 We know what the cumulative efficiency is actually we have looked at that in the previous diagram We talked about it on this diagram We are looking at cumulative or overall Efficiency of a qualified power plant Basically in the ground we have called right of it We have to bring the call out to the surface that step is called mining Obviously we need to spend some energy to bring the call From the ground to the surface so mining itself by itself has some kind of let's say about 95% efficient or That step is 95% efficient in other words if we have 100 units in the ground and By the time this energy comes out to the surface We will be left with only 95 units because five units We will be spending in operating the equipment in bringing the call from the ground to the surface now this 95 Obviously is not readily available because we need to take this 95 these 95 BTUs to a power plant so the trucks have to use some energy to take these 95 BTUs All the way up to the power plant so when it reaches the power plant This 95 these 95 units may turn out to be 90 units In other words, we will be spending about five units in the transportation So once we put in 90 units into a power plant, which is roughly about you know 33% efficient or 35% efficient So what this tells us is when we put in 90 units into the power plant the output from a power plant in the form of electricity is only 30 units so now At this point We have only 30 units left over when we started our business with 100 units now these 30 units We are transported through these high Voltage lines to a user by the time you get to the user We're talking about you know a unit or two loss Alright, and now when we have about let's say for simplicity purposes We will still have about 29 units here or 30 units and as you all know The efficiency of a light bulb is notoriously low It's about five percent efficient Which means that out of this 29 units or 30 units that we will get Into the home only five percent of that or one and a half units are converted really to the light so we started off with 100 and We ended up with one and a half units of light so that means the overall efficiency is 1.5 divided by 100 both are BT use here so The overall efficiency is only one and a half percent that is Pathetically low, which means to use one and a half units of light. We are taking from Mother Earth 100 units and Along the way, we are dumping about 98 and a half units of energy During various steps of conversion processes, and we are finally using 1.5 BT user 1.5 percent that is the message