retail electrical and other energy services for commercial, industrial, institutional, municipal and residential customers directed to the design, construction, installation, energy efficiency auditing, financing and maintenance of electrical systems, particularly traditional electrical systems, lighting retrofits, HVAC systems, fuel cell and solar electrical systems; consumer energy products, particularly billing and and pricing products for delivery of blocks of energy at fixed prices and for budget billing, meter and usage controls, energy efficiency systems, and energy producing products such as fuel cells and solar cell applications for retail and wholesale markets