By Nadine Schimroszik and Christoph Steitz

POTSDAM, Germany (Reuters) -Tesla received a conditional go-ahead for its German gigafactory near Berlin on Friday, the state of Brandenburg said, ending months of delay for the 5 billion euro ($5.5 billion) landmark plant.

The gigafactory, which is key to Tesla CEO Elon Musk’s ambitions to vanquish European market leader Volkswagen, was initially supposed to open last summer.

Germany’s largest automaker has the upper hand in Europe, with a 25% share of electric vehicle (EV) sales to Tesla’s 13%.

Brandenburg state premier Dietmar Woidke told a news briefing that the development marked “a big step into the future”, adding that the Tesla plant would be a major industrial and technological driver for Germany and the region.

Around 2,600 of the plant’s expected 12,000 workers have been hired so far, unions said last month, and Tesla is in talks with numerous parts suppliers in the region to source as much as possible locally, lowering waiting times and costs.

Underlining the intense competition facing Tesla, Volkswagen said on Friday it would spend about 2 billion euros on a new factory near its Wolfsburg headquarters to make the Trinity, the first of a new generation of electric vehicles for the German carmaker, with construction due to start next year.

Friday’s 536-page conditional building permit for Tesla does not mean the U.S.-based EV pioneer can start production right away. It must first prove that it fulfils numerous conditions, including in water use and air pollution control.

Only then will Tesla get its long-awaited operating permit and actually start rolling out the 500,000 battery-powered vehicles it wants to produce at the new plant, located in the small community of Gruenheide, each year.

Kickstarting production in Germany means Tesla can deliver its Model Y cars to European customers faster and more cheaply, after meeting orders in Europe from its Shanghai factory in recent months as it awaited approval for the site.

Tesla plans to show that it meets the imposed conditions within the next two weeks, Brandenburg’s environment minister Axel Vogel said, while objections can be filed over the next month.

Tesla’s next challenge will be to scale up production as quickly as possible, which Musk said at a fair on-site in October would take longer than building the factory.

Local environmental groups have long feared that the plant will negatively impact local habitat.

Numerous public consultations, focusing primarily on that aspect, delayed the process, with Musk expressing irritation on multiple occasions over German bureaucracy.

The factory, which Tesla has begun constructing under pre-approval permits, will also include a battery plant capable of generating more than 50 gigawatt hours (GWh) per year – outstripping European competitors.

Batteries for cars produced on-site will initially come from China, Musk said, but he intends to reach volume production at the German battery plant by the end of next year.

($1 = 0.9163 euros)

(Reporting by Nadine Schimroszik, Christoph Steitz, Jan Schwartz and Victoria Waldersee; editing by Kirsti Knolle, Miranda Murray, Louise Heavens and Alexander Smith)