Background
Northern Indiana Public Service Company sought a refund of Indiana sales and use tax paid on property used to transport electricity owned by third parties during 2015 through 2017. NIPSCO claims the purchases qualify for Indiana’s public-transportation exemption, Indiana Code section 6-2.5-5-27. With cross-motions for summary judgment pending, the Department of State Revenue offered two reports from engineer John A. Williams. The reports addressed the physics of electricity, electric generation and transmission, NIPSCO’s business model, the regulatory framework, and industry records. A rebuttal report challenged analogies and definitions used by NIPSCO’s expert.
NIPSCO moved to exclude Williams’s reports and related testimony. It argued he lacked the particular experience needed to discuss the electric industry, utility regulation, and NIPSCO’s operations; that his reasoning was not scientifically reliable; and that several opinions were forbidden legal conclusions. The dispute required the Tax Court to separate basic physical science from applied utility expertise and, within the surviving material, to distinguish helpful context from conclusions reserved for the court.
The Court’s Holding
Judge McAdam granted the motion in part and denied it in part. Under Indiana Evidence Rule 702(a), Williams’s education and experience qualified him to explain the general nature of electricity, including electromagnetic energy propagation, electron behavior, and the need for generation and load to remain balanced. Those foundational and generally accepted principles also satisfied Rule 702(b)’s reliability requirement. His professional work was sufficient to permit general testimony about the electric industry, regional grids, transmission-system design and coordination, NIPSCO’s company overview and bundled-service business model, and the utility regulatory framework.
The qualification did not extend to interpreting particular regulatory instruments. The Department had not shown that Williams possessed the specialized experience needed to extract meaning from or apply NIPSCO’s FERC reports, NERC standards, federal energy forms, accounting materials, or Indiana Utility Regulatory Commission tariffs. Those portions were stricken. The court also applied Evidence Rule 704(b), which bars an expert from giving opinions about legal conclusions. Williams could supply scientific and industry context even though the Tax Court itself was the factfinder, but he could not decide the legal character of electricity, transportation, or the statutory exemption. The identified legal conclusions were stricken while useful background remained available.
Key Takeaways
- Indiana expert qualification is subject-matter specific. Scientific expertise about electricity does not automatically establish expertise in interpreting utility filings or regulatory instruments.
- Rule 702 requires courts to divide a broad report into distinct fields and ask whether the proponent proved qualifications for each one.
- An expert may explain facts touching an ultimate issue, but Rule 704(b) still reserves legal conclusions and statutory interpretation for the court.
- At summary judgment, expert affidavits must contain evidence that would be admissible at trial under the same qualification and reliability rules.
Why It Matters
The ruling offers Indiana tax and utility practitioners a practical map for building or challenging expert records in technically complex exemption cases. Credentials should be tied to each proposed opinion, especially where a witness moves from physics or engineering into regulated-industry documents. Counsel relying on FERC, NERC, EIA, or IURC materials should establish concrete experience interpreting those specific records rather than assume general engineering work will suffice.
The order does not resolve NIPSCO’s entitlement to the transportation exemption. It shapes the evidence the Tax Court may consider when deciding the pending cross-motions. That makes the decision important beyond this refund dispute: it shows that technical context can assist a specialized court, but an expert cannot use that context to supply the governing legal answer.