Do not have or endorse this product but looking at the product page it may be the quick and easy solution.
https://mikrotik.com/product/wireless_wire_cube_pro
Powering it at the far side will be the challenge but you seem to have some ideas.
What I dont like is that within the same website they provide two distances, fast within 1 km, connectivity up to 2.4km.
This speaks to some degradation between 1KM and 2.4KM. However, 1KM is more than your stated distance so probably Just Fine.
60hz is less effective in snowfalls and heavy rain…
Other products for greater distances…
http://forum.mikrotik.com/t/cube-pro-distance/181037/3