In the case of Electricity it took 75 years to see the economic benefits of it in Full Action

Of course this is from it's invention (likely it's practical use began in the late 1800s) but it's invention was likely in Lightning bolts that even cavemen saw and wondered about during lightning storms.

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when was electricity invented 

Electricity was not invented on a single day, but discovered and harnessed over thousands of years. Ancient Egyptians wrote about electric fish in 2750 BC, and static electricity was noted around 600 BC. Practical electrical power for public use and homes began in the late 19th century with commercial power stations in 1882. 

Ancient Discoveries and Early Theories

2750 BC: Egyptians write about electric catfish and shocks.
600 BC: Greek philosopher Thales finds that rubbing amber with fur creates static electricity.
1600 AD: English physician William Gilbert coins the word "electricity". 

Scientific Breakthroughs

1752:
Benjamin Franklin proves lightning is electrical with his kite test.
1800: Alessandro Volta builds the first electric battery.
1821: Michael Faraday makes the first electric motor. 

Commercial Power and Homes

1882: Thomas Edison opens the Pearl Street Station in New York, the first public power plant.
1882: The first U.S. home gets electric power via a hydroelectric plant in Wisconsin.
1930s–1960: Grid systems expand globally, bringing electricity to most rural and urban homes. 

If you would like, I can share more about how Thomas Edison and Nikola Tesla competed over power systems, or how electricity spread to your specific region.

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  U.S. Energy Information Administration (EIA) (.gov)

  Electricity timeline - Energy Kids - EIA

  Around 600 BC. Thales, a Greek, found that when amber was rubbed with silk, it became electrically charged and attracted objects. ...

  
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  Mr. Electric

  The History of Electricity Timeline

  It was first used for lighting, but has since been used for many other appliances and electronic devices. Here's some information ...

  
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  Pulse Energy

  A brief history of electricity - Pulse Energy

  Where it all started * Ages ago: Long before we understood the concept of electricity, people were aware that certain types of fis...

  

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