As of October 19, 2021, CUAC has updated utility tariffs and a new user guide (Publication No. CEC-400-2021-011, October 2021). See Section 2.2 of the CUAC User Guide for more information on the user interface (updated in late 2020). If you have trouble viewing or accessing the document files, please contact us.

NOTE: If you are already using CUAC Version 2.0.0 (11/30/20), update only the look up tables to prevent losing your project files.

The CUAC is a tool designed to calculate project-specific utility allowances for low income housing projects. As a result of recommendations from the New Solar Homes Partnership's Affordable Housing Advisory Committee, California Energy Commission (CEC) staff working through its contractor, KEMA, began development of the CUAC in 2007.

The approved energy consumption software model can be used by qualified professionals approved by the California Tax Credit Allocation Committee (CTCAC) to calculate project specific utility allowances.

On January 25, 2009, the CTCAC approved the CUAC as the energy consumption model software for California for the 2009 tax credit funding cycle. The CUAC can be used by qualified professionals approved by the CTCAC to calculate project-specific utility allowances.

The CUAC is intended for affordable housing new construction and possibly substantial rehabilitation projects. Qualified buildings must include energy efficiency improvements and/or have onsite photovoltaic generation (PV) and be built to the  2005 California Building Energy Efficiency Standards or beyond. The CUAC is not appropriate for use with existing projects built to older energy efficiency standards (before 2005) or to projects that do not include energy efficiency or PV upgrades.

The CEC works with state and local housing authorities and funding agencies with regulatory authority over affordable housing projects. Agencies examine the potential use of the CUAC for determining project specific utility allowances that include energy efficiency or PV upgrades, including rules adopted by agencies to assure that the CUAC is used by qualified professionals.

CUAC User Guide (CEC-400-2021-011, 508 KB)

CUAC Lookup Tables (ZIP file, 1.4 KB)
Last updated: October 5, 2021
For current CUAC 2.0.0 users

Downloading Instructions: In C:\CUAC, replace the file CUACTool_LookupTables.accdb (1 KB)

California Utility Allowance Calculator (ZIP file, 3 MB)
Version 2.0.0 (11/30/20)
Last Updated: October 5, 2021

The current version of the CUAC requires a Windows-based PC and Microsoft® Access®. A Macintosh-based version is not expected to be created.

Downloading Instructions: Create a folder in your C drive and name it "CUAC." Right-click the link above to download the file into the "CUAC" folder you've just created on your C drive. Unzip the files from the CUAC zip file (NOTE: if your file structure shows C:\CUAC\CUAC, move the files up one level to c:\CUAC and double click on CUACTool-Rev2-0-0.accdb).

I cannot get the CUAC to start. What could be wrong?
Likely your program is in a subfolder inside another subfolder (unzipping files often creates an additional folder). If windows explorer shows CUAC in C:\CUAC\CUAC, move the files up one level to c:\CUAC. Then double click on CUACTool-Rev2-0-0.accdb.

How can I get my existing projects into the new CUAC?
Click on “Transfer Projects” on the main CUAC screen and follow the instructions.

How do I print the CUAC forms?
All options affecting printing are across the top of the main screen, starting from the right.

  1. Check the selected printer for the device.
  2. Select output as either printer or preview (you cannot print from preview).
  3. Select from SF (submittal signature form), PD (project details), or Both to print.
  4. Press QC Save to complete the quality control process.
  5. Press Draft (Draft and Final are essentially “print” buttons with Final locking all future changes). NOTE: If Adobe PDF is your “Printer” you will need to name both forms. The default names are always the same.

Can I copy data from an existing project into a new project?
Yes. Pick “Start New Project” and give it a unique name. Select QC save. (The quality control part of the program will notify you what data is missing). Then select “Copy to this Project” and identify in the “From” field (using the arrow) the project from which to copy. The program fills in the current project as the “To” .project. Last, pick “Copy Project” and confirm (because if there is any data in this project it will be replaced.

Can I delete an apartment type that is no longer included (e.g., studio) from an existing project?
To remove an apartment type (or installed PV system), find the item to delete, single left-click in the column to the left of the name, press the delete key on your computer keyboard, and confirm the deletion.

Is there a user guide for CUAC? Who can I contact if I have CUAC questions?
There is a new User Guide available. If you have questions that cannot be answered from the “Instructions” included with CUAC, the 2021 user guide, or have other questions about CUAC, send an email to Dee Anne Ross (

Who do I contact if I have questions about the TCAC or CDLAC process?
The California Tax Credit Allocation Committee website includes information about the CUAC program and process at The California Debt Allocation Committee website is


Dee Anne Ross