Changes to the proposed Sienna Solar project in Lucerne Valley triggered a new scoping comment letter from MBCA about Sienna Solar 2. The proposed site has expanded and poses a wide range of potential harms to quality of life and the desert ecosystem. In a community designated as Severely Disadvantaged, Lucerne Valley residents will be subjected to dust, degraded views, and excessive lighting. Environmental problems likely to arise include degraded air quality, water issues, and harm to wildlife including threatened species. MBCA Directors Pat Flanagan and Brian Hammer have outlined the problems and created detailed maps illustrating the issues in MBCA's Scoping Comments to San Bernardino County’s Land Use Services Department. 

MBCA joined Lucerne Valley homeowners and Mojave Communities Conservation Collaborative in a letter to protest the "relocation" of the Sienna Solar Project in Lucerne Valley. The letter points out to the San Bernardino County Supervisors how the reapplication of the project is not simply a relocation allowed by regulations, but an expansion that violates the County's Renewable Energy Conservation Element, intended to minimize negative effects and optimize benefits to unincorporated communities.