PG&E Corp., the biggest US power utility, said on Monday it is preparing to file for Chapter 11 bankruptcy for all of its businesses as it faces potentially crushing liabilities linked to catastrophic wildfires in 2017 and 2018.

The company’s shares tumbled 55 percent in early trading.

PG&E faces widespread litigation, government investigations and liabilities that could potentially reach $30 billion, according to the company, accounting for damage from fires last year and in 2017.

PG&E said it planned to file for bankruptcy protection around Jan. 29, and to comply with California law was giving employees a 15-day notice.

PG&E said Sunday its chief executive officer was leaving and being replaced by general counsel John Simon on an interim basis.

The utility holding company said it did not see any impact to electric or natural gas services for its customers as a result of a bankruptcy.

PG&E is reeling from the November Camp fire that swept through the California mountain community of Paradise and killed at least 86 people in the deadliest and most destructive blaze in state history.

PG&E expects the Chapter 11 process will “support the orderly, fair and expeditious resolution of its potential liabilities resulting from the 2017 and 2018 Northern California wildfires.”

PG&E said it is in discussions with lenders about receiving roughly $5.5 billion in debtor-in-possession financing to help it operate while navigating through bankruptcy. It has access to about $1.5 billion in existing cash.

The company’s board decided to oust CEO Geisha Williams and undergo a restructuring at a board meeting over the weekend in San Francisco, according to a source familiar with the matter.

Advisers said they expect it may take up to two years for the company to emerge from bankruptcy.

The company has been under pressure from the California Public Utilities Commission to make operational changes. It said on Jan. 3 it was reviewing its structural options and looking for new directors with safety experience.

Board chairman Richard Kelly said “a Chapter 11 reorganization for both the utility and PG&E Corporation represents the only viable option to address the company’s responsibilities to its stakeholders.”

PG&E serves 5.4 million electric customers and 4.3 million natural gas customers in northern and central California.

By filing for bankruptcy, the company will be able to work with “wildfire victims, customers, employees, creditors, shareholders, the financial community and business partners” in one court-supervised process, it said.