How much grass is needed to power a house

Question

Please help I don’t know how to help my child answer the following questions:

how much grass would it take to sustain the energy levels of a house?

Answer 1

To answer this question, you need to know 2 things:

(1) How much power does a unit of grass produce? For example, kilowatts hours per kilogram of grass?

(2) How much power does a house consume? For example, kilowatt hours?  This one obviously depends on the size of the house and the activities that are performed in the house.

Divide the number from (2) by the number from (1), working in appropriate units.  That will give you the number of units of grass that you need.