Elon Musk congratulated Ford on its all-electric Mustang Mach-E SUV, a threat to Tesla

• Ford unveiled the electric $4 on Sunday, a challenger to Tesla.
  
• Tesla CEO Elon Musk tweeted his congratulations to Ford, saying the move would "encourage other carmakers to go electric too."
• Ford, along with other conventional automakers, has been breaking more and more into the electric vehicle market.
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Elon Musk tweeted his welcome to Ford's new electric vehicle, the Mustang Mach-E SUV.

$4 have been breaking into the electric vehicle market, tapping into the market which Tesla has sought to dominate.

Ford $4 with great ceremony - featuring an appearance from actor Idris Elba. The car costs between $43,895 and $60,000, and includes various Tesla-like features such as a front trunk (or "frunk") and keyless activation where owners can start their cars using an app on their smartphone.

Musk responded to the unveiling via his favorite medium of Twitter. "Congratulations on the Mach E! Sustainable/electric cars are the future!! Excited to see this announcement from Ford, as it will encourage other carmakers to go electric too," $4 on Sunday.

This isn't the first big play Ford has made in the electric vehicle market. The company announced in October it was giving electric vehicle owners $4 in North America. Notably Ford's charging points are useable by any vehicle, whereas Tesla's Supercharger network

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