the search is faster, surely there are multiple global providers of similar systems

[0] https://www.rafael.co.il/worlds/air-missile-defense/c-uas-co...

[1] https://convexum.com

But is there enough laser energy to change the course of fixed wing drone? I am afraid, that such drone shot by laser will still deliver explosives to intended location. Of course, quadcopter has no chance against it.

If by 'drone' you mean 'cruise missile', sure: [1]. Of course the interest in this area are so intermingled that literally anyone could lie behind this, from the Saudis themselves (who need the oil price to go up to at least $80/barrel for their budget to stay in the black) to the Iranian regime (who are actively sponsoring opposition to the Saudi regime as well as many other regimes in the region) to the myriad of islamic militant groups which sprang out of the myriad of conflicts in the area.

[1] https://www.asiatimes.com/2019/09/article/saudi-oil-facility...

Re-engineer the plants to run on Victorian technology and have regular massive emp pulses to cover the facility? Let's face it, out of any industry this one has a tonne of cash to throw at solutions.

Might be cheaper to surround it with a colossal chain link dome, if money is no object.

Or build it underground.