The traditional, and extensively used in Brazil, approach to make energy projects happen is for the client to purchase, operate, and maintain the assets involved.
A very interesting alternative to consider is results-based contracting.
Examples:
High-voltage substation
On-site generation
Retrofitting of lighting, motors, etc.
Energy management
Main advantages:
Client focuses on their core business
Experienced contractor brings efficiency to solutions
Faster delivery and results
This is all because the contractor provides technical, financial, legal, and management solutions. The biggest challenge, always, is knowing how to consult the market!
To create solutions that are well-suited to the client's interests and needs. This has been and is my experience in decades of working in this area providing consulting services to clients!