Proposed new rules covering connecting to the utility power grids in Arizona have been under study (DOCKET no. RE-00000A-18-0405) since about December 2018. At their Jan. 16 meeting the ACC approved new draft interconnection rules that could help link renewables and batteries to the grid, making it easier for customers across the state to utilize.
There is a good description of these new rules and their significance at: https://tinyurl.com/ya24baws
See the 4-26-19 Staff Report for a good summary: https://docket.images.azcc.gov/0000197570.pdf
On 2-12-2020 the ACC posted a staff Retail Electric Competition report http://docket.images.azcc.gov/E000004894.pdf a fact-based review of electric restructuring initiatives and challenges in competitive electric markets in the United States.