Mmmm, it would be useful to calculate on a sliding scale...
- Running a generator on red diesel for peak demand loads (Washer, Dryer, Kettle, Microwave, Cooker).
- Running off Solar PV for background loads (Fridge-Freezer, Lighting, TV, Laptop).
Precisely how the place is heated is going to be an important consideration.
Solar PV needs a mains inverter with shelf spare unit (they are not that reliable and not cheap). Batteries have a finite life, specific usage profile for optimum life and substantial cost.
Lighting needs careful selection, TV would be low backlight demand (TN v PVA/IPS LCD and certainly not plasma), laptop low energy not difficult at least compared to old P4 Prescott (appropriate choice of fat ass name).
As TNP says, the huge component of a grid connection is the "groundworks". The transformer and associated switchgear may be sized for multiple houses incidentally, you are not just paying for yourself but essentially a "new development". This is why some people block mains gas coming to towns, it keeps developers away. Likewise lack of electricity can keep anyone away as initial inquiries regarding cost are met with high ass-covering estimates.
You CAN get other quotes for grid connects as I recall, but usually not simple domestic. This is not likely to be simple domestic because of MV cable, TX, Box & Digging & Concrete & Teeth Sucking & Tea Drinking involved. So check carefully.
Example, moving a gas meter 0-2m with no groundworks and no re- instatement =3D =A3408. Moving a gas meter 0-2m with groundworks & re- instatement =3D =A31050. When the distance gets to 20m, it gets worse, more than that and they ask you what colour Ferrari they look good in as they come out.