Next to Food Production Fuel Production and Power Generation are the most critical occupations in the Twilight:2000 world.
What started as home DYI projects before the war have become big business in post-Twilight War villages. The electricity produced by these wind turbines help speed the recovery and survivability of villages they are in.
While many oil fields have been destroyed, or have run dry, modest amounts of crude can still be brought to the surface. With the right tools and knowledge this can be refined into usable petrolatum products.