1 1 in 5 households and businesses in the U.S. receive their electricity from nuclear energy. 2  Nuclear power facilities can produce energy at a 91% efficiency rate 24/7, with virtually zero carbon emissions.  13% of the worldâs electricity comes from nuclear power plants that emit little to no greenhouse gases.
In general, all post office job applicants must be at least 18 (at time of appointment). There are no maximum age limits for USPS positions. There are a few exceptions that may apply: The minimum age may be lowered to 16 for high school graduates.
Postal Service Jobs. 1  Must be 18 years or older. 2  Must be a U.S Citizen or have a Green Card. 3  Must pass USPS Exam 473.  Must have basic competency in 1  English. No field work experienceis required!  No high school diploma or GED is 1  required! A qualification for employment is to be drug 2  free. Military service is treated as prior employment.