Units 2 and 3 of the San Onofre Nuclear Generating Station (SONGS) were shut down in January 2012. Unit 2 last operated on January 9, 2012, when it was removed from service for a planned refueling and maintenance outage.

Under contract to the National Forest Foundation, Aspen served as an extension to U.S. Forest Service staff to complete the associated field surveys, technical reports, and NEPA documentation for two proposed vegetation treatment projects in the Angeles National Forest.

The California Department of Forestry and Fire Protection (CAL FIRE) proposed to upgrade existing mountaintop telecommunications towers, vaults, and other supporting infrastructure as required to support the State's Public Safety Microwave Network and continue to provide essential emergency communications linkages for CAL FIRE'S fire protection and emergency response command and control throughout the State. On behalf of California Department of General Services (DGS), the CEQA lead agency, Aspen assisted with the environmental permitting and surveys at the following 7 CAL FIRE communications facilities: Sierra Vista in Calaveras; Mount Oso in Stanislaus; Chalk Mountain in Santa Cruz; Pratt Mountain and Mount Pierce in Humboldt; Bunchgrass in Shasta; and Banner Mountain in Nevada Counties. 

The Central Basin Municipal Water District (CBMWD) is undertaking an expansion of their existing recycled water system south of Santa Fe Springs into the City of La Mirada to serve irrigation needs.

Aspen prepared an EIR on behalf of the Port of Long Beach (POLB). Southern California Edison (SCE) proposes to replace a series of transmission towers that cross the Cerritos Channel within the POLB and replace them with taller towers to provide sufficient vertical clearance for safe navigation of larger ships.

San Bernardino County Land Use Services Department has used its RECPG funds to prepare a Renewable Energy and Conservation Element for its General Plan.

Inyo County has used its Renewable Energy and Conservation Planning Grants (RECPG) Program funds to develop a Renew­able Energy General Plan Amendment (REGPA) to include policies for facilitating and locating renewable energy development in the County.

The County of Imperial was the recipient of a California Energy Commission Grant on July 15, 2013, to update the existing “Geothermal/Alternative Energy & Transmission Element” of the General Plan. 

In February 2014, Aspen, as a subcontractor to PMC, prepared the County of San Luis Obispo Renewable Energy Streamlining Program (RESP) Opportunities and Constraints Tech­nical Study (OCTS).

Aspen prepared a Mitigated Negative Declaration for the replacement of the existing Sacramento Mountain tele­com­munications facility with a new enhanced radio communications system at Sawtooth Ridge located 12 miles south-southwest of Needles, California.

Ribost Terminal LLC, DBA World Oil Terminals (World Oil) proposes to construct and operate two new 25,000-barrel internal floating roof petroleum storage tanks within the existing World Oil Terminal within the Northeast Harbor Planning District (District 2) at the Port of Long Beach.

Aspen’s Catherine Elder was a pro bono, independent participant in the 2022-23 North American Energy Standards Board gas-electric harmonization discussions that developed 20 recommendations to prevent a recurrence of adverse electricity and natural gas price and reliability and resiliency impacts experienced during winter storm Uri in February 2022 and Elliot in December 2022.

Aspen prepared two major environmental documents, an EIR and EIS/SEIR, evaluating a proposed crude oil pipeline in southern California.