Financial numbers become easier to understand when you calculate one relationship at a time.
This article uses real company data from Siemens Energy, Constellation, and Iberdrola.
You do not need a complex spreadsheet. A basic calculator is enough.
The important part is knowing which numbers came from the company, which numbers you calculated yourself, and which numbers are only assumptions used to test a scenario.
Reported numbers are facts from the source. Calculated numbers are arithmetic built from those facts. Assumed numbers are scenario inputs, not company forecasts.
After reading this article, you should be able to calculate book-to-bill and rough backlog coverage, convert a data-center power agreement from MW into annual MWh, test a revenue scenario without calling it a forecast, and interpret rate-base growth without making a common ROE mistake.
Before You Calculate Anything, Use Three Labels
| Label | Meaning |
|---|---|
| Reported | A number taken directly from an official company source. |
| Calculated | Your arithmetic using reported numbers. |
| Assumed | A value you choose to test a scenario. |
This simple labeling rule prevents an estimate from quietly turning into a “company number.”
Example 1: Siemens Energy — How Large Is the Backlog Relative to Current Delivery?
We will use the latest reported quarter for Siemens Energy’s Grid Technologies business.
For Q3 FY2026, the company reported:
- Orders: €5.367 billion
- Revenue: €3.624 billion
- Profit: €718 million
- Profit margin: 19.8%
- Backlog: €51 billion
- Prior-year orders: €4.218 billion
These are reported values.[1]
Backlog means accepted work that has not yet been fully delivered. In Korean financial writing, it is commonly translated as ìˆ˜ì£¼ìž”ê³ .
Calculation 1: Book-to-Bill
Book-to-bill compares new orders with revenue recognized during the same period.
Book-to-bill = Orders ÷ Revenue
5,367 ÷ 3,624 = 1.48
Calculated result: 1.48.
This matches the company’s reported book-to-bill ratio.
The plain-language meaning is simple: during the quarter, new orders arrived about 1.48 times as fast as the business recognized revenue.
It does not tell us how quickly every order will be delivered or what margin each order will earn.
Calculation 2: Operating Margin
718 ÷ 3,624 × 100 = 19.8%
Calculated result: 19.8%.
This also matches the reported margin.
Here the calculation is mostly a definition check. It confirms that we are using the same profit and revenue scope as the company.
Calculation 3: Rough Backlog Coverage
Now we can ask a different question: how large is the €51 billion backlog compared with the current revenue run rate?
First, annualize one quarter of revenue:
€3.624bn × 4 = €14.496bn
Then compare backlog with that annualized revenue:
€51bn ÷ €14.496bn = 3.52
Calculated result: about 3.5 years of current annualized revenue.
This is not company guidance. It is not a delivery schedule either.
Revenue is growing, different backlog items have different completion dates, and the business mix changes over time.
The calculation tells us only that backlog is very large relative to the current delivery rate.
Calculation 4: Why Growth Definitions Matter
Using the displayed euro values:
(5,367 ÷ 4,218 − 1) × 100 = 27.2%
Calculated nominal order growth: about 27.2%.
Siemens Energy reported comparable order growth of 27.6%.
The difference is small, but the lesson is important. Comparable growth adjusts for currency translation and portfolio effects, while our calculation uses the displayed euro amounts.
The arithmetic can be correct even when the comparison basis is different.
Also notice what happened beyond backlog. Grid Technologies revenue rose 28.6% year over year, expanded production capacity supported growth, and the profit margin rose to 19.8%. That gives us evidence that the company was not only collecting orders; it was also increasing delivery and profitability.[1]
Example 2: Constellation — Turn 380 MW Into Annual Energy
Constellation’s Calpine business signed a 380 MW agreement with CyrusOne to connect and serve a new data center next to the Freestone Energy Center in Texas.[2]
The 380 MW figure is reported.
The electricity price in the agreement is not public.
That means we can calculate energy scenarios, but we should not present a revenue number as a company forecast.
First, Separate MW From MWh
MW, or megawatts, measures power: how much electricity is being used or delivered at a moment in time.
MWh, or megawatt-hours, measures energy: how much electricity is used over a period of time.
A 380 MW data center does not automatically use 380 MW every hour of the year.
For a scenario, we need an assumed load factor. Load factor compares average power use with the maximum or contracted power level over time.
Calculation 1: Annual Energy at a 90% Load Factor
Reported: 380 MW.
Assumed: 90% average load factor.
A year has 8,760 hours.
Annual energy = MW × hours × load factor
380 × 8,760 × 0.90 = 2,995,920 MWh
Calculated result: about 3.0 TWh per year.
TWh, or terawatt-hours, equals one million MWh.
What If the Load Factor Is Different?
| Assumed load factor | Calculated annual energy |
|---|---|
| 85% | 2,829,480 MWh ≈ 2.83 TWh |
| 90% | 2,995,920 MWh ≈ 3.00 TWh |
| 95% | 3,162,360 MWh ≈ 3.16 TWh |
This table shows why the utilization assumption matters. The reported 380 MW stays the same, but annual energy changes.
Calculation 2: A Revenue Sensitivity, Not a Forecast
Keep the assumed 90% load factor, which gives 2,995,920 MWh per year.
Now test three assumed electricity values.
| Assumed value | Calculation | Gross annual energy-value scenario |
|---|---|---|
| $60/MWh | 2,995,920 × 60 | $179.8 million |
| $80/MWh | 2,995,920 × 80 | $239.7 million |
| $100/MWh | 2,995,920 × 100 | $299.6 million |
These are not reported revenue figures and they are not profit estimates.
The actual agreement includes more than a simple electricity-price multiplication. It provides power, grid connectivity, and site infrastructure. The calculation above also ignores fuel costs, capacity and grid charges, contract structure, connection costs, maintenance, taxes, financing, and other terms.
Its purpose is narrower: to show how a reported MW figure can be translated into annual energy and then into a transparent scenario.
Do not add the separate Phase 2 exclusivity arrangement as if it were already the same operating contract as the first 380 MW phase.
Example 3: Iberdrola — Read Network Investment and Rate Base Correctly
Iberdrola’s current results and strategic plan give us two useful views.
For the first half of 2026, Iberdrola reported:
- Total investment: about €7.0 billion
- Networks investment: about €4.4 billion
- Share of investment allocated to networks: 63%
- Network regulated asset base: about €55 billion
- Year-over-year RAB growth: 11%
These are reported figures.[3]
Rate base, or regulated asset base in many non-U.S. markets, is the value of eligible regulated assets on which the company can earn an approved return under the relevant regulatory framework.
Calculation 1: Check the Network Share of Investment
€4.4bn ÷ €7.0bn × 100 = 62.9%
Calculated result: about 62.9%.
That is consistent with Iberdrola’s rounded headline figure of 63%.
This is a useful check because it tells us that the majority of current investment is going into regulated electricity networks rather than only into generation projects.
Calculation 2: Compare Current RAB With the 2028 Plan
Iberdrola’s 2025–2028 strategic plan targets roughly €70 billion of regulated asset base by 2028 and €37 billion of network investment within a €58 billion total investment plan.[4]
Current H1 2026 RAB is about €55 billion.
One simple scale comparison is:
€55bn ÷ €70bn × 100 = 78.6%
Calculated result: current RAB is about 78.6% of the 2028 target level.
Do not call the strategic plan “78.6% complete.”
Rate base changes through new investment, depreciation, asset sales, currency movements, and regulatory decisions. The calculation only compares the current reported asset base with the target asset-base level.
Calculation 3: The Original Plan’s Rate-Base Growth
The strategic plan used about €49 billion of 2024 regulated asset base and a target of about €70 billion in 2028.
Total planned growth:
(70 ÷ 49 − 1) × 100 = 42.9%
Approximate four-year compound annual growth rate:
(70 ÷ 49)^(1 ÷ 4) − 1 = 9.3%
Calculated result: about 9.3% annualized RAB growth over the plan period.
This is a calculation based on plan endpoints. It is not a guarantee that every year will grow by 9.3%.
Do Not Make This ROE Shortcut
Iberdrola’s strategic plan cited an average ROE around 9.5% for its regulated network frameworks.
It is tempting to write:
€55bn × 9.5% = €5.225bn
and call that annual profit.
That would be wrong.
ROE, or return on equity, applies to the regulated equity portion under the relevant regulatory framework—not automatically to the entire gross asset base.
Debt, capital structure, taxes, depreciation, operating costs, jurisdiction-specific rules, and timing all matter.
The lesson is more useful than the shortcut: do not multiply two financial numbers until you know that their definitions belong in the same equation.
Put the Three Examples on One Page
| Example | What the calculation helps you understand | What it does not prove |
|---|---|---|
| Siemens Energy | Orders are arriving faster than revenue, and backlog is large relative to the current run rate. | That every backlog item will convert in 3.5 years or at the same margin. |
| Constellation / CyrusOne | 380 MW can translate to roughly 3.0 TWh/year at an assumed 90% load factor. | The actual contract price, revenue, cost, or profit. |
| Iberdrola | Most current investment is going to networks, and RAB can be compared with the long-term target. | That the full RAB earns the stated ROE as net profit. |
Five Calculator Rules That Prevent Most Mistakes
- Keep the units visible.
MW, MWh, euros, dollars, and percentages measure different things. - Match the time period.
If you annualize a quarter, label the result as a run-rate calculation rather than a forecast. - Keep reported, calculated, and assumed values separate.
An assumed electricity price is not a disclosed contract price. - Check the financial definition before combining two numbers.
Rate base × ROE is a good example of a shortcut that can be misleading. - End with the next business question.
A useful calculation should tell you what you still need to verify.
What Reader Questions Are These Calculations Solving?
Investors often see MW, backlog, rate base, or ROE in a headline and immediately want to turn the number into revenue or profit.
That is where many errors begin.
The practical questions are simpler:
- What was actually reported?
- What can I calculate directly from it?
- Which input am I assuming?
- What does the result tell me?
- What does it still not tell me?
This is especially important in AI infrastructure because many projects are long-term, capital intensive, and reported in different units.
The Main Idea
You do not need a complicated valuation model to begin learning from company data.
Start with an official number. Perform one transparent calculation. Keep the unit visible. Label any assumption. Then state what the result can and cannot tell you.
That process is slow enough to prevent many mistakes and simple enough to repeat after every earnings report.
A useful calculation does not remove uncertainty. It makes the known facts, the arithmetic, and the remaining uncertainty easier to see.
Continue Reading
- How to Research AI Infrastructure Companies: What to Read, What to Track, and What to Ignore
- Is a Big Backlog Really Good? How to Analyze Capacity in AI Infrastructure Companies
- How to Analyze Power Companies for AI Data Center Growth: 7 Questions to Ask
- How to Compare AI Infrastructure Stocks: 8 Numbers Investors Should Check
Key Terms
- reported: a number taken directly from an official company source
- calculated: arithmetic performed using reported numbers
- assumed: a scenario input chosen by the analyst rather than disclosed by the company
- backlog: accepted work not yet fully delivered; often translated as 수주잔ê³
- book-to-bill: new orders divided by revenue during the same period
- run rate: a simple annualized pace based on a shorter current period
- MW: megawatt, a measure of power at a point in time
- MWh: megawatt-hour, a measure of energy used or delivered over time
- load factor: average power use divided by maximum or contracted power over a period
- RAB / rate base: eligible regulated assets on which a utility may earn an approved return
- ROE: return on equity, a return measure applied to shareholder equity rather than automatically to the full asset base
Sources
- Siemens Energy — Q3 FY2026 results.
- Constellation / CyrusOne — 380 MW Freestone data-center agreement.
- Iberdrola — H1 2026 results.
- Iberdrola — 2025–2028 Strategic Plan.
Status checked October 1, 2026. The 380 MW power price and load factor scenarios are assumptions, not disclosed contract terms. Backlog coverage is a run-rate check, not company guidance. Utility rate-base returns depend on the regulatory framework and capital structure.