In 2018, sales of electric cars there outpaced the rest of the world combined. Yet, with more than 486 homegrown electric vehicle manufacturers vying for market share and in-flux of foreign companies ready to grab customers, concern is rising that too many manufacturers are churning out cars for nonexistent demand, according to Bloomberg. When the bubble bursts, only a few companies will survive.

"We are going to see great waves sweeping away sand in the EV industry,'' said Thomas Fang, a partner and strategy consultant at Roland Berger in Shanghai, as Bloomberg reported. "It is a critical moment that will decide life or death for EV startups.''

However, China's goal of having annual sales of 7 million new-energy vehicles by 2025 would barely sustain a few companies, not the hundreds currently in the industry, according to Bloomberg.

The massive growth potential drew investors not only from traditional car markers, but also from companies not known for building cars, such as internet startups, electronics companies and real-estate developers. Two dozen of those companies will show off their vehicles at the Shanghai auto show alongside Renault, Audi, Buick, Volkswagen and several other companies trying to make headway in the Chinese market, according to the automotive journal Overdrive.

"Only companies that have solid technology reserves can stand out amid competition,'" said Wang Chuanfu, founder and chairman of BYD, as reported by Bloomberg. "By owning core technologies, we can see further and deeper.''

The ones facing the biggest risk are the upstarts still seeking their footing. Many are founded or funded by people with an internet or technology background, used to hefty cash-burn rates but still not necessarily fully aware of the massive investment needed for car manufacturing, Roland Berger's Fang said, according to Bloomberg.

The dangers of creating oversupply were evident in March when an electric car "graveyard" was photographed on the outskirts of Hangzhou. Thousands of electric cars divided into three sections sit idle in the photographs. The cars belong to Microcity, a ride-sharing company. Yet ride-sharing companies, which have bought heavily into the electric vehicle market, have faced a tough road. Several folded in 2018 and the state media, CCTV, questioned not only the business model, but also whether the companies add to congestion by putting more cars on the road, according to Abacus News.