Remember that your specific situation will determine which methods you will utilize to lower your consumption,for example:

The square footage & orientation of your roof will affect  feasibility of rooftop solar systems.

Whether your heat is distributed by hot air or hot water is a big factor in picking a heating system.

You are in a single family with lots of land or live in a three-family building on a very tight site.

A roof or siding that’s ready for replacement could impact you insulation choices.