Linn County planning board reviews draft rules for large battery storage, limits residential rules

The Linn County Planning and Zoning Board on Wednesday nominated new officers and spent the bulk of its meeting reviewing a draft battery energy storage system (BESS) ordinance intended to govern commercial-scale projects in the county.

Board members agreed to remove tier 1 (small residential) systems from the draft and focus rules on tier 2 and tier 3 commercial installations, discussed minimum setback distances and height limits for equipment, and asked staff to refine technical details, public-notice procedures and permit conditions before the next meeting.

The board’s review followed an earlier county commission action that cleared a related tower issue, leaving BESS as the primary planning item for the month. Members repeatedly emphasized that the draft should be tied to the Linn County comprehensive plan and provide clear, enforceable standards before projects reach the conditional use permit (CUP) stage.

Discussion and key directions

Board members said tier definitions should remain explicit in the draft: tier 1 systems at or below about 80 kilowatts; tier 2 roughly 81–600 kilowatts; and tier 3 systems greater than 600 kilowatts. The board agreed that the county does not need new, separate regulations for most residential tier 1 systems and instructed staff to delete tier 1-specific language from the draft so the ordinance focuses on tier 2 and tier 3 commercial-scale installations.

Members discussed proposed siting and design standards that staff had drafted or borrowed from other counties. Suggested directions included: - Clarify that setback measurements apply to operational equipment (the battery/containers/transformers) rather than simply to a fence line. - Consider a 500-foot setback from property lines and environmentally sensitive areas, a 500-foot setback from agricultural operations, and a 1,000-foot setback from dwellings for large (tier 3) facilities (members presented these as draft suggestions, not final rules). - Limit the footprint of a single BESS site to 20 acres (the board later agreed to remove an absolute requirement that a site be adjacent to an existing substation and to revisit substation rules separately). - Set a maximum height for battery housing (shipping-container style battery modules) at about 15 feet and a higher maximum (suggested 25 feet) for substation or transformer structures so that containers and auxiliary equipment are regulated separately.

Safety, environmental and permit conditions

The board directed staff to include and clarify several permit and safety requirements in the CUP process, including an environmental/impact study and pre-construction soil sampling. Members suggested a standard such as five soil samples per acre to establish baseline conditions and a requirement that the applicant post material safety data sheets and emergency-response information at the site entry for local emergency services.

Members also discussed decommissioning requirements and financial assurances. The draft language and board comments would require a decommissioning plan and a bond or financial guarantee; board members suggested a bond sized at roughly 125% of estimated decommissioning costs and recommended that the bond be held in the county’s name and not be accessible to the applicant for other uses.

Several members insisted that emergency-response training and any required exercises for local fire and EMS be provided at the applicant’s expense and be a condition of CUP approval so training is completed before commercial operation.

Technical and operational items

The board debated technical definitions and examples used in the draft: members and a consultant described shipping-container-style BESS modules, noting that container sizes vary and that some commercial projects can be large (examples discussed ranged from several megawatts per container to commercial projects of tens or hundreds of megawatt-hours). The board asked staff to collect manufacturer specifications and sample site layouts so members can judge density, spacing (some members referenced 25 feet between containers as an access/clearance example), and likely acreage needs for tiers 2 and 3 before deciding which zoning districts will allow CUPs.

Other items discussed included: - Public-notice and hearing timing: the board confirmed a 20-day public-notice period for hearings, followed, if needed, by a 14-day waiting period when the item moves to the commissioners. - Signage and lighting: suggested limits included a maximum 500-foot spacing for safety signage around a perimeter (members debated whether this should be a maximum or minimum), and limiting LED color temperatures to about 3,000 Kelvin to reduce light pollution. - Noise: members raised a 40 dBA target at nonparticipating property lines (several members referenced prior wind/solar guidance) and asked staff to verify sound modeling approaches. - Interconnection and agreements: members said applicants should provide interconnection documentation; when applicable, an executed interconnection agreement and evidence of a power purchase or off-take arrangement should be filed before CUP approval.

Process and next steps

Board members asked staff to circulate a revised draft with numbered revisions, to identify where county-specific references (for example "Linn County" rather than language copied from other counties) are needed, and to include clearer cross-references within the draft (for example, where decommissioning requirements are stated). Members agreed to pause further decisions on tier-2 siting (including whether "countryside" zoning should allow tier 2) until they review manufacturer examples and updated layout diagrams at a subsequent meeting.

Officers and procedural actions

Daniel Black nominated Dave Fisher as chair; the board confirmed the appointment by voice vote (mover recorded; second not specified in the transcript). Hal Anderson was nominated and confirmed as vice chair by voice vote. The board also tabled approval of the draft minutes for correction and additional attendance information and adjourned the meeting by voice vote.

Why it matters

The board is working to create county-level rules intended to manage the rapid growth of utility-scale battery storage while protecting rural character, public safety, water and soil resources, and neighboring property uses. The next draft will determine which zoning districts may host utility-scale BESS, which safety and environmental studies will be required before construction, and what financial and operational assurances prospective operators must provide.

The board asked members and interested parties to email comments to staff ahead of the next meeting so staff can circulate a consolidated revision for review.