@Lizzie
I can provide a wealth of information regarding green electricity because that is what we use here Lizzie.
If sun and wind ceased totally for 7 days I could still be powering our property at our normal useage rate with stored green energy without dragging anything from the electricity grid.
I understand and have had to deal with all aspects of green power generation both with solar and with wind, and battery storage, I understand all the principals and would be glad to give other hosts advice.
Unfortunately green energy results are a bit like asking...'how long is a piece of string'! Every property and location is going to end up with a differing result.
I also understand the number of hosts who would choose to commint to and energy generation system are very limited and that is why I won't give any tips here but if any hosts would like to pursue alternate energy generation I would be glad to help with advice either privately or publicly here for the benefit of many.
Cheers......Rob