and risks were reduced. Schedule issues Lockheed Martin began construction of the lander on 19 May 2014, with general testing starting on 27 May 2015. A persistent vacuum leak in the CNES-supplied seismometer known as the Seismic Experiment for Interior Structure (SEIS) led NASA to postpone the planned launch in March 2016 to May 2018. When InSight was delayed, the rest of the spacecraft was returned to Lockheed Martin's factory in Colorado for storage, and the Atlas V launch vehicle intended to launch the spacecraft was reassigned to the WorldView-4 mission. On 9 March 2016, NASA officials announced that InSight would be delayed until the 2018 launch window at an estimated cost of US$150 million. The spacecraft was rescheduled to launch on 5 May 2018 for a Mars landing on 26 November 2018 at 20:00 UTC. The flight plan remained unchanged with launch using an Atlas V launch vehicle from Vandenberg Space Force Base in California. NASA's Jet Propulsion Laboratory was tasked with redesigning and building a new vacuum enclosure for the SEIS instrument, while CNES conducted instrument integration and testing. On 22 November 2017, InSight completed testing in a thermal vacuum, also known as TVAC testing, where the spacecraft is put in simulated space conditions with reduced pressure and various thermal loads. On 23 January 2018, after a long storage, its solar panels were once again deployed and tested, and a second silicon chip containing 1.6 million names from the public was added to the lander. Effects of Martian dust and end of operations The InSight lander, powered by solar panels and batteries, relies on periodic wind gusts called "cleaning events" to reduce dust accumulation on the panels. Elysium Planitia, the landing site of InSight, has experienced fewer cleaning events than needed to keep the science operations powered. In February 2021, at the start of the Martian winter, InSight's solar cells were producing 27% of capacity due to a thick covering of dust on the panels. At that time NASA began the process of putting the lander into hibernation mode, shutting down data-gathering instruments on a schedule to conserve enough power to keep the lander electronics warm through the Martian winter. NASA had hoped that weather conditions would improve and allow InSight to store enough energy to come out of hibernation in July 2021. In May 2021, some generation capacity was restored by using the arm to position sand