Answer:
4
Explanation:
The formula for calculation of EROI is :
[tex]EROI=\frac {\text{Energy delivered}}{\text{Energy required to deliver energy}}[/tex]
Thus,
Energy returned = 20 MW
Energy invested = 5 MW
So,
[tex]EROI=\frac {\text{Energy delivered}}{\text{Energy required to deliver energy}}=\frac {20\ MW}{5\ MW}=4[/tex]
The EROI of the process will be 4.