Making sense of the alphabet soup of charges on a monthly power bill is challenge enough. But there’s a surprising cost baked into customers’ bills that doesn’t have its own line item.

A portion of each payment goes directly in the pockets of shareholders. Called a “return on equity,” the amount is meant to compensate investor-owned utilities for the risk of doing business. It pays back shareholders for their investment in the companies and helps utilities maintain a higher credit rating to attract better loan rates for future projects.

Each state’s utility regulator, including the California Public Utilities Commission, is responsible for determining these often double digit rates of return, which is a key part of utilities’ profits. Studies found that the shareholder rates regularly outpace a common economic benchmark, costing customers across the country as much as $7 billion annually. CalMatters examined these rates since 2020 and found they amount to hundreds of millions of dollars annually from California customers.

Approved rates of return in the state are hovering around 10%, more than double the rate for the benchmark, 10-year U.S. treasury bonds. Utilities can earn less than that if they do not meet performance targets, but California’s three major investor-owned utilities still earned hundreds of millions of dollars from return on equity in 2023. Critics call that excessive and say utilities are exaggerating the risks they face.

“Across all the utilities, we seem to be providing some rather generous rates,“ said David Rode, a Carnegie Mellon University professor who studies decision making in finance and utilities. “It’s easy to look at a single utility and go, ‘well this rate makes sense for this utility’ and miss the broader implications(but)… It’s kind of like missing the forest for the trees.”

Customers across the state are facing steep power bills from the state’s three main investor-owned power companies. Californians pay among the highest electricity rates in the country, the largest portions of which come from new hikes for wildfire mitigation and rooftop solar programs. PG&E bills in particular have risen several times in the last year alone, and ratepayers will see another increase after regulators voted to keep the Diablo Canyon nuclear power plant open to address concerns over energy reliability during the shift to renewable sources.

Gov. Gavin Newsom announced an executive order last fall to address high energy bills by asking the utilities commission to scrutinize wildfire mitigation costs and underperforming energy programs. The state Legislative Analyst’s Office released a report this month examining the state’s climate policies and residential electricity rates, which it found were increased by efforts to curb wildfires and global warming, among other factors.

Southern California Edison’s 2024 approved shareholder return rate was the highest among its Golden State peers at 10.75%, followed by PG&E at 10.7%, and San Diego Gas & Electric at 10.65%.

The utility commission’s preliminary decisions for return on equity rates this year, which have not been finalized, are all just above 10%. That’s comparable to the industry average, also about 10%.

Each company’s financial performance throughout the year determines whether they will achieve their full shareholder rate of return or even above it. But even a fraction of their approved shareholder rates represents millions of dollars from ratepayers. In 2023, for example. Southern California Edison collected $91 million out of a possible $198 million for shareholders (approved for 10.05%), PG&E collected more than $111 million out of a potential $125 million (approved for 10%), and San Diego Gas & Electric collected $41.9 million out of a possible $42 million (approved for 9.95%).

“A competitive return on equity is important to ensure that PG&E can continue to attract the level of investment needed to meet the energy needs of our hometowns,” PG&E spokesperson Mike Gazda said. “The state regulator determines that return on equity through an open, transparent and public process.”

Gazda said the “vast majority” of PG&E’s profits, to which the return on equity contributes, is reinvested into the utility. The company, he said, has cut expenses to customers through federal loans and grants, as well as “new technologies, improved processes, and renegotiated contracts.” He did not answer a question about whether lower shareholder returns would be part of the company’s future plans.

The shareholder rates as approved by the utility commission have outpaced those for the 10-year treasury bonds, which are often used as a benchmark by researchers because they track inflation and are considered riskless. Riskier businesses tend to earn returns above this, experts said. But Rode’s study and others found that utilities’ shareholder return rates are going up nationally, while the risk the industry faces doesn’t match that increase.

Treasury bond yields are part of the model the California Public Utilities Commission uses when setting these shareholder rates.

“Without capital market funding, necessary grid work would have to be funded immediately in part through the rates customers pay, and this would significantly raise those rates,” Jeff Monford, spokesperson for Southern California Edison, said. “Providing our investors with a competitive (return on equity) is crucial to the success of this model.”

CalMatters looked at California’s three main investor-owned utilities’ shareholder return rates and the average 10-year treasury bond yields from 2006 through November, including the utilities’ actual returns during that period through 2023, the most recent data available.

The average rates for such treasury bonds didn’t break 5% from 2006 through November. Only within the last year have any of California’s three major investor-owned utilities dipped below double digits. California’s gap between the shareholder and treasury rates has closed slightly since 2006, with shareholder rates for the three companies declining between less than 2 percentage points each. Treasury bond rates largely held steady during that period.

Despite this dip, the dollar amount the state’s power companies are authorized to collect for shareholders has increased nearly every year as their customer bases grow and utilities add more costs that can be charged to customers.