National Grid (CHIX:NGL) Operating Income: £5,690 Mil (TTM As of Mar. 2026)


CHIX:NGL National Grid PLC CHIX:NGL
73 GF Score
Price £12.30
GF Value £7.46
Valuation Significantly Overvalued
! 5 Warning Signs
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What is National Grid Operating Income?

National Grid CHIX:NGL -0.14% 73 Operating Income is £5,690 Mil as of Mar. 2026. GuruFocus rates CHIX:NGL with a GF Score™ of 73/100 and a GF Value™ of £7.46 (Significantly Overvalued). The stock has 5 warning signs investors should review.

National Grid's Operating Income for the six months ended in Mar. 2026 was £4,075 Mil. Its Operating Income for the trailing twelve months (TTM) ended in Mar. 2026 was £5,690 Mil.

Operating Margin % is calculated as Operating Income divided by its Revenue. National Grid's Operating Income for the six months ended in Mar. 2026 was £4,075 Mil. National Grid's Revenue for the six months ended in Mar. 2026 was £10,622 Mil. Therefore, National Grid's Operating Margin % for the quarter that ended in Mar. 2026 was 38.36%.

Good Sign:

National Grid PLC operating margin is expanding. Margin expansion is usually a good sign.

National Grid's 5-Year average Growth Rate for Operating Margin % was 11.20% per year.

Operating Income or EBIT is linked to Return on Capital for both regular definition and Joel Greenblatt's definition. National Grid's annualized ROC % for the quarter that ended in Mar. 2026 was 6.22%. National Grid's annualized ROC (Joel Greenblatt) % for the quarter that ended in Mar. 2026 was 10.44%.

National Grid  (CHIX:NGl) Operating Income Explanation

1. Operating Income or EBIT is linked to Return on Capital for both regular definition and Joel Greenblatt's definition.

National Grid's annualized ROC % for the quarter that ended in Mar. 2026 is calculated as:

ROC % (Q: Mar. 2026 )
=NOPAT/Average Invested Capital
=Operating Income * ( 1 - Tax Rate % )/( (Invested Capital (Q: Sep. 2025 ) + Invested Capital (Q: Mar. 2026 ))/ count )
=8150 * ( 1 - 21.78% )/( (99567 + 105529)/ 2 )
=6374.93/102548
=6.22 %

where

Invested Capital(Q: Sep. 2025 )
=Total Assets - Accounts Payable & Accrued Expense - Excess Cash
=Total Assets - Accounts Payable & Accrued Expense - ( Cash, Cash Equivalents, Marketable Securities - max(0, Total Current Liabilities - Total Current Assets+Cash, Cash Equivalents, Marketable Securities))
=103760 - 4451 - ( 4059 - max(0, 9185 - 8927+4059))
=99567

Invested Capital(Q: Mar. 2026 )
=Total Assets - Accounts Payable & Accrued Expense - Excess Cash
=Total Assets - Accounts Payable & Accrued Expense - ( Cash, Cash Equivalents, Marketable Securities - max(0, Total Current Liabilities - Total Current Assets+Cash, Cash Equivalents, Marketable Securities))
=108281 - 5064 - ( 2828 - max(0, 9797 - 7485+2828))
=105529

Note: The Operating Income data used here is two times the semi-annual (Mar. 2026) data.

2. Joel Greenblatt's definition of Return on Capital:

National Grid's annualized ROC (Joel Greenblatt) % for the quarter that ended in Mar. 2026 is calculated as:

ROC (Joel Greenblatt) %(Q: Mar. 2026 )
=EBIT/Average of (Net fixed Assets + Net Working Capital)
=EBIT/Average of (Property, Plant and Equipment+Net Working Capital)
     Q: Sep. 2025  Q: Mar. 2026
=EBIT/( ( (Property, Plant and Equipment + Net Working Capital) + (Property, Plant and Equipment + Net Working Capital) )/ count )
=8242/( ( (76345 + max(-693, 0)) + (81520 + max(-1680, 0)) )/ 2 )
=8242/( ( 76345 + 81520 )/ 2 )
=8242/78932.5
=10.44 %

where Working Capital is:

Working Capital(Q: Sep. 2025 )
=(Accounts Receivable + Total Inventories + Other Current Assets) - (Accounts Payable & Accrued Expense + Defer. Rev. + Other Current Liabilities)
=(2830 + 641 + 1397) - (4451 + 0 + 1110)
=-693

Working Capital(Q: Mar. 2026 )
=(Accounts Receivable + Total Inventories + Other Current Assets) - (Accounts Payable & Accrued Expense + Defer. Rev. + Other Current Liabilities)
=(3091 + 559 + 567) - (5064 + 0 + 833)
=-1680

When net working capital is negative, 0 is used.

Note: The EBIT data used here is two times the semi-annual (Mar. 2026) EBIT data.

3. Operating Income is also linked to Operating Margin %:

National Grid's Operating Margin % for the quarter that ended in Mar. 2026 is calculated as:

Operating Margin %=Operating Income (Q: Mar. 2026 )/Revenue (Q: Mar. 2026 )
=4075/10622
=38.36 %

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

4. Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the Operating Income growth rate using Operating Income per share data.

Be Aware

Compared with a company's EBITDA margin, Operating Margin can be manipulated by adjusting the rate of depreciation, depletion and amortization (DDA).

If a company is facing competition, its Operating Margin may decline. Often the Operating Margin declines well before the company's revenue or even profit decline. Therefore, Operating Margin is a very important indicator of whether the company is facing problems.

For instance, by 2012, Nokia (NOK)'s problems were well known and its stock had lost more than 90% of its market value since 2007. But Nokia's Operating Margin had already been in decline since 2002, although its earnings per share were still rising. Investors who paid attention to Operating Margin would have avoided this huge loss. The same can be said for Research-in-Motion (RIMM).

Therefore, Operating Margin is a very important screening filter for GuruFocus. GuruFocus's Buffett-Munger screener requires that the profit margin is either consistent or expanding. The Model Portfolio of the Buffett-Munger screener has outperformed the market every year since inception in 2009.

National Grid Operating Income Related Terms

National Grid Operating Income Historical Data

* Premium members only.

The historical data trend for National Grid's Operating Income can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

National Grid Operating Income Chart

National Grid Annual Data
Trend Mar17 Mar18 Mar19 Mar20 Mar21 Mar22 Mar23 Mar24 Mar25 Mar26
Operating Income
Get a 7-Day Free Trial Premium Member Only Premium Member Only 4,376.00 4,882.00 4,666.00 5,447.00 5,690.00

National Grid Semi-Annual Data
Sep16 Mar17 Sep17 Mar18 Sep18 Mar19 Sep19 Mar20 Sep20 Mar21 Sep21 Mar22 Sep22 Mar23 Sep23 Mar24 Sep24 Mar25 Sep25 Mar26
Operating Income Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 2,764.00 1,210.00 4,237.00 1,615.00 4,075.00
CHIX:NGL
73GF Score
National Grid PLC CHIX:NGL
Operating Income is just one metric. See GF Score™, valuation, warning signs, and more.
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National Grid Operating Income Calculation

Operating Income, is the profit a company earned through operations. All expenses, including cash expenses such as cost of goods sold (COGS), research & development, wages, and non-cash expenses, such as depreciation, depletion and amortization, have been deducted from the sales.

Operating Income for the trailing twelve months (TTM) ended in Mar. 2026 adds up the semi-annually data reported by the company within the most recent 12 months, which was £5,690 Mil.

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Frequently Asked Questions Learn more about Operating Income →
What does a Operating Income of £5,690 Mil mean?
National Grid (CHIX:NGL) has a Operating Income of £5,690 Mil as of Mar. 2026. Operating Income equals sales less all operating expenses. It is linked to EBIT. View historical data on National Grid and its competitors.
Is National Grid's Operating Income too high?
National Grid's current Operating Income is £5,690 Mil. Overall, National Grid has a GF Score™ of 73/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does National Grid's Operating Income compare to NEE and SO?
National Grid's Operating Income of £5,690 Mil can be compared against companies in the Utilities - Regulated industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Operating Income for an Utilities - Regulated company?
A good Operating Income depends on the Utilities - Regulated industry context. However, Operating Income should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Operating Income mean?
A high Operating Income can signal that a stock is expensive relative to its fundamentals. Operating Income equals sales less all operating expenses. It is linked to EBIT. View historical data on National Grid and its competitors. National Grid's current Operating Income is £5,690 Mil. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is National Grid stock overvalued right now?
Based on GuruFocus' analysis, National Grid (CHIX:NGL) is currently considered Significantly Overvalued. The stock's GF Value™ is £7.46, compared to a current price of £12.30 — trading 64.8% above its estimated fair value. The current Operating Income is £5,690 Mil. National Grid's overall GF Score™ is 73/100 with 5 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Operating Income calculated?
Operating Income is calculated from a company's financial statements. For National Grid (CHIX:NGL), the current Operating Income is £5,690 Mil as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is National Grid (CHIX:NGL) Overvalued in 2026?

Based on GuruFocus' analysis, National Grid stock appears to be overvalued. The current stock price of £12.30 is trading 64.8% above its estimated GF Value™ of £7.46. GuruFocus considers National Grid to be Significantly Overvalued.

Key valuation signals for CHIX:NGL:

  • Operating Income: £5,690 Mil
  • GF Value™: £7.46 vs. price of £12.30 (64.8% above fair value)
  • GF Score™: 73/100 with 5 warning signs

No single metric tells the full story. See the CHIX:NGL stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

National Grid Business Description

Address 1-3 Strand, London, GBR, WC2N 5EH
National Grid owns and operates the electric transmission system in England and Wales. It sold the bulk of its UK gas transmission business in fiscal 2023 to fund the acquisition of PPL's UK power distribution assets. In the Northeastern United States, it serves electricity and gas customers combined in three states. It also owns regulated transmission electricity networks in the United States, metering services and merchant transmission lines in the UK.
73GF Score

Get the complete analysis for CHIX:NGL

Operating Income is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

£12.30
Price
£7.46
GF Value