CARSON CITY, Nev. — Calling it one of the most important pieces of legislation in Nevada history, Gov. Brian Sandoval signed into law Thursday night an unprecedented package of incentives to seal a deal to bring Tesla Motors' $5 million battery factory to the Silver State.

The “gigafactory” is expected to bring more than 20,000 jobs and $100 billion to Nevada's economy over the next 20 years. It will be the biggest lithium battery factory in the world and is critical to the electric car maker's plans to begin mass marketing a more affordable line of the vehicles within three years.

One lawmaker said it was the most important development in Nevada since the construction of the Hoover Dam.

“It doesn't get any bigger than this,” Sandoval said as he put his signature to four bills. The package includes incentives worth up to $1.3 billion.

NEW YORK — RadioShack warned Thursday that it may need to file for Chapter 11 bankruptcy reorganization if it can't rework its debt or find another way to ease a cash crunch.The retailer said in a regulatory filing that it is in talks with its lenders, bondholders, shareholders and landlords to fix its balance sheet, but if it can't, it will try to file a prepackaged bankruptcy.RadioShack, based in Fort Worth, Texas, has been working on turning around its business for the past 18 months. Efforts have included cutting costs, closing stores and shuffling management. It reported another quarterly loss on Thursday.