Many renewable energy sources are intermittent. what does this mean, and why does it pose a challenge to the use of these sources for electrical power generation

Explanation:

Many intermittent

Intermittent renewable energy sources which are intermittent are difficult and challenging which means that they have an disrupting effect on the conventional procedures used to plan the daily maintenance and operations      of the electric grid. The power fluctuates over different and many time horizons which will force the operators to adjust it before time  i.e an hour ahead to day ahead to adjust the operating procedures manually.  

the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.