Alternative energy generating assets, such as solar, piezoelectric, electrostatic and electrodynamic generators and wind turbines in and along the highways can capture and convert otherwise wasted ambient energy, which may provide an opportunity to reduce cost, prepare for future needs and even generate revenue. In this Phase-1 project, a review of technologies for energy harvesting is presented, along with an analysis of possible assets and relevant applications, to indicate how ODOT can benefit from this rapidly expanding and maturing field. Following brief background information framing the nature and relative density of ambient energy sources, general requirements for energy harvesting and principles adapted for this report are introduced. Subsequently, three major tasks for the project are used to analyze the potential and challenges of energy harvesting technologies for ODOT. It is emphasized that energy harvesting within the transportation infrastructure presents new challenges and opportunities, which can be adequately tackled not by a single technology or device but an energy-harvesting ecosystem in which a range of more established as well as up and coming technologies, each of which have unique strengths and particular weaknesses, are integrated side-by-side. Particularly, solar and wind-based devices have a significant lead in power density, installation and operational cost and total energy potential that set them apart from newer, more compact devices that truly benefit from vehicular driven vibrational energy sources such as piezoelectric and linear electromagnetic generators. It is recommended that ODOT continues to invest in energy harvesting technologies in general as they are maturing and expanding rapidly to offer viable energy solutions, especially in hybrid schemes that co-integrates several technologies such as solar, wind and piezoelectric in a complementary fashion. This will not only initiate the learning curve for adaption of energy harvesting toolset, it will also provide data for critical decisions for large-scale projects necessary for smart transportation systems with embedded sensors and self-driving electric vehicles expected to proliferate significantly in the next decade. It is further recommended that ODOT determine intended locations for eventual field testing, since energy harvesting will always require a degree of custom design and a truly effective hybrid solutions will be dependent on intended locations.