Ausgrid is running on my main pc that is Intel i5 LGA 1155 with 16gb ram memory and 500gb SSD and 1TB storage sata hard drive. Internet speed is 100/40 and no other plans for 100/100 in Australia.

Spare intel i3 LGA 1155 PC need 16gb Ram ($120-$150, New Power Supply ($80-$90). Later on i7 cpu ($150-$300) 

It need 1TB SSD that cost $400 in Australia.

If you do like Ausgrid very much you can welcome to donate but it up to you.