The graph compares four different sources used to produce 
electricity
 in France from 1980 to 2012. Units measured in terawatt Use synonyms
hours
 (TW-h). 
Use synonyms
Overall
, nuclear Linking Words
energy
 was the most popular source used to generate Use synonyms
electricity
 over the thirty-two-year Use synonyms
period
, Use synonyms
while
 renewable Linking Words
energy
 was rarely used for the same purpose. 
In 1980, thermal Use synonyms
energy
 was the most used source, producing about 125 Use synonyms
terawtt
 Correct your spelling
terawatt
hours
 of Use synonyms
electricity
. Use synonyms
This
 was rapidly surpassed by nuclear Linking Words
energy
 about a year later, becoming the Use synonyms
dominent
 source of Correct your spelling
dominant
electricity
 by 1981. Use synonyms
Electricity
 generation from nuclear Use synonyms
energy
 continued to dominate over the given Use synonyms
period
, peaking in 2006 at around 425 TW-h. In the meantime, electric generation from thermal sources continued to drop from 1980 until 1988, when its use fluctuated around 50 Use synonyms
terawatt 
Add a hyphen
terawatt-hours
hours
 Use synonyms
thereafter
. 
There were hardly any changes in the use of hydroelectric and renewable Linking Words
energy
 over the Use synonyms
period
. Use synonyms
Electricity
 produced from renewables Use synonyms
were
 close to zero until 2006 were it started to minimally rise peaking at approximately 25TW-h in 2012. Change the verb form
was
On the other hand
, Linking Words
electricity
 generated from hydroelectric sources maintained stability over the Use synonyms
period
 at around 60 terawatt Use synonyms
hours
.Use synonyms