For updated information about system average costs, rate base, revenue requirements, rates of return, and more, please see the annual reports to the legislature regarding AB 67 and SB 695, available at:

In an attempt to make electric costs more transparent and to provide more insight into the approved costs in rates, some key historical information, for the three large utilities, has been assembled and is presented in the links below. All dollars are nominal (i.e. they are not adjusted for inflation).

Excel download (updates will be made annually). 


Historical cost data for the small multi-jurisdictional utilities can be found by clicking on the links below.