SE-Three is a Multi-Disciplinary Engineering Consulting CompanyWe provide a multitude of services in design, engineering, and management of projects specializing in Environmental Engineering, Sustainability, Renewable Energy, Energy Management and Asset Management.Learn more Our Services Environmental Engineering Asset Management Sustainability Renewable Energy Engineering & Engineering Management IT / Software Services Learn more Most Recent Projects Retaining Wall / Patio Project in DC. Retaining wall project, Maryland. 12 KW Residential Solar PV Project in Elkridge, MD. 10 kW Residential PV Project in Bowie Maryland, being installed 50 kW Commercial Project in Washington DC (NE), Being Installed. 250 kW Commercial Ground Mount Solar PV Project, Texas.