Study: aging grid and electrification could force new Los Alamos substation, higher rates

Los Alamos County utility staff and consultants told the County Council on Aug. 19 that the local electric distribution system will need significant investment to remain reliable as homes and vehicles electrify. The study, produced for the county by Burns & McDonnell, modeled three adoption scenarios and charted gaps in capacity, aging equipment and likely costs.

“Los Alamos County Department of Public Utilities currently owns a substation here in White Rock, but in Los Alamos we take delivery from a Los Alamos National Labs substation with a contract amount of 20 MVA,” one presenter said, noting the county is approaching that contractual limit and that a recently failing transformer underscored near‑term risk. The study’s high‑adoption scenario could add roughly 44 megawatts of load — more than triple current native load under some projections — which would require large new capacity investments.

The analysis separates the drivers of cost into replacement of aged infrastructure and additional growth from electrification. Presenters said much of the anticipated 30‑year capital need stems from equipment that has passed expected service life, including underground cables and older transformers. They estimated that full household conversions could require service upgrades that, depending on home wiring and panel work, might cost in the neighborhood of $20,000 per residence.

Consultants recommended a suite of responses: improving the county’s power‑flow model with higher‑fidelity engineering tools; implementing volt‑VAR control for new photovoltaic customers to reduce voltage issues; studying utility‑scale battery energy storage to shave peak loads; and planning for an Eastgate substation. County staff said design funding for an Eastgate substation is budgeted and that final siting and timing will depend on updated load projections.

The presenters warned that revenue timing matters: if community adoption of electrification proceeds slowly, increased kilowatt‑hour sales may not materialize quickly enough to pay for new substations and other capital, which would shift costs to ratepayers unless alternative revenues are found or rates are adjusted. By contrast, a rapid adoption scenario would produce higher electricity sales that could help cover capital costs.

Staff also flagged workforce and organizational issues: key utility expertise is retiring, and the study recommends spreading responsibilities across more staff and creating succession and asset‑management plans. Deliveries of new custom‑specification transformers were described as lengthy — new units may take on the order of two years to procure — and used units can be short‑term stopgaps but carry reliability risk.

Councilors asked about coordination with Los Alamos National Laboratory (LANL) and the county’s electric coordination arrangements; staff said the electric coordination agreement with LANL is under negotiation but expected to remain a major source of supply for the townsite. No formal decisions were made at the meeting; staff said next steps would include possible procurement for modeling and discussion of budgeting for further feasibility and design work.

What happens next: staff recommended follow‑on feasibility and planning work and said they would return with refined costs and a timetable if the council wants to proceed into preliminary design and budget requests.