RB Inyokern: AI Campus Fiber and Power Under Review

A proposed AI data center in Inyokern, California, puts two separate fiber networks and a generator-control problem into public view. R&L Capital's RB Inyokern Data Center would bring six data halls to the western Mojave Desert. For low-voltage contractors, the useful detail is in the communications routes, equipment interfaces and review questions that could shape future packages.

As of October 2, 2026, the California Energy Commission project page lists the proposal as under review. The latest substantive staff request reviewed is dated September 25. A campus construction start, tenant commitment, project financing and installation awards remain unverified. This is an early opportunity to understand a proposed build and its constraints.

The proposed campus and its capacity figures

The May 8 application describes approximately 238,000 square feet across six data halls on about 50 acres near US-395 and State Route 178 in unincorporated Kern County. Those headline dimensions follow the main application and CEC summary; an older appendix drawing carries different floor-area and acreage figures.

Item	Reported basis	Qualification
Stage	Proposed; CEC review	No verified construction start
Building	About 238,000 sf; six halls	Applicant design
IT load	About 70 MW	Conflicting wording elsewhere
Facility load	Up to 99 MW	Design demand
Generators	120 MW nameplate	Proposed 99 MW output limit
Investment	Unverified	No defensible trade budget
Schedule	Conditional 2027 start	2029/2031 targets conflict

The main load breakdown assigns roughly 70 MW to IT equipment and 99 MW to the overall facility at full buildout. Section 4.6 also contains a sentence calling 99 MW IT capacity, while its adjoining phased-load table uses 70 MW IT. That inconsistency needs an applicant clarification. Neither number establishes an energized load today.

Backup generation uses another basis: forty generators rated at 3 MW each total 120 MW of nameplate capacity. The applicant proposes limiting their combined output to 99 MW. In its July response, R&L discusses that operating limit and revises an earlier operating assumption. CEC staff still seeks technical evidence showing how the limit would work. Contractors evaluating equipment or testing scope should keep those definitions attached to every capacity number.

Commercial fiber and utility fiber have different jobs

The application's communications section identifies Onward as the proposed commercial fiber provider and references an August 6, 2025 service confirmation letter. It describes Digital 395 as a 432-strand network in three conduits, with north/south route diversity. Onward's own network page supplies broader Digital 395 context. The described backbone configuration does not establish a campus fiber installation award or the number of strands a tenant will receive.

A second communications system belongs to Southern California Edison. The proposed SCE routes would use 48-strand single-mode fiber for protection and control between the existing Inyokern Substation and the project point of interconnection. The applicant gives approximate route lengths of 3,200 feet and 8,250 feet, with separate alignments for redundancy. These routes are independent of Onward's commercial network.

That separation changes the questions a contractor should ask. Commercial connectivity requires carrier handoff, entrance, pathway and service-boundary information. Utility protection communications require the utility's approved equipment interfaces, testing procedures and acceptance responsibilities. Treating all those feet and fibers as one campus cabling package would obscure who buys the work and who accepts it.

September staff questions also request geospatial information for the utility fiber routes, subtransmission lines, substation expansion, site boundary and staging areas. Final engineering and route permissions remain consequential. Upstream carriers named in the application describe network interconnections; the reviewed evidence does not establish them as campus tenants or direct construction partners.

The 99 MW limit creates a controls and commissioning question

In Data Requests Set 2, CEC staff asks for an electrical one-line showing the proposed power-limiting system. Requested detail includes measurement points, protective relays, breaker trip or interlock functions, and connections between generator yards and medium-voltage switchgear. Staff explains that this information is needed to assess the proposed physical generating limit.

For controls and commissioning firms, this is a concrete technical interface to follow. The installation package, responsible integrator and accepted functional-test protocol remain unresolved. A future package could require coordinated work across generator controls, switchgear protection and monitoring, but its procurement scope must come from issued documents.

The application specifies Caterpillar 3516E generators and Johnson Matthey CompactSCRT emissions treatment. Those are design references. Purchase orders and deliveries have not been verified. The applicant describes Tier 2 base engines with external treatment targeting Tier 4-equivalent stack emissions; that should not be presented as factory Tier 4 engine certification. September requests seek additional technical substantiation, including emissions calculations.

Who is named, and what their role actually establishes

The public filings identify a development and review team before they identify a construction procurement team. The application preparer list names R&L Capital, Valley Wide Engineering & Construction and Jun Y Lee LLC. Company capabilities provide context; a project-specific role requires project-specific evidence.

Organization	Verified role	Evidence
R&L Capital	Owner/applicant	Application
Valley Wide	Preparer; project management	Preparer list
Jun Y Lee LLC	SPPE/CEQA preparer	Preparer list
Circle Mountain	Biological consultant	Survey supplement
Southern California Edison	Proposed power/utility fiber	Utility design
Onward	Proposed commercial fiber	Service-letter reference
Inyokern CSD	Conditional water service	Appended letter
McWhirter Steel	Project supporter	Support letter
Caterpillar	Specified generator model	Applicant design
Johnson Matthey	Specified emissions treatment	Staff questions

Valley Wide's website describes its engineering and construction business; its evidenced RBIDC assignment is application preparation and project management. A campus GC award remains unverified. Circle Mountain Biological Consultants has stronger evidence of a specific completed assignment: the September supplement documents its R&L contract and field surveys conducted in July and September. Survey work establishes environmental-consultant activity.

McWhirter Steel submitted a supportive letter, dated May 28 and docketed September 8. It establishes the company's support for the proposal. It does not identify an awarded steel package. The same discipline applies to low-voltage firms: no cabling, security, fire alarm, BMS or commissioning installation award was verified in this review.

Where low voltage could become bid scope

System	Evidence today	Next useful detail
Commercial fiber / OSP	Onward route concept	Campus handoff and installer
Utility fiber	SCE protection routes	Approved routes and acceptance
Power controls	CEC requests limit design	One-line and test protocol
Access / CCTV	Applicant security design	Device schedule and integrator
Structured cabling	Prospective trade scope	Issued layouts and quantities
BMS / fire interfaces	Prospective trade scope	Point lists and package owner

The application explicitly describes controlled access and round-the-clock CCTV. Those statements support watching for security design and procurement. They do not establish camera quantities, a selected access-control platform or an integrator. Structured cabling, cooling-monitoring interfaces and life-safety integration are prospective LVN analysis based on the facility type; issued specifications must establish the actual packages.

A useful early contractor capability statement would explain fiber splicing and testing, pathway coordination, labeling, equipment integration and turnover documentation. It should separate commercial IT experience from utility or operational-technology experience. A shared location does not automatically create shared procurement, access rules or commissioning authority.

Jobs, trades and preparation

The applicant forecasts approximately 300 average and 600 peak construction workers, plus 30–60 permanent employees. September staff requests confirm that the 600-worker peak excludes SCE's subtransmission, utility fiber and substation workforce. The total combined construction peak therefore remains unresolved. These are planning forecasts, with no verified active hiring total or executed project labor agreement.

Potential work spans civil pathways, electrical coordination, single-mode fiber, security, controls and commissioning. General preparation can include FOA workforce training and BICSI communications training. Practical capabilities include clean fiber inspection, splicing, loss testing, OTDR records, route documentation, grounding and bonding coordination, and accurate as-built labeling. These are preparation areas, not published RBIDC credential requirements.

OSHA Outreach training provides general hazard-awareness education. Employer and site onboarding requirements would still need verification. Entry-level workers can build pathway, labeling and documentation skills under supervision; experienced technicians can prepare to handle testing, system integration and witnessed turnover. A forecast employment number should never be presented as an available vacancy.

Water, permissions and timing remain material

Indian Wells Valley Water District's August comments question the applicant's water-demand and supply assumptions. The filing includes a conditional April 2 will-serve letter from Inyokern Community Services District. These are separate agencies. The commenting district's concerns are attributed positions, while water-service and annexation questions remain unresolved; the record reviewed does not justify calling water secured.

The applicant proposes construction in 2027 after required approvals. Its narrative describes approximately 48 months and full operation in 2031, while Table 1-2 lists 2029. Temporary 20 MW service in mid-2028 is being evaluated. Those statements need reconciliation before a contractor relies on a mobilization or occupancy date. A CEC exemption decision would also leave other applicable permissions to be addressed.

The public docket is the next place to watch for revised engineering, staff analysis and applicant responses. The most useful milestones are an accepted power-limit design, clarified utility and water arrangements, aligned construction dates, and identifiable procurement contacts or bid packages. Project financing, tenant commitment and overall construction value still need evidence.

Research the opportunity in LVN Signal

RB Inyokern offers unusually specific early clues about commercial connectivity and utility communications. Its value to contractors is the ability to understand those interfaces while the project is still in review. A bid decision should follow clearer scope, approvals and purchasing responsibility.

Use LVN Signal to research construction projects, named organizations and low-voltage opportunities. For this campus, the map uses an Inyokern locality marker until a precise site point is verified. Read the sources, identify the package owner and verify the current stage before committing estimating time.

Featured and social artwork are AI concept illustrations, not photographs or an approved campus rendering. Reporting checked October 2, 2026.