ROC % measures how well a company generates cash flow relative to the capital it has invested in its business. It is also called ROIC %. National Grid's annualized return on capital (ROC %) for the quarter that ended in Mar. 2026 was 6.18%.
As of today (2026-06-24), National Grid's WACC % is 6.81%. National Grid's ROC % is 4.36% (calculated using TTM income statement data).
National Grid earns returns that do not match up to its cost of capital. It will destroy value as it grows.
National Grid (OTCPK:NGGTF) ROC % Explanation
ROC % measures how well a company generates cash flow relative to the capital it has invested in its business. It is also called ROIC %. The reason book values of debt and equity are used is because the book values are the capital the company received when issuing the debt or receiving the equity investments.
There are four key components to this definition. The first is the use of operating income or EBIT rather than net income in the numerator. The second is the tax adjustment to this operating income or EBIT, computed as a hypothetical tax based on an effective or marginal tax rate. The third is the use of book values for invested capital, rather than market values. The final is the timing difference; the capital invested is from the end of the prior year whereas the operating income or EBIT is the current year's number.
Why is ROC % important?
Because it costs money to raise capital. A firm that generates higher returns on investment than it costs the company to raise the capital needed for that investment is earning excess returns. A firm that expects to continue generating positive excess returns on new investments in the future will see its value increase as growth increases, whereas a firm that earns returns that do not match up to its cost of capital will destroy value as it grows.
As of today, National Grid's WACC % is 6.81%. National Grid's ROC % is 4.36% (calculated using TTM income statement data).
National Grid earns returns that do not match up to its cost of capital. It will destroy value as it grows.
Be Aware
Like ROE % and ROA %, ROC % is calculated with only 12 months of data. Fluctuations in the company's earnings or business cycles can affect the ratio drastically. It is important to look at the ratio from a long term perspective.
National Grid ROC % Related Terms
National Grid ROC % Historical Data
* Premium members only.
The historical data trend for National Grid's ROC % 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.
Note:
The Operating Income data used here is two times the semi-annual (Mar. 2026) data.
The tax rate is limited to between 0% and 100%.
* 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 (NGGTF) has a ROC % of 6.18% as of Mar. 2026. Return on capital is the ratio of current-period net income to average two-period capital. View historical data on National Grid and its competitors.
Is National Grid's ROC % too high?
National Grid's current ROC % is 6.18%. The Utilities - Regulated industry median ROC % is 4.18. National Grid's value of 6.18% is 47.8% above this industry median. Overall, National Grid has a GF Score™ of 74/100 and is considered Significantly Overvalued, reflecting its overall financial health beyond just this single metric.
How does National Grid's ROC % compare to NEE and SO?
National Grid's ROC % of 6.18% can be compared against companies in the Utilities - Regulated industry. The industry median ROC % is 4.18. National Grid's value of 6.18% is 47.8% above this benchmark. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good ROC % for an Utilities - Regulated company?
The median ROC % among Utilities - Regulated companies is 4.18, based on 501 companies in the industry. Companies in the top quartile (top 25%) have a ROC % significantly above this median, while those in the bottom quartile fall well below. However, ROC % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. National Grid's current ROC % of 6.18% is 47.8% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high ROC % mean?
A high ROC % can signal that a stock is expensive relative to its fundamentals. Return on capital is the ratio of current-period net income to average two-period capital. View historical data on National Grid and its competitors. For the Utilities - Regulated industry, the median ROC % is 4.18 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. National Grid's current ROC % is 6.18%. 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 (NGGTF) is currently considered Significantly Overvalued. The stock's GF Value™ is $9.67, compared to a current price of $16.56 — trading 71.2% above its estimated fair value. The current ROC % is 6.18% and 47.8% above the Utilities - Regulated industry median of 4.18. National Grid's overall GF Score™ is 74/100 with 5 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is ROC % calculated?
ROC % is calculated from a company's financial statements. For National Grid (NGGTF), the current ROC % is 6.18% 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 (NGGTF) Overvalued in 2026?
Based on GuruFocus' analysis, National Grid stock appears to be overvalued.
The current stock price of $16.56 is trading 71.2% above its estimated GF Value™ of $9.67.
GuruFocus considers National Grid to be Significantly Overvalued.
Key valuation signals for NGGTF:
ROC %: 6.18%
GF Value™: $9.67 vs. price of $16.56 (71.2% above fair value)
Industry Position: 47.8% above the Utilities - Regulated median
No single metric tells the full story. See the NGGTF stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
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.
74GF Score
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