With funding from the CEC, CALSTART partnered with the Los Angeles Department of Transportation and BYD Motors to deploy and demonstrate four battery electric transit buses in revenue service in downtown Los Angeles, California. This study collected over twelve months of data from October 2017 to November 2018, and examined the buses on measures of performance, maintenance, as well as cost of ownership and operation. It also compared these measures between the electric buses and Los Angeles Department of Transportation’s compressed natural gas buses. This study found that the four electric buses outperformed the compressed natural gas buses in efficiency, operating costs (including fuel costs and maintenance costs), emissions, and fuel consumption. Also, while the cost of the electric buses was higher than the compressed natural gas buses, Los Angeles Department of Transportation’s four electric buses had operating costs that were about one-third of the compressed natural gas buses. This was partly due to two reasons: Los Angeles Department of Transportation’s favorable overnight depot charging at low base rates with no demand charges, and a maintenance warranty placed on the electric buses by BYD Motors. With these operating cost savings, Los Angeles Department of Transportation can expect a simple payback period on the premium of the electric bus price in about 10 years, and less than eight years at BYD Motors’ current, lower price for the same bus, both within the typical service life of a transit bus of 12 years. With respect to maintenance, while the electric buses outperformed the compressed natural gas buses in terms of cost, one of the buses did experience two recurring issues that put it out of service for a significant amount of time: a faulty charger cooling system and a damaged battery pack cover causing water damage to the battery. Additionally, the buses were under warranty by BYD Motors, lowering the actual maintenance costs incurred by Los Angeles Department of Transportation. Importantly, this study was limited to the operations of only four electric buses. Los Angeles Department of Transportation and other transit fleets should take scale into consideration as electrifying a larger number of buses will likely change capital and operating costs and will present challenges to other facets of fleet operations including scheduling, charging optimization, electricity demand, and maintenance.