Lewis and Clark County, MT — Solar Development Risk Assessment

No Moratorium

No Montana state-mandated solar setback floor for sub-250 MW facilities. Standard agricultural district setbacks apply (typically ≥25–50 ft from property line, ≥50 ft from road ROW) where no county solar ordinance exists. County-specific setbacks may apply if local ordinance adopted.

Conditional Use Permit (CUP) or Special Use Permit (SUP) in Agricultural (A) or Rural zoning district; administered by county planning board or zoning board of adjustment. Process varies by county; most counties lack solar-specific ordinance.

Helena state capital drives highest institutional solar activity in MT; NorthWestern interconnection queue backlog growing; ag-land concerns emerging

NorthWestern territory; Helena state capital; large state government/healthcare employment base; Lewis & Clark County progressive-leaning commission

Worsening

Sub-250 MW: county-level CUP or SUP in agricultural/rural zone; county planning board or BZA approval; process and timelines vary by county (typically 60–180 days). Facilities ≥250 MW nameplate: Montana Major Facility Siting Act (MCA 75-20) — requires BER siting certificate; full environmental review. MPSC regulates net metering interconnection for qualifying facilities. No state preemption statute; counties retain full authority for sub-250 MW.

Montana: No binding RPS. Voluntary 15% renewable goal (expired 2015). Net metering: available under MPSC rules (≤50 kW residential, up to 5 MW commercial). Property tax exemption: renewable energy systems exempt from state property tax (MCA 15-6-225). No state solar production tax credit or SREC market. Federal ITC (30% under IRA 2022) and USDA REAP grants apply. NorthWestern Energy community solar program limited in capacity.

Active institutional and commercial solar market; state government installations leading; interconnection queue developing

State agency solar projects challenged by county board members in 2024; no formal denial but process friction documented