Saving energy is less important than cutting out human labor (drivers). For context, the global average cost for electricity is about $0.13 USD per kWH. From w

Saving energy is less important than cutting out human labor (drivers). For context, the global average cost for electricity is about $0.13 USD per kWH. From wikipedia, "Over an 8-hour work shift, an average, healthy, well-fed and motivated manual laborer may sustain an output of around 75 watts of power." [0] So, from a purely mechanical perspective, a human can only output about 0.6 kWH of work per day, which is only worth about $0.08 of electricity per day. And yet, in states like California, where this test is being done, human labor costs a minimum of $15/hour, or $120/day. Energy is not the limiting factor. We could use drastically more energy and still save gobs of money if we can cut the cost of employing a human out of the loop. [0] - https://en.wikipedia.org/wiki/Human_power https://en.wikipedia.org/wiki/Human_power