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Revenue (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |
Total operating revenues | $ 692,714
Regulatory cost recovery revenue | 10,000
Electric Service | Retail Residential |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 316,675
Electric Service | Retail Non-Residential |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 343,189
Electric Service | Wholesale Energy Sales |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 12,089
Transmission Services For Others |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 14,845
Other Sources |
Disaggregation of Revenue [Line Items] |
Total operating revenues | 5,916
Electric and Transmission Service |
Disaggregation of Revenue [Line Items] |
Total operating revenues | $ 683,000

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