Created by the California Legislature, SOMAH’s goal is to reduce greenhouse gas emissions

History

Assembly Bill (AB) 693 (Eggman), Stats. 2015, Chapter 582, created the Multifamily Affordable Housing Solar Roofs Program, funded at up to $100 million annually from the investor-owned utilities’ share of greenhouse gas (GHG) auction proceeds.

Senate Bill 92, adopted with the 2017-2018 State Budget, further clarified the budget for the program. Decision 17-12-022 (December 14, 2017) implemented AB 693 and changed the name of the program to the Solar on Multifamily Affordable Housing (SOMAH) Program to distinguish it from other states’ clean energy and low-income solar programs. Decision 17-12-022 established the program’s budget, incentive structure and eligibility policies, among other items.

The SOMAH Program builds on California’s successful Multifamily Affordable Solar Housing program, which helped install over 57 megawatts (MW) of solar PV during 2009-21. SOMAH is jointly administered by the Association for Energy Affordability, Center for Sustainable Energy and GRID Alternatives in collaboration with California Housing Partnership. The program is overseen by the California Public Utilities Commission.

US capitol

Collections and Funding Status

The SOMAH Program serves utility and community choice aggregator customers in the territories of Pacific Gas and Electric Company, Southern California Edison Company, San Diego Gas & Electric Company, Liberty Utilities Company and PacifiCorp.

Funded through greenhouse gas allowance auction proceeds, SOMAH has a program budget of up to $100 million annually and an overall target to install 300 MW of generating capacity by 2032.

Annual collections were authorized starting June 2016 and continue through June 2026 from the California Climate Investments initiative. Funds originate from Cap-and-Trade Program auction proceeds deposited in the Greenhouse Gas Reduction Fund and used to further the state’s objectives to decarbonize and curb climate change.

Funds for each utility territory are released at different times. Collections for each funding cycle are expected to be available between December and February for SDG&E and SCE, between March and May for Liberty and quarterly for PG&E and PacifiCorp. Collections are based on each utility’s Energy Resource Recovery Account (ERRA) or Energy Cost Adjustment Clause (ECAC). For budget information and current available funding, visit California Distributed Generation Statistics.

Collections and Funding Records

Total Collections

IOU 2016 2017 2018 2019 True-Up 2020 2021 2022 2023 2024 2025 TOTAL per IOU
PG&E $1,934,435 $4,843,456 $43,700,000 $37,737,000 $35,133,983 $38,776,228 $31,609,200 $46,222,340 $42,666,697 $28,164,771  $14,747,678 $325,535,788
SCE $3,036,945 $5,040,055 $46,000,000 $33,979,418 $50,602,879 $22,678,768 $63,966,285 $73,364,564 $48,710,716 $27,935,638 $50,209,000 $425,524,268
SDG&E $ - $ - $10,300,000 $10,115,640 $12,604,205 $11,438,841 $10,923,507 $20,583,076 $14,949,939 $4,773,766 $13,630,635 $109,319,609
Pacific Corp $469,381 $1,068,101 $1,121,680 $1,278,364 $ - $1,308,215 $1,211,480 $1,680,958 $1,784,879  $1,851,192 $   380,469 $12,154,719
Liberty $147,156 $287,032 $349,673 $466,130 $   - $362,585 $333,475 $446,231 $332,411 $   - $   - $2,724,693
Annual Totals $5,587,917 $11,238,644 $101,471,353 $83,576,552 $98,341,067 $74,564,637 $108,043,947 $142,297,169 $108,444,642 $62,725,367 $78,967,782 $875,259,077
Admin $558,792 $1,123,864 $10,147,135 $8,357,655 $9,834,106.70 $7,456,464 $10,804,395 $14,229,717 $10,844,464 $6,272,537 $7,896,778 $87,525,908

Incentive Budgets (90% of Total Collections)

IOU 2016 2017 2018 2019 True-Up 2020 2021 2022 2023 2024 2025 TOTAL per IOU
PG&E $1,740,992 $4,359,110 $39,330,000 $33,963,300 $31,620,584 $34,898,605 $28,448,281 $41,600,106 $38,400,027 $25,348,294 $13,272,910 $292,982,209
SCE $2,733,251 $4,536,050 $41,400,000 $30,581,476 $45,542,591 $20,410,891 $57,569,657 $66,028,108 $43,839,644 $25,142,074 $45,188,100 $382,971,842
SDG&E $  - $   - $9,270,000 $9,104,076 $11,343,785 $10,294,957 $9,831,156 $18,524,768 $13,454,945 $4,296,389 $12,267,572 $98,387,648
PacifiCorp $422,443 $961,291 $1,009,512 $1,150,528 $   - $1,177,394 $1,090,332 $1,512,862 $1,606,391  $1,666,073 $   342,422 $10,939,248
Liberty $132,440 $258,329 $314,706 $419,517 $   - $326,327 $300,128 $401,608 $299,170 $   - $   - $2,452,225
Annual Totals $5,029,126 $10,114,780 $91,324,218 $75,218,897 $88,506,960 $67,108,174 $97,239,554 $128,067,452 $97,600,177 $56,452,830 $71,071,004 $787,733,172

Liberty Utilities Company Collections

*Liberty Q1 - Q2 2020 funding was based on quarterly GHG revenue forecasted funds
**Liberty Q3 - Q4 2020 Set-Aside was based on the GHG revenue forecasted funds and was released in Q2 2021.
***Liberty 2021 Set-Aside was based on the GHG revenue forecasted funds and was released in Q2 2021.
Decision Set-Aside or True-Up Actual Set-Aside Calendar Year ECAC Forecast Actual Set-Aside per Calendar Year
D.20-05-024

2016 Set-Aside

$147,156

2016

$147,156
D.20-05-024

2017 Set-Aside

$287,032

2017

$287,032
D.20-05-024

2018 Set-Aside

$349,673

2018

$349,673
D.20-05-044

2019 Set-Aside

$466,130

2019

$466,130
D.20-05-044

2016-2019 True-Up

$ -

Under Collections True-Up 2016-19

$  -

D.20-05-044

D.20-05-044

Q1-Q2 2020 Set-Aside*

Q3-Q4 2020 Set-Aside**

$164,842

$197,743

2020

$362,585
D.21-05-005

2021 Set-Aside***

$333,475

2021

$333,475

D.22-09-013

D.22-09-013

Q4 2020 True Up

2022 Set-Aside

$9,079

$437,152 

 2022 $446,231 

D.24-02-021

D.24-02-021

2022 True Up

2023 Set-Aside

$(67,560)

$399,971

 2023 $332,411
      2024  
Total Liberty Utilities Company Collections

$2,724,693

PacifiCorp Company Collections

*PacifiCorp Q1 - Q2 2020 funding was based on quarterly GHG revenue actuals.
**PacifiCorp Q3 - Q4 2020 funding was based on quarterly GHG revenue actuals and was released in Q2 2021.
***PacifiCorp 2021 Set-Aside was based on the GHG revenue forecasted funds and was released quarterly.
  Set-Aside or True-Up Actual Set-Aside Calendar Year ECAC Forecast Actual Set-Aside per Calendar Year
D.20-05-011

2016 Set-Aside

$469,381

2016

$469,381
D.20-05-011

2017 Set-Aside

$1,068,101

2017

$1,068,101
D.20-05-011

2018 Set-Aside

$1,121,680

2018

$1,121,680
D.20-05-011

2019 Set-Aside

$1,278,364

2019

$1,278,364
D.20-05-011

2016-2019 True-Up

$    -

Under Collections True-Up 2016-19

$    -

D.20-05-011

D.21-03-007

Q1 2021 Set-Aside*

Q3-Q4 2020 Set-Aside**

$607,264

$700,951

2020

$1,308,215

D.21-03-007

D.21-03-007

D.21-03-007

D.21-03-007

Q1 2021 Set-Aside***

Q2 2021 Set-Aside

Q3 2021 Set-Aside

Q4 2021 Set-Aside

$244,604

$258,346

$320,184

$388,346

2021

$1,211,480

D.23-03-008

D.22-03-014

D.22-03-014

D.22-03-014

D.22-03-014

2021 True-Up

Q1 2022 Set Aside

Q2 2022 Set-Aside

Q3 2022 Set-Aside

Q4 2022 Set-Aside

$124,644

$398,652

$421,902

$369,249

$366,511

 2022 $1,680,958
D.23-03-008

Q1 2023 Set-Aside

Q2 2023 Set-Aside

Q3 2023 Set-Aside

Q4 2023 Set-Aside

$376,267

$409,773

$475,570

$523,269

 2023 $1,784,879
D.24-03-011
 

Q1 2024 Set-Aside

Q2 2024 Set-Aside

Q3 2024 Set-Aside

Q4 2024 Set-Aside

$548,538

$486,276

$397,218

$419,160

 2024 $1,851,192
D.25-03-007

Q1 2025 Set-Aside

$380,469

2025

$380,469
Total PacifiCorp Company Collections

$12,154,719

Pacific Gas & Electric Collections

*PG&E Q1 - Q2 2020 funding was based on quarterly GHG revenue actuals.
**PG&E Q3 - Q4 funding was based on the GHG revenue forecasted funds and was released in Q1 2021.
***PG&E 2021 Set-Aside was based on the GHG revenue forecasted funds and was released quarterly.
CPUC Decision Number Set-Aside or True-Up Actual Set-Aside Calendar Year ERRA Forecast Actual Set-Aside per Calendar Year
D.20-02-047

2016 Set-Aside

$1,934,435

2016

$1,934,435
D.20-02-047

2017 Set-Aside

$4,843,456

2017

$4,843,456
D.20-02-047

2018 Set-Aside

$43,700,000

2018

$43,700,000
D.20-02-047

2019 Set-Aside

$37,737,000

2019

$37,737,000
D.20-02-047

2016-2019 True-Up

$30,685,041

Under Collections True-Up

$30,685,041

D.20-02-047

D.20-02-047

D.20-12-038

Q1 2021 Set-Aside*

Q3-Q4 2020 Set-Aside**

Q1 2021 Set-Aside***

$10,117,261

$7,795,632

$20,863,335

2020

$38,776,228
D.20-12-038

Q2 2021 Set-Aside

$4,448,942

Under Collections True-Up

$4,448,942

D.20-12-038

D.20-12-038

D.20-12-038

D.20-12-038

Q3 2021 Set-Aside

Q4 2021 Set-Aside

2016-2019 True-Up

Q1 2021 Set-Aside*

$7,902,300

$7,902,300

$7,902,300

$7,902,300

2021

$31,609,200

D.22-02-002

D.22-02-002

D.22-02-002

D.22-02-002

D.22-02-002

2020 True-Up

Q1 2022 Set-Aside***

Q2 2022 Set-Aside

Q3 2022 Set-Aside

Q4 2022 Set-Aside

$ (186,832)

$11,602,293

$11,602,293

$11,602,293

$11,602,293

 2022 $46,222,340

D.22-12-044

D.22-12-044

D.22-12-044

D.22-12-044

Q1 2023 Set-Aside

Q2 2023 Set-Aside

Q3 2023 Set-Aside

Q4 2023 Set-Aside

$9,939,345

$9,939,345

$9,939,345

$9,939,345

 2023 $42,666,697

D.23-12-022

D.23-12-022

D.23-12-022

D.23-12-022

D.23-12-022

2022 True-Up

Q1 2024 Set-Aside

Q2 2024 Set-Aside

Q3 2024 Set-Aside

Q4 2024 Set-Aside

$(11,592,609)

$9,939,345

$9,939,345

$9,939,345

$9,939,345

 2024 $28,164,771

D.24-12-038

D.23-12-038

D.24-12-038

2023 True-Up

Q1 2025 Set-Aside

Q2 2025 Set-Aside

$(5,131,012)

$9,939,345

$9,939,345

2025

$14,747,678
Total PG&E Collections

$315,596,443

San Diego Gas & Electric Collections

*SDG&E Q1 - Q2 2020 funding was based on quarterly GHG revenue forecasted funds.
**SDG&E Q3 - Q4 2020 Set-Aside was based on the GHG revenue forecasted funds and was released in Q1 2021.
***SDG&E 2021 Set-Aside was based on the GHG revenue forecasted funds and was released in Q1 2021.
****SDG&E 2022 True-Up Correction was released in Q1 2025.
  Set-Aside or True-Up Actual Set-Aside Calendar Year ERRA Forecast Actual Set-Aside per Calendar Year
D.20-01-005

2016 Set-Aside

$    -

2016

$    -
D.20-01-005

2017 Set-Aside

$    -

2017

$    -
D.17-12-014

2018 Set-Aside

$10,300,000

2018

$10,300,000
D.18-12-016

2019 Set-Aside

$10,115,640

2019

$10,115,640
D.20-01-005

2016-2019 True-Up

$12,604,205

Under Collections True-Up 2016-19

$12,604,205

D.20-01-005

D.21-01-017

Q1-Q2 2020 Set-Aside*

Q3-Q4 2020 Set-Aside**

$5,618,639

$5,820,202

2020

$11,438,841

D.21-01-017

D.21-01-017

D.21-01-017

Q4 2019 True-Up

Q1-Q2 2020 True-Up

2021 Set-Aside***

$100,486

$ (760,623)

$11,583,644

2021

$10,923,507

D.21-12-040

D.21-12-040

Q4 2020 True-Up

2022 Set-Aside

$ (209,026)

$20,792,102

 2022 $20,583,076

D.22-12-042

D.22-12-042

2021 True-Up

2023 Set-Aside

$2,933,967

$12,015,972

 2023 $19,949,939

D.23-12-040

D.23-12-021

2022 True-Up Correction****

2024 Set-Aside

           ($7,242,206)

         $12,015,972

 2024 $4,773,766

D.24-12-040

D.24-12-040

2023 True-Up

2025 Set-Aside

$1,614,663

$12,015,972

 2025 $13,630,635
Total SDG&E Collections

$109,319,609

Southern California Edison Collections

*SCE Q1 – Q2 2020 funding was based on quarterly GHG revenue forecasted funds.
**SCE Q3 – Q4 2020 Set-Aside was based on the GHG revenue forecasted funds and was released in Q1 2021.
***SCE 2021 Set-Aside was based on the GHG revenue forecasted funds and was released in Q1 2021.
  Set-Aside or True-Up Actual Set-Aside Calendar Year ERRA Forecast Actual Set-Aside per Calendar Year
D.15-12-033

2016 Set-Aside

$3,036,945

2016

$3,036,945
D.16-12-054

2017 Set-Aside

$5,040,055

2017

$5,040,055
D.17-12-018

2018 Set-Aside

$46,000,000

2018

$46,000,000

D.19-02-024

D.19-02-024

2018 True-Up

2019 Set-Aside

$(6,874,217)

$40,853,635

2019

$33,979,418
D.20-01-022

2016-2019 True-Up

$50,602,879

Under Collections True-Up

$50,602,879
D.20-01-022

Q1-Q2 2020 Set-Aside*

$22,678,768

2020

$22,678,768

D.20-12-035

D.21-01-035

2019/2020 True-Up

2021 Set-Aside***

$19,290,585

$44,675,700

2021

$63,966,285

D.22-01-003

D.22-01-003

2021 True-Up

2022 Set-Aside

$8,291,433

$65,073,131

 2022 $73,364,564

D.22-12-012

D.22-12-012

2023 Set-Aside

2022 True-Up

$46,527,856

$2,182,860

 2023 $48,710,716

D.23-11-094

D.23-11-094

Final 2023 True-Up

2024 Set-Aside

$(18,592,218)

$46,527,856

 2024 $27,935,638

D.24-12-039

D.24-12-039

2024 True-Up

2025 Set-Aside

$3,681,000

$46,528,000

 2025 $50,209,000
Total SCE Collections

$425,524,268

Program Status by Utility

Utility Status Funding last released
Liberty Utilities

Open to applications

June 2024
PacifiCorp

Open to applications

April 2025
PG&E

Open to applications

June 2025
SCE

Open to applications

March 2025
SDG&E

Open to applications

March 2025