There isn't much information on how Musk, Tesla, SolarCity, and Musk's Rive cousins were involved in the SolarCity Buffalo Billion scandal.
SolarCity was founded by Musk's cousins Peter and Lyndon Rive, on the instructions of Musk.
In 2014, Elon Musk promoted the idea of SolarCity building a solar plant in Buffalo, New York. Construction started in 2014 and was completed in 2017, financed by $750 million and another $500 million subsidy from the New York state.
Tesla acquired SolarCity for over $2 billion in 2016.
The Buffalo Billion plant was a joint venture with Panasonic until early 2020.
In 2009, SolarCity announced a partnership with the Dutch Rabobank.
In March 2018, Cuomo's top aide, Joe Percoco, was convicted of bribery and wire fraud.
In July 2018 - Alain Kaloyeros; Steven Aiello; Joseph Gerardi; and Louis Ciminelli were convicted of rigging bids for state contracts, including Buffalo Billion.
Cuomo's former aide Todd Howe also pleaded guilty to corruption charges relating to COR Development and LPCiminelli.
In November 2013, Louis P. Ciminelli (CEO of LPCiminelli) hosted a fundraiser for Cuomo, 3 weeks before submitting his bid to the Buffalo Billion program. Reportedly Ciminelli personally contributed $96,500 to Cuomo's gubernatorial campaigns