Earlier today, Tesla filed their notice with the SEC for their 2015 annual shareholders meeting to be held on June 9th. In these filings, Tesla is required to review transactions with related parties. Elon Musk, CEO of Tesla Motors, is Chairman and an important shareholder of SolarCity. Therefore Tesla needs to publicly acknowledge transactions between the two companies.

Tesla recently confirmed in an email to investors that their announcement on April 30th will indeed be a home battery system and an energy storage system for utilities. It has been known for a while that Tesla was testing these home battery systems through SolarCity. In the same filings last year, the company confirmed approximately $1.6 million in revenue from SolarCity during fiscal year 2013 for the sales of stationary batteries.

Today, Tesla confirmed that the revenue from SolarCity for stationary batteries went up to $2.7 million for the fiscal year 2014.

According to Rod Lache from Deutsche Bank, if SolarCity were to reach their goal of 1 million customers by 2018 and if Tesla would equip half of their customers with home battery systems, Tesla could generate $1.5 billion of revenue through 2018 from SolarCity. Tesla made $3.2 billion in revenue last year.

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