The February 27th edition of the local newspaper reported that there are now two battery energy storage projects underway near Moss Landing, even- tually providing a total storage capacity of 1,930 megawatt-hours. The main purpose is to store energy from renewable sources for use when those sources are not producing energy (e. g., at night).

(a) How many joules of stored energy does this represent?
(b) Assuming a typical house uses 400W of electric power on average at night, estimate how many houses could be powered at night by this facility. Start by estimating how many joules of electrical energy one of these houses needs per night.