Shareholders of electric car and solar-panel maker Tesla Inc. have approved an ambitious pay package for CEO Elon Musk that could net him more than $50 billion if he meets lofty milestones over the next decade, according to a person briefed on the vote.

The person, who did not want to be identified because official vote results have not been released yet, says the approval was by a large margin. Final totals are expected later Wednesday in a filing with the U.S. Securities and Exchange Commission.

Tesla says the all-or-nothing package is worth $2.6 billion at current stock values, but that would rise dramatically if Musk meets 12 incremental goals including raising the company's market capitalization tenfold to $650 billion. Also included are targets to increase adjusted pretax income and revenue.

If the goals are reached, Tesla would be fourth-most-valuable U.S. company, and Musk would be among the richest people in the world.

Two firms that evaluate proxies for investors recommended that shareholders vote against the pay plan, which they say is unprecedented in size for a U.S. public company. The firms, Institutional Shareholder Services and Glass Lewis, both peg the current value of Musk's package at $3.7 billion. Tesla has yet to turn a full-year net profit even though it's been in business for 15 years.

At least two large shareholders and Tesla's board supported the plan, saying it's necessary to keep Musk in the fold and reach the goal of switching the world from burning oil for transportation to sustainable electric vehicles.

"We believe as a board and executive team that we can actually achieve these milestones," said board member Antonio Gracias, who points out that under a 2012 incentive package, Musk raised Tesla's market capitalization by 17 times to more than $50 billion last year.

FILE- In this Feb. 6, 2018, file photo, Elon Musk,...

FILE- In this Feb. 6, 2018, file photo, Elon Musk, founder, CEO of SpaceX and CEO of Tesla Inc., speaks at a news conference after the Falcon 9 SpaceX heavy rocket launched successfully from the Kennedy Space Center in Cape Canaveral, Fla. Shareholders of electric car and solar panel maker Tesla Inc. are voting on a pay package for Musk that could net him more than $50 billion if he meets lofty milestones over the next decade that include raising the company's market value tenfold. (AP Photo/John Raoux, File) Credit: AP/John Raoux

For each of 12 milestones Tesla achieves, Musk, who already owns more than 20 percent of the company, will get stock worth 1 percent of Tesla. "The shareholders get 99 percent, Elon gets 1 percent," Gracias said.

To get there, Musk will have to expand Tesla's product lineup to include previously announced semis, a new SUV and a pickup truck. Plus the company's solar roofs will have to be successfully integrated into its energy storage business.

There's also the issue of production delays, which have occurred on all of Tesla's current vehicles.

Gracias says shareholders realize that Tesla is often optimistic about hitting production milestones and is working hard to achieve them: "Sometimes the application of engineering takes longer than we think."

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