Words similar to usefullife

Example sentences for: usefullife

How can you use “usefullife” in a sentence? Here are some example sentences to help you improve your vocabulary:

for a period equal to or greater than 25 years or 70 percent of the economic usefullife of the unit determined as of the time the unit was built, with option rights to purchase or release some portion of the capacity and associated energy generated by the unit (or units) at the end of the period.