The situation is a zombie apocalypse where all our previous means of producing energy have been destroyed. In this situation we need to find new means of power.
We would use a combination of bio energy and hydroelectric energy and possibly wind energy due to our situation. Bio energy would be useful as to survive we would have to plant crops on the field and try to raise animals possibly taking them from local farms.
The problem with hydroelectric energy and wind energy which given our geographical location it'd be most productive is it would be hard to engineer these mechanisms. Especially hydroelectric energy as we would have to channel the sea into resoviours.
In summary at the start we'd maintain society using bioenergy and using any spare fossil fuels available to us while setting up wind turbines as this best suits our situation and where we are in the world as the sunlight hours are often short.