Tesla plans to offer a $30 monthly subscription for unlimited overnight home charging. It will launch in Texas because the windy nights help generate power.

• Elon Musk's Tesla plans to offer unlimited overnight home charging for $30 per month to Texans.

• Texas has a lot of wind at night, which serves as energy, Drew Baglino said at Tesla's Investor Day.

• The $30 monthly subscription comes as part of Tesla Electric.

Tesla on Wednesday announced plans to roll out unlimited overnight home charging to customers in Texas for $30 per month.

Drew Baglino, Tesla's senior vice president of engineering, said during the company's Investor Day that customers in Texas would be offered the retail electricity plan in July as part of "Tesla Electric," which provides sustainable energy to homes.

"This is part of reducing the total cost of ownership of our vehicles and the reason why we can do this is because Texas has a ton of wind. And in Texas, the wind blows at night," Baglino said.

Last year, Texas generated the most wind power compared with all other US states, according to a February report by nonprofit news organization Climate Central.