Residential Garage Electrical Upgrade

I need an experienced electrician to upgrade the electrical system in my garage.

Key requirements:
- Installation of an additional sub-panel
- Integration of a Battery Energy Storage System (BESS)
- Setup of a transfer switch

Ideal Skills and Experience:
- Electrical design and installation expertise
- Familiarity with BESS and transfer switch integration
- Knowledge of local electrical codes and regulations

Please provide a detailed proposal with relevant experience.