Alliant Energy’s October 29, 2026 results release identifies a $15.9 billion capital-expenditure forecast for 2027 through 2030. Its detailed table displays five annual columns, beginning with 2026. To reconcile the headline, first select the four years it actually describes.
Alliant’s October 29 release: forecast period and capital-expenditure table
Add the four matching annual totals
The table states its amounts in millions of dollars. Its total capital-expenditure row gives 4,305 for 2027, 4,735 for 2028, 4,285 for 2029 and 2,610 for 2030. Their sum is 15,935 million dollars, or $15.935 billion. Rounded to one decimal place in billions, that is $15.9 billion.
The displayed 2026 total is $2,860 million. Adding it as well produces $18,795 million, or $18.795 billion, across 2026–2030. That arithmetic answers a five-year question. It does not reveal a discrepancy in a headline explicitly describing the later four years.
Alliant’s company summary: the four-year forecast headline
Keep the forecast’s boundary
Alliant labels these figures projected expenditures. Its table notes exclude allowance for funds used during construction and capitalized interest, where applicable, and identify the estimates as the company’s portion of construction expenditures. Preserve those boundaries when copying the total into a comparison.
A forecast is a dated planning figure, rather than evidence that all the money has already been spent. A table total also does not establish the completion date of every underlying project. Keep the release date and the covered years beside the amount so later readers can see exactly what it represents.
Try a fictional planning comparison
Imagine two fictional infrastructure plans. Plan A lists $2 billion for each of four years, from 2027 through 2030: $8 billion altogether. Plan B lists $1.8 billion for each of five years, from 2026 through 2030: $9 billion altogether. The second total is larger, but its period is also longer.
If the comparison is specifically about 2027–2030, Plan B contributes four annual entries, totaling $7.2 billion. Under these invented, flat annual assumptions, A has the larger matched-period total. This example illustrates period alignment; it is not another utility’s budget or an estimate of Alliant’s spending.
Matching the years is only the first step. A useful comparison also needs consistent units, spending categories and inclusion rules. If those differ, record the difference instead of treating the totals as interchangeable. A larger aggregate alone cannot establish which plan delivers more useful infrastructure.
Build a record that survives the next update
In a planning sheet, use separate fields for source date, first year, final year, currency, units, annual amounts and stated exclusions. Retain the original annual entries alongside the calculated total. That lets a colleague reproduce the calculation without guessing which columns were included.
When a revised plan appears, preserve the previous version and compare the overlapping years before describing a change. An extra year added to a rolling plan can change its total even if the overlapping years stay the same. This guide reconciles published figures; it does not evaluate investment merit or forecast project outcomes.
Match the Spending Period
