Elon Musk, CEO of Tesla, has used Twitter to hint at a big announcement for the Silicon Valley brand, saying he hopes to publish part two of his “Top Secret Tesla Masterplan” this week.

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The tweet, which reads “Working on Top Secret Tesla Masterplan, Part 2. Hoping to publish later this week”, comes amid a dark cloud that has hovered over the brand over the last few weeks.

Over past fortnight there have been inquiries into two Tesla crashes, one of which ended in a fatality. The company’s AutoPilot autonomous technology has been called into question, after the first fatal crash was found to have the system engaged at the time of the incident.

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Above: Tesla's AutoPilot beta technology

Despite recent events, the company is standing by its products, and it seems that the CEO is soldiering on with even grander plans for the Silicon Valley-based automotive firm.

Since Musk’s original “Secret Tesla Motors Master Plan”, which he published in 2006, the company has gone on to achieve almost all of the objectives that he set out a decade ago.

An "in short" version of the original plan, posed somewhat tongue-in-cheek although clearly genuine, read as follows:

“Build sports car

Use that money to build an affordable car

Use that money to build an even more affordable car

While doing above, also provide zero emission electric power generation options

Don't tell anyone”

In 2006 the company debuted the Tesla Roadster - which was based on the Lotus Elise - and could sprint from 0-100km/h in less than four seconds with no fuel and no emissions.

However, the Roadster was quite expensive, retailing in Australia for around $200,000 - not an unusual price for a Tesla these days, but astounding for a brand that was, at the time, a relative unknown.

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Above: Tesla Model S

Fast-forward to 2012, and Tesla would create the Model S, a full-sized all-electric luxury family car. Starting at half the price of the Roadster, but just as quick, the model S brought silent EV motoring to the masses, even with its luxury car price tag.

Now in 2016, the Silicon Valley-based manufacturer recently revealed its “even more affordable car” - the Model 3.

The BMW 3 Series-sized EV builds on the Model S formula, being a practical five-seat sedan, equipped with sports car performance, while using no fuel and producing zero emissions. All this for a starting price of US$35,000 - in Australia it’s likely to be closer to $60,000.

Adding to the range, the Model X SUV combines supercar-beating acceleration with emissionless transport and seven-seat practicality.

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Above: Tesla Model 3

The next step in Tesla’s grand plan would be to provide a completely emissionless energy cycle, considering much of the world’s electricity is still generated from fossil fuels - negating the clean dream that is Tesla motoring.

Musk is already chairman of SolarCity, a rooftop solar panel company run by his cousins, Lyndon and Peter Rive.

Tesla's boss has already revealed a proposal for the car maker to acquire the solar energy firm, which could see the companies create a vertically integrated energy business “offering end-to-end clean energy products”.

Driving this initiative is the idea that owners would install roof-mounted solar panels on their homes, which would power their household along with their Tesla vehicle - an emissions-free energy cycle.

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Above: Tesla's Powerwall

Tesla, however, already offers the Powerwall, a battery pack for homes which charges using solar panels and powers the household at night time to save on electricity costs.

The next masterplan could be looking another ten years into the future, so we will have to wait and see until Musk publishes his next grand scheme - hopefully by the end of this week - for the world to see.

What do you think Tesla has planned next? Let us know in the comments below