Major classes of property, plant and equipment as of December 31, 2025 and 2024 include:
(in thousands)20252024
Electric Plant in Service  
Production$1,564,397 $1,469,008 
Transmission849,780 820,415 
Distribution828,008 726,159 
General128,492 165,361 
Electric Plant in Service3,370,677 3,180,943 
Construction Work in Progress233,978 231,890 
Total Gross Electric Plant3,604,655 3,412,833 
Less Accumulated Depreciation
899,401 899,049 
Net Electric Plant2,705,254 2,513,784 
Nonelectric Property, Plant and Equipment
Equipment276,966 260,307 
Buildings and Leasehold Improvements114,377 88,680 
Land13,579 13,578 
Nonelectric Property, Plant and Equipment404,922 362,565 
Construction Work in Progress12,389 40,536 
Total Gross Nonelectric Property, Plant and Equipment417,311 403,101 
Less Accumulated Depreciation
245,880 224,425 
Net Nonelectric Property, Plant and Equipment171,431 178,676 
Net Property, Plant and Equipment$2,876,685 $2,692,460 

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.