You depend on your target group for reaching your aim of saving energy, so you need to find a reason for them to participate. This is easiest by designing your project to meet your target group's needs. We call this a 'bottom-up' approach.
Consider what aspects of your project are ‘fixed’ and what can be changed if your target group or stakeholders have different ideas.
Decide on the balance between 'top-down' and 'bottom-up' elements in your project: where can you adapt your project to your target groups' and stakeholders' needs, and where do you need to stick to your own plans?