Energy
Solar cells and arrays:

Si, PolySi, and multi-junction technologies
Multi-junction cell fabrication
Concentrated solar arrays
Photovoltaic components and arrays
Heliostat design
Solar project design and cost analysis
Wind and hydro energy
Wind turbine design and technology
Energy harvesting:
Piezoelectric
Ultrasonic
Thermoelectric
Power:
Power distribution and transmission
Smart-grid technologies
Transmission line route selection, design, and siting
Power Electronics:
AC-DC and DC-DC power supplies
Inverters
Uninteruptable Power Supplies (UPS)
Grid matching and anti-islanding
Power Factor Correction
Backup generator systems
Solid State(LED) and HID lighting
Lighting components and systems