Duke Energy Corporation DUK reported first-quarter 2021 adjusted earnings of $1.26 per share, which surpassed the Zacks Consensus Estimate of $1.24 by 1.6%. The bottom line also improved 10.5% year over year, driven by growth in Electric Utilities and Infrastructure from rate case contributions. The adjusted earnings growth also benefited from prior-year unfavorable weather.Including one-time adjustments, the company reported GAAP earnings of $1.25 per share compared with the year-ago quarter’s GAAP earnings of $1.24.Total RevenuesTotal operating revenues came in at $6,150 million, which improved 3.4% from $5,949 million a year ago. The reported figure however missed the Zacks Consensus Estimate of $6,208 million by 0.9%.Duke Energy Corporation Price, Consensus and EPS Surprise Duke Energy Corporation price-consensus-eps-surprise-chart | Duke Energy Corporation QuoteThe Regulated electric unit’s revenues were $5,219 million (up 1.9% year over year), representing 84.9% of total revenues in the quarter.Revenues from the regulated natural gas business totaled $749 million, down 10.6% year over year.The Non-regulated Electric and Other segment generated revenues of $182 million, which dropped 2.7% year over year.Operational UpdateDuke Energy’s total operating expenses amounted to $4,700 million in the reported quarter, up 5.3% year over year. The escalation was on account of higher cost of natural gas; operation, maintenance and other expenses as well as increased depreciation and amortization.Operating income dropped 2.6% to $1,450 million from $1,488 million in the year-ago quarter.Interest expenses fell to $535 million from $551 million in first-quarter 2020.Segmental HighlightsElectric Utilities & Infrastructure: This segment’s income in the first quarter totaled $820 million, higher than $705 million reported in the year-ago quarter.Gas Utilities & Infrastructure: Reported income in this segment totaled $245 million, down from $249 million a year ago.Commercial Renewables: This segment witnessed reported income of $27 million in the quarter under review compared with $57 million in the year-ago quarter.Other: The segment includes corporate interest expenses not allocated to other business units, resulting from Duke Energy’s captive insurance company and other investments.This segment incurred loss of $139 million compared with loss of $112 million in the year-ago quarter.Financial ConditionAs of Mar 31, 2021, Duke Energy had cash & cash equivalents of $379 million, up from $259 million as of Dec 31, 2020. Long-term debt was $54.78 billion at the end of first-quarter 2021 compared with $55.63 billion at 2020-end.In the first quarter of 2021, the company generated net cash from operating activities of $2.09 billion compared with $1.55 billion generated in the prior-year quarter.GuidanceDuke Energy has reaffirmed its 2021 adjusted EPS guidance. The company still expects adjusted earnings per share in the range of $5.00-$5.30. The Zacks Consensus Estimate for 2021 earnings is pegged at $5.17 per share, above the midpoint of the company’s projected range.Zacks RankDuke Energy currently carries a Zacks Rank #3 (Hold). You can see the complete list of today’s Zacks #1 Rank (Strong Buy) stocks here.Recent Utility ReleasesDTE Energy Company DTE reported first-quarter 2021 operating earnings per share (EPS) of $2.44, which surpassed the Zacks Consensus Estimate of $2.16 by 13%.American Electric Power Co., Inc. AEP reported first-quarter 2021 adjusted earnings per share of $1.15, which missed the Zacks Consensus Estimate of $1.23 by 6.5%.NextEra Energy, Inc. NEE reported first-quarter 2021 adjusted earnings of 67 cents per share, which beat the Zacks Consensus Estimate of 60 cents by 11.7%.Zacks Top 10 Stocks for 2021In addition to the stocks discussed above, would you like to know about our 10 best buy-and-hold tickers for the entirety of 2021?Last year's 2020 Zacks Top 10 Stocks portfolio returned gains as high as +386.8%. Now a brand-new portfolio has been handpicked from over 4,000 companies covered by the Zacks Rank. Don’t miss your chance to get in on these long-term buys.Access Zacks Top 10 Stocks for 2021 today >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report American Electric Power Company, Inc. (AEP): Free Stock Analysis Report DTE Energy Company (DTE): Free Stock Analysis Report Duke Energy Corporation (DUK): Free Stock Analysis Report NextEra Energy, Inc. (NEE): Free Stock Analysis Report To read this article on Zacks.com click here.