The City of Los Angeles and its Department of Water and Power (LADWP) is capturing impressive energy and cost savings from recent renovations to its water filtration plant and its own office building.
LADWP is the nation's largest municipally-owned utility, providing water and electric service to approximately four million residents across 500 square miles. Starting in the mid-2000s, LADWP began a comprehensive modernization of its Aqueduct Filtration Plant, with a long-range program to upgrade and replace aging equipment. The latest set of improvements to the Plant focus on replacement of the oxygen plant supporting the ozonation process that improves water taste and appearance. This includes a switch from a cryogenic oxygen system to a pressure swing adsorption system (enabling a down-sizing of the compressor), replacement of flocculation paddle mixers with more energy efficient jet mixers, and upgrades to lighting and HVAC systems in the facility buildings. Once these latest improvements are fully implemented in 2018, the plant is expected to reduce energy use by 15 percent, saving $115,000 in annual energy costs.
The City’s recent upgrades didn't stop at their potable water treatment plant; the department also recently upgraded its own office building – the John Ferraro Building. This included a suite of energy efficiency measures, including fan system retro-commissioning and upgrades, lighting upgrades and controls, duty cycle changes for selected equipment, and chiller replacement. Most measures were implemented throughout 2014 and completed in the first quarter of 2015. As a result of these measures, the John Ferraro Building achieved 37 percent annual energy savings in 2016, leading to annual cost savings of $1,745,000.