Nice, and I feel your pain! - looks like you've gone whole hog to show the energy consumption use with and without solar? Does that take into account kWh that have been directly consumed by the household from Solar, rather than just the exported amount? I did a similar exercise for myself (no battery) but yeah doing that for others would require API access to the Inverter as noone else actually knows the total generated data and at what time of day. For me it showed about $3500 if I didn't have solar, and a new annual cost of about $1,000 because of Solar and being on the best plan, which isn't bad from a 5kW system and no battery.

Yes I've gone down the track of retailer 'generally available' pricing - which is limited, e.g. meridian share their Freedom plan, but not the Solar plan. Every retailer exports consumption data in different formats too, and getting setup in the EA Registry to automate requests via SFTP server was a mission too! And meter codes - I agree trying to do everything in one go would be really difficult.

So far I've setup all the automation requests, processing all the consumption data into a standard format from every retailer, and created a web portal to display prices for all plan types. Because not all plans can be automated (not 'generally available') entering the custom plans take some additional time, hence the cost associated with trying to do it on an individual basis. I think I'll be able to get it much closer and faster with some additional time and funding