{
 "schema": "annalist.dataset/0.1",
 "company": {
  "id": "national-grid",
  "name": "National Grid plc",
  "country": "GB",
  "template": "corporate",
  "cik": "0001004315",
  "tickers": [
   "NG."
  ],
  "lei": "8R95QZMKZLJX5Q2XR704",
  "currency": "GBP",
  "accounting": "IFRS",
  "fiscal_year_end": "03-31"
 },
 "as_of": {
  "period": "FY2026",
  "period_end": "2026-03-31",
  "release_date": null,
  "indexed": "2026-06-11"
 },
 "conventions": {
  "amounts": "in the presentation currency of the annual report, as reported, not scaled; per-share items in that currency per share; share counts in shares",
  "signs": "revenue, expenses, taxes and payments are positive amounts; operating, investing and financing cash-flow totals are negative when cash flows out",
  "fiscal_year": "FY<year> is the fiscal year that ends in that calendar year; start and end dates are given for every period",
  "periods": "fiscal years only; each annual report gives its own year and the year before",
  "restatements": "each value comes from the latest annual report that gives the period; other different values are listed in restatements",
  "comparison": "a change against the same period a year earlier compares 2 figures of one basis, as the latest report that presents both periods gives them, so that a restatement or a stock split between 2 reports does not count as a change; where these figures differ from the published ones, the row of the later period gives them under comparison, with their sources and the fiscal year of the report (basis), and a comparison of null means that no report presents both",
  "definitions": "each item keeps one definition across the years",
  "withheld": "a value that contradicts the definition of its item, or that another official report of the company gives differently, is withheld: it is empty and listed in withheld with its reason and sources. So is a gross profit that revenue less cost of sales does not give, and a cost of sales that a report gives without gross profit",
  "source_ids": "AFR:<LEI>-<fiscal year end>-<sequence>: the annual financial report filed with the Financial Conduct Authority; see documents",
  "methods": "method is reported, or derived where the figure is calculated from figures of the documents listed"
 },
 "coverage": {
  "first_fiscal_year": 2021,
  "latest_period": "FY2026",
  "rule": "every fiscal year of the annual reports since 2021, in the presentation currency of the latest report"
 },
 "items": {
  "pl": {
   "revenue": {
    "label": "Revenue",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "cost_of_revenue": {
    "label": "Cost of sales",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "gross_profit": {
    "label": "Gross profit",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "rnd": {
    "label": "Research and development expense",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "sga": {
    "label": "Selling, general and administrative expense",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "operating_income": {
    "label": "Operating profit",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "interest_expense": {
    "label": "Finance costs",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "pretax_income": {
    "label": "Profit before tax",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "income_tax": {
    "label": "Income tax expense",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "net_income_incl_nci": {
    "label": "Profit including non-controlling interests",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "net_income": {
    "label": "Profit attributable to owners of the parent",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "nci_profit": {
    "label": "Profit attributable to non-controlling interests",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "eps_basic": {
    "label": "Earnings per share, basic",
    "unit": "GBP/shares",
    "additive": false,
    "group": "statement"
   },
   "eps_diluted": {
    "label": "Earnings per share, diluted",
    "unit": "GBP/shares",
    "additive": false,
    "group": "statement"
   },
   "shares_basic": {
    "label": "Weighted average shares, basic",
    "unit": "shares",
    "additive": false,
    "group": "statement"
   },
   "shares_diluted": {
    "label": "Weighted average shares, diluted",
    "unit": "shares",
    "additive": false,
    "group": "statement"
   }
  },
  "bs": {
   "cash": {
    "label": "Cash and cash equivalents",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "receivables": {
    "label": "Trade and other receivables, current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "inventory": {
    "label": "Inventories",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "current_assets": {
    "label": "Total current assets",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "ppe_net": {
    "label": "Property, plant and equipment",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "ppe_including_rou": {
    "label": "Property, plant and equipment, including right-of-use assets",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "right_of_use_assets": {
    "label": "Right-of-use assets",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "goodwill": {
    "label": "Goodwill",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "intangibles": {
    "label": "Intangible assets other than goodwill",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "goodwill_and_intangibles": {
    "label": "Goodwill and intangible assets",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "noncurrent_assets": {
    "label": "Total non-current assets",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "total_assets": {
    "label": "Total assets",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "accounts_payable": {
    "label": "Trade and other payables, current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "debt_current": {
    "label": "Borrowings, current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "long_term_debt": {
    "label": "Borrowings, non-current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "lease_liabilities_current": {
    "label": "Lease liabilities, current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "lease_liabilities_noncurrent": {
    "label": "Lease liabilities, non-current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "borrowings_and_leases_current": {
    "label": "Borrowings and lease liabilities, current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "borrowings_and_leases_noncurrent": {
    "label": "Borrowings and lease liabilities, non-current",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "current_liabilities": {
    "label": "Total current liabilities",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "noncurrent_liabilities": {
    "label": "Total non-current liabilities",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "total_liabilities": {
    "label": "Total liabilities",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "equity_parent": {
    "label": "Equity attributable to owners of the parent",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "retained_earnings": {
    "label": "Retained earnings",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "nci": {
    "label": "Non-controlling interests",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "equity_total": {
    "label": "Total equity",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "liabilities_and_equity": {
    "label": "Total equity and liabilities",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   }
  },
  "cf": {
   "cfo": {
    "label": "Net cash from operating activities",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "cfi": {
    "label": "Net cash from investing activities",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "cff": {
    "label": "Net cash from financing activities",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "capex": {
    "label": "Purchases of property, plant and equipment",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "capex_intangibles": {
    "label": "Purchases of intangible assets",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "d_and_a": {
    "label": "Depreciation and amortisation",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "d_and_a_and_impairment": {
    "label": "Depreciation, amortisation and impairment",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "depreciation": {
    "label": "Depreciation",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "amortisation": {
    "label": "Amortisation",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "sbc": {
    "label": "Share-based payments",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "dividends_paid": {
    "label": "Dividends paid",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "buybacks": {
    "label": "Purchases of own shares",
    "unit": "GBP",
    "additive": true,
    "group": "statement"
   },
   "lease_payments": {
    "label": "Payments of lease liabilities",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "interest_paid": {
    "label": "Interest paid",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   },
   "taxes_paid": {
    "label": "Income taxes paid",
    "unit": "GBP",
    "additive": true,
    "group": "note"
   }
  }
 },
 "pl_quarterly": [],
 "pl_annual": [
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   "start": "2020-04-01",
   "end": "2021-03-31",
   "complete": true,
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    "pretax_income": 1664000000.0,
    "income_tax": 360000000.0,
    "net_income_incl_nci": 1641000000.0,
    "net_income": 1640000000.0,
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    "eps_diluted": 0.463,
    "shares_basic": null,
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   },
   "sources": [
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   ],
   "value_sources": {
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    ],
    "operating_income": [
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    ],
    "interest_expense": [
     "AFR:8R95QZMKZLJX5Q2XR704-2023-03-31-0"
    ],
    "pretax_income": [
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    ],
    "income_tax": [
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    ],
    "net_income_incl_nci": [
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    ],
    "net_income": [
     "AFR:8R95QZMKZLJX5Q2XR704-2023-03-31-0"
    ],
    "nci_profit": [
     "AFR:8R95QZMKZLJX5Q2XR704-2023-03-31-0"
    ],
    "eps_basic": [
     "AFR:8R95QZMKZLJX5Q2XR704-2023-03-31-0"
    ],
    "eps_diluted": [
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    ]
   },
   "method": "reported",
   "value_methods": {}
  },
  {
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    "income_tax": 1258000000.0,
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   },
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    "pretax_income": [
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    "income_tax": [
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    "net_income": [
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    "nci_profit": [
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    "eps_basic": [
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    "eps_diluted": [
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   "values": {
    "revenue": 21659000000.0,
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    "operating_income": 4879000000.0,
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    "income_tax": 876000000.0,
    "net_income_incl_nci": 7797000000.0,
    "net_income": 7797000000.0,
    "nci_profit": 0.0,
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   },
   "sources": [
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   ],
   "value_sources": {
    "revenue": [
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    "operating_income": [
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    "interest_expense": [
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    "pretax_income": [
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    "income_tax": [
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    "net_income_incl_nci": [
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    "net_income": [
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    "nci_profit": [
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    "eps_basic": [
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    "eps_diluted": [
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   },
   "comparison": {
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  },
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    "net_income_incl_nci": 2291000000.0,
    "net_income": 2290000000.0,
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   },
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    "operating_income": 4934000000.0,
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