I would factor in the cost of applying for a LTR into your retirement planning if you plan to relocate here permanently when the house is built. I live here and work here already and thinking about what to do when i retire already have houses in my wifes name and a son with plenty of visa options.
As many here mention you need to see in your contract if you pay the local govt rate about 4 thb per kw or if you are contracted to pay what is stated in your lease agreement which its not unheard of to be double the PEA rate and based on your usage I’d just guess that will be the case as you mentioned your landlady gives you the bill every month it’s unlikely that your are indirectly paying next doors electric unless its actually the Landlady living there. Bottom line is if you’re happy there just suck it up until the lease comes up next.
Just a small hint no matter how you transfer if your planning on buying a condo make sure that you put purpose of transfer into Thailand is to buy a Property and that the bank you use provide you with a TT3 which is proof of an International Money Transfer. 😊