I had no idea that Unisource offers a $16 monthly discount:

A household gross income for the past 12 months that is at or below the following amounts, based on the number of people in your household:

Family Size

Annual Income at or Below:

1

$18,090

2

$24,360

3

$30,630

4

$36,900

5

$43,170

6

$49,440

7

$55,710

8

$61,980

The application is extremely simple:
https://www.uesaz.com/wp-content/uploads/2017/07/TEP-UES-Customer-Assistance.pdf
And it’s good for 2 years — the easiest way I’ve seen in a long time to make almost $400.