It controls excess demand.

Peak hours demand (evening hours lightening demand(6 to 10 p.m)) can manage by control excess demand (by proper scheduling of shifts) in industrial demand, can reduced the difference of maximum and minimum demand. 

The answer depends on the industry and how far the peak is from the typical quantity demanded.  For example, trying to use price to encourage movement away from peak times for emergency ambulance service is unlikely to be effective. Alternatively, it seems to work for the airlines, hotels, electricity, and several others.  It works on golf courses, where players pay a premium to play on the weekends, and especially in the mornings to avoid relatively hot US temperatures in the middle of the day.

Let's follow the golf course pricing model for illustration here.  The course has a finite capacity each hour and the closer we get to it, the less golfers tend to enjoy it (e.g., they frequently encounter delays as others face challenges ahead of them)   I like to think about problems like this as a series of demand curves (e.g., demand for a round of golf beginning at 7:00 am  likely differs from the demand at 3:00 pm.

We developed a pricing model that increased the price for the most popular times, which incidentally exceed capacity by a significant amount.   We recommended lower prices when relatively few golfers began to play on the municipal course here (e.g., 2:00 pm in the summer when the temperature around here approaches 1000 F (i.e., 380 C).  We expected less experiences golfers would not wish to pay premium prices and would be more eager to play at the lower price.  This should have improved the golfing experience for both groups by decreasing frustration of each. Few appreciate being hurried or slowed by others.   Even without the heat, peak load pricing can improve the situation.  

So then end result is more people able to play golf, a significant increases in the total revenue collected at the golf course, among other things.  We also proposed much lower fees for youthful golfers when the course was used the least.  This potentially would increase demand in the future to the extent they acquired more interest in the game.   

Elected officials were not excited about one aspect of this.  Can you guess? 

They were uncomfortable about the higher fees at peak times because they thought it sounded like a "tax increase."  

This is just one example that has some interesting implications.  The principle is the same and in theory in some industries, it could smooth reshape the load on an hourly or daily basis.  FedEx charges much more for Saturday service; the reasons should be obvious. On the other had, would an economist wait to call 911 for an ambulance when facing peak demand pricing?

Very interesting and philosophy answer. I liked it so much. Great thanks for that dear Prof.