Don't ignore the lab. A fully upgraded Natural energy plant will produce up to 168 energy and only 6.4 smog. Also switching your gas type will GREATLY reduce smog. A oil type Garbage truck will produce 6.4 per each. A natural gas while produce 0.28 fully upgraded.
This game is great. If you actually READ the dialogues it will get you on a starting route. It does get stressful moving from the three towns. But once you do You will find the game fun and entertaining.
God i see so many noobs here, Blitzs waves can be beaten, If you have very good squad, Not to mention Using Halo version would violate copy right and the 3 is in The age of Metal and Stone tools time if you played this for a while.