District staff report solar gains, IRA rebates and debate costly ground‑source heat pump options

Salt Lake City School District staff briefed the board on Oct. 7 about the status of district sustainability projects, including solar photovoltaic (PV) arrays, weatherization work, utility‑rate negotiations and the technical and cost tradeoffs of ground‑source (geothermal) heat pumps.

Morgan McMillan, the district’s energy and sustainability manager, said several PV arrays installed in fiscal 2025 exceeded production expectations once warranty repairs (a failed fuse at one site) were completed. McMillan said the solar projects and weatherization measures are producing measurable utility savings, and she reported fiscal‑year 2025 savings from PV and weatherization work.

Executive director of facilities Isaac Gastill and McMillan described larger capital choices ahead. Ground‑source heat pumps offer substantial long‑term operational savings and low maintenance, Gastill said, but are expensive to install at retrofit sites and can have very long simple payback periods unless co‑funded with rooftop solar and incentive programs. Gastill said two candidate elementary projects on the bond list showed dramatically different paybacks because of site geology and drilling depth: one site’s ground‑source option was substantially more expensive because deeper drilling was required.

McMillan said the district has been pursuing federal Inflation Reduction Act (IRA) tax credits and other rebates: she said the district recently received a $1.2 million IRA payment tied to phase 1 of the work and estimated about $2 million for phase 2, plus utility rebates from Rocky Mountain Power and others. She also said the University of Utah received an EPA grant and the district is receiving air‑quality monitors and high‑efficiency HVAC filters through that grant.

Gastill recommended a pragmatic approach on two bond‑listed projects: pursue high‑efficiency mechanical replacements at Ensign Elementary rather than costly ground‑source systems because cost‑to‑benefit and roof/age factors make the geothermal option less feasible there; at Whittier Elementary (which already has some rooftop PV), additional solar plus electrification could be more attractive. Gastill also identified a multi‑year effort to separate culinary and irrigation meters at roughly 20 sites to avoid a new municipal “flow” charge on drinking‑water use tied to sewer calculations; he said the municipal fee reversal program requires physical separation and estimated $50,000–$75,000 per site for meter separation and roughly a half‑million dollars total phased over multiple years.

Board members asked for clearer long‑range facilities and sustainability cost projections; Gastill said facilities staff will provide a book of building assessments and an initial table of contents for a comprehensive facilities plan and recommended that the board consider a study session to examine how sustainability goals and capital planning intersect.

Ending — What’s next

Staff will provide a facilities table of contents to the superintendent and board this month, continue IRA/rebate processing, complete the seasonal performance review of solar installs and prepare a study‑session briefing on sustainability tradeoffs and long‑range facilities planning.