Author: Taylor Warfield, Former Bain Manager and interviewer

Last Updated: October 14, 2026

 

An energy case interview asks you to segment the energy value chain first, identify which segment owns the problem, and only then apply a standard framework inside that segment. This guide covers the six energy case types you will actually see, the metrics interviewers expect you to know, and two fully worked examples with current data.

 

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Key Takeaways

 

Energy cases are ordinary consulting cases wrapped around a value chain you have to segment before you structure, and the candidates who pass are the ones who ask which part of the business is broken before drawing a single branch.

 

• Segment before you structure: upstream, midstream, downstream, generation, and delivery all earn money differently

 

• Regulated utilities do not maximize profit, they earn an approved return on invested capital, which flips the usual profitability logic

 

• Never quote a revenue or profit number without stating the commodity price you assumed

 

• Capacity in megawatts and energy in megawatt hours are not interchangeable, and mixing them is the fastest way to lose the interviewer

 

• You need roughly 10 industry terms, not an engineering degree

 

• Data center power demand is the live topic in energy consulting right now and shows up in capacity, pricing, and market entry cases

 

What Is an Energy Case Interview?

 

An energy case interview is a consulting case set in the oil and gas, power, utilities, or renewables sector, where you must segment the value chain before applying a framework. The difficulty is not the math. It is that revenue tracks commodity prices you cannot control, returns are often set by regulators, and capital decisions play out over decades.

 

The word "energy" covers two businesses that behave almost nothing alike. Hydrocarbons are a commodity business where price is set by global markets, and power is a delivery business where price is frequently set by a state commission.

 

Both show up under the same practice names at most firms. A candidate who prepares only for oil and gas walks into a utility case and has nothing to say.

 

How Are Energy Case Interviews Different from Standard Cases?

 

Four differences separate energy cases from the profitability and market entry cases you have already practiced. Each one changes how you build your structure, not just what you say afterward.

 

Price is an input, not a decision

 

In most industries, a company sets its own price. An upstream producer sells into a global market and takes whatever the market gives, so a swing in crude prices moves revenue almost one for one with no management action involved.

 

This has a practical consequence for your structure. When you build a revenue branch in an energy case, split it into realized price and volume, then say out loud which price you are assuming.

 

Capital cycles run 10 years or longer

 

A retailer decides on a store this quarter and opens it next year. An offshore field or a transmission line commits capital that will not produce a dollar of revenue for the better part of a decade, which means the case question is usually about capital allocation rather than operations.

 

Standard case interview frameworks still apply here. You just need to carry a time dimension through the analysis rather than solving for a single year.

 

A large part of the sector is regulated

 

Investor-owned electric and gas utilities do not set their own rates. A state commission approves what they can charge, which turns the usual "how do we grow profit" question into "how do we grow the asset base the regulator will let us earn a return on."

 

This is the single biggest gap I see in candidate preparation. Most people can structure a refinery case and go completely blank on a utility case.

 

Two capital flows are running at once

 

According to the International Energy Agency's World Energy Investment 2025 report, global energy investment reached a record 3.3 trillion dollars in 2025, split between 2.2 trillion for clean technologies and 1.1 trillion for oil, natural gas, and coal. The same report notes that electricity sector investment of 1.5 trillion dollars now runs about 50% higher than everything spent bringing oil, gas, and coal to market.

 

Energy clients are running a legacy business and a build-out at the same time. Cases increasingly ask you to allocate capital between the two rather than optimize either one in isolation.

 

What Does the Energy Value Chain Look Like?

 

The energy value chain has six segments across two branches: hydrocarbons run upstream to midstream to downstream, and electricity runs generation to transmission and distribution to retail. Each segment has a different revenue model, a different cost structure, and a different sensitivity to commodity prices.

 

Segment	What it does	How it earns money	What usually drives the case
Upstream	Explores for and produces oil and gas	Realized price per barrel times production volume	Breakeven price, decline rates, which fields to drill
Midstream	Pipelines, storage, processing, LNG terminals	Fee per unit moved or stored under contract	Throughput, tariff rates, contract coverage
Downstream	Refines crude into fuels and sells them	Product value minus crude cost, called the crack spread	Utilization, product mix, refinery complexity
Generation	Runs power plants that make electricity	Power price times megawatt hours produced	Fuel cost, capacity factor, dispatch order
Transmission and distribution	Moves electricity from plants to customers	Approved return on the value of assets in service	Capital spend, rate cases, reliability, interconnection
Retail and marketing	Bills end customers and manages supply contracts	Margin between retail price and wholesale cost	Churn, customer acquisition cost, hedging

 

How does the oil and gas value chain work?

 

Upstream carries the price risk, midstream carries almost none, and downstream carries margin risk instead of price risk. A vertically integrated major runs all three at once, which is why applying one profit tree to the whole company gets you nowhere.

 

Midstream deserves special attention because candidates get it wrong constantly. A pipeline earns a fee for moving a barrel and does not care much what the barrel is worth, so calling it a commodity-exposed business tells the interviewer you have not done the reading. Most oil and gas case interview prompts hinge on this distinction somewhere.

 

Downstream economics are about throughput and fixed cost absorption. A refinery running at 84% of capacity spreads the same maintenance, labor, and depreciation over fewer barrels than one running at 92%, and that alone can cut margins in half.

 

How does the power and utilities value chain work?

 

Electricity splits into making it, moving it, and selling it. In many US states these are separate businesses with separate economics, and in others a single vertically integrated utility does all three under one regulator.

 

Generation is a merit order business. Plants get dispatched cheapest first, so a plant's profitability depends less on its own cost than on where it sits in the stack relative to everyone else that hour.

 

Transmission and distribution is the part that looks least like anything else you have cased. It is covered in its own section below because the profit logic genuinely inverts.

 

Why does natural gas get its own treatment?

 

Natural gas sits awkwardly across the value chain because it is both a fuel and a feedstock, and because it cannot be moved without dedicated infrastructure. Oil travels in tankers to anywhere with a port, while gas needs a pipeline or a liquefaction terminal, which is why gas prices differ enormously between regions.

 

Liquefied natural gas exists to solve exactly that problem. The IEA reports that liquefaction projects under construction in the United States represent about 130 billion cubic meters of annual export capacity, close to doubling what the country can currently ship.

 

For a case, treat LNG as a logistics chain with a chemistry step in the middle. The analysis looks a lot like a supply chain case interview, with liquefaction, shipping, and regasification as the nodes where cost and capacity constraints show up.

 

Where do renewables fit in?

 

Renewables are generation assets with almost no fuel cost and a large upfront capital cost, which makes them a financing problem more than an operating problem. Revenue is usually locked in through a long-term power purchase agreement rather than sold at spot prices.

 

The number that governs everything is capacity factor: the share of a year a plant actually produces at full rated output. Per US Energy Information Administration data for 2025, natural gas supplied about 41% of US utility-scale generation, renewables about 24%, nuclear about 18%, and coal about 17%.

 

Those shares hide a bigger gap in reliability. EIA reported 2025 capacity factors of 91.0% for nuclear, 58.4% for natural gas combined cycle, 48.7% for coal, 34.2% for wind, and 24.4% for utility-scale solar, and that spread is the reason a case about "adding 500 megawatts" means something completely different depending on the technology.

 

How Do Regulated Utilities Actually Make Money?

 

A regulated utility earns an approved percentage return on the capital it has invested in assets serving customers. That asset base is called the rate base, and the approved percentage is the allowed return on equity, set by a state commission in a proceeding called a rate case.

 

The formula candidates should have ready is simple. Allowed earnings equal rate base times the equity share of the capital structure times the allowed return on equity.

 

Here's what that means in practice: the way a regulated utility grows earnings is by investing more capital, not by selling more electricity. Cutting costs helps customers before it helps shareholders, because savings get passed through in the next rate case.

 

Recent decisions give you a range to work with. In December 2025, the California Public Utilities Commission lowered the allowed return on equity for the state's four large investor-owned utilities by 0.3 percentage points each, landing just under 10%.

 

Florida sits at the other end. Per NextEra's November 2025 filing with the SEC, the Florida Public Service Commission approved a four-year agreement setting Florida Power and Light's authorized return on equity at 10.95% within a band of 9.95% to 11.95%, on a 59.6% equity ratio.

 

That equity ratio matters more than candidates expect. A higher approved equity share means a larger slice of the rate base earns the equity return rather than the lower cost of debt, which lifts earnings without any change to the allowed percentage.

 

Two more terms belong in your vocabulary here. Regulatory lag is the delay between spending capital and being allowed to earn on it, and a constructive jurisdiction is a state where commissions approve requests quickly and close to what the utility asked for.

 

If a utility case asks how to improve returns, your branches are: grow the rate base, win a higher allowed return, shorten regulatory lag, and reduce the gap between allowed and actually earned returns. That last branch is where most of the real consulting work happens.

 

What Energy Metrics and Units Do You Need to Know?

 

You need about 10 terms, and none of them require technical training. The list below covers what I have seen come up repeatedly in energy interviews, and knowing it cold buys you a lot of credibility in the first two minutes.

 

Term	What it means	Why it matters in a case
MW vs. MWh	Megawatts measure capacity at a moment, megawatt hours measure energy over time	Mixing them produces answers that are wrong by orders of magnitude
Capacity factor	Actual output divided by output at full rating all year	Converts nameplate capacity into energy you can actually sell
BOE	Barrel of oil equivalent, used to combine oil and gas volumes	Lets you compare producers with different product mixes
Lifting cost	Operating cost to produce one barrel from an existing well	The variable cost line in an upstream profit tree
Breakeven price	The realized price at which a project earns its target return	Decides whether a field gets drilled or shelved
Crack spread	Value of refined products minus the cost of crude input	The margin line in almost every refining case
Throughput	Volume moving through a pipeline, terminal, or refinery	The volume driver for midstream and downstream
Rate base	Value of utility assets the regulator lets it earn a return on	The earnings driver for any regulated utility case
Allowed ROE	Return on equity a commission approves in a rate case	Sets the ceiling on regulated profitability
PPA	Power purchase agreement, a long-term contract to buy output	Turns a volatile revenue stream into a fixed one

 

The unit trap is worth dwelling on. A 500 megawatt plant running flat out for a year produces 500 times 8,760 hours, or 4.38 million megawatt hours, and candidates who never make that conversion explicit end up multiplying capacity by a price per megawatt hour and landing three orders of magnitude off. Practicing case interview math with unit conversions built in is the cheapest fix for this.

 

What Are the Most Common Energy Case Interview Types?

 

Six case types cover the overwhelming majority of energy interviews. Each is a familiar case archetype with an energy-specific layer added on top.

 

1. Segment profitability

 

A business unit is underperforming and you have to find out why. The energy twist is that you must identify the segment before you build the tree, because a 5% margin is excellent in refining and terrible in midstream. Everything you know about a profitability case interview still applies once the segment is fixed.

 

2. Capacity and capital allocation

 

Should the client build a new plant, expand a pipeline, or add refinery complexity? These cases turn on projected demand, the cost of new capacity, and returns under multiple price scenarios rather than a single point estimate. A capacity expansion case interview in energy usually needs a discounted cash flow view because the payback runs past 10 years.

 

3. Market entry

 

A client wants to enter a new geography, fuel, or technology. Beyond the usual market size and competition work, energy adds three gates: the regulatory regime, physical infrastructure access, and the price at which the new business breaks even. Run your normal structure for market entry case interviews and hang those three gates off the feasibility branch.

 

4. Mergers, acquisitions, and portfolio moves

 

Should the client buy an upstream asset, sell a retail network, or spin off midstream? Energy assets trade on enterprise value to EBITDA plus asset-specific measures like dollars per barrel of daily production, so valuation questions get more concrete than in other sectors. The commercial work here mirrors a due diligence case interview with reserve quality and contract terms added.

 

5. Operations and cost reduction

 

Where can the client take cost out without losing production or throughput? Common levers are procurement, maintenance scheduling, unplanned downtime, and logistics, and the biggest single number is usually reliability. A standard cost reduction case interview structure works, with fixed cost absorption made explicit.

 

6. Energy transition and decarbonization

 

The client has to fund new-energy investment out of legacy cash flows while emissions targets tighten. Treat this as a capital allocation question with a carbon constraint rather than a separate strategic exercise. If your case leans heavily on emissions accounting, the structures from an ESG case interview transfer directly.

 

Energy Case Interview Example: Refinery Profitability

 

This example uses illustrative round numbers so you can follow the logic. In a real interview the interviewer hands you each figure as you ask for it.

 

Interviewer: Our client runs a 250,000 barrel per day refinery on the US Gulf Coast. EBITDA margin has fallen from 9% to 5% over the past year even though crude prices have been steady. What is going on and what should they do?

 

You: Before structuring, I want to confirm two things. Has the crack spread moved, and has utilization changed over the same period?

 

Interviewer: Crack spreads are flat. Utilization has gone from 92% to 84%.

 

You: That points me toward volume rather than price. Let me quantify it: at 250,000 barrels per day of capacity, 92% utilization is 230,000 barrels per day and 84% is 210,000, so we have lost 20,000 barrels per day of throughput.

 

Notice what happened there. Stating a case interview hypothesis before the math keeps the interviewer with you instead of watching you calculate in silence.

 

You: If contribution is roughly 9 dollars per barrel and the refinery runs about 350 days a year after turnarounds, the throughput gap costs 20,000 times 9 times 350, or about 63 million dollars a year. Can you tell me what is causing the utilization drop?

 

Interviewer: About 60% is unplanned outages at the coker unit. The other 40% is a crude supply contract that lapsed and was not replaced.

 

You: Then we have two separate problems worth different amounts. The coker reliability issue accounts for 12,000 barrels per day, or roughly 37.8 million dollars annually, and the supply gap accounts for 8,000 barrels per day, or about 25.2 million.

 

The recommendation writes itself once the split is quantified. Fix the coker first because it is larger, fully within the client's control, and has a repair cost you can price against 37.8 million dollars of annual recovery.

 

Then re-tender crude supply in parallel, testing alternative grades for compatibility with the refinery's configuration before signing anything. What makes this answer strong is not the arithmetic but the fact that it separates two root causes and sizes each one.

 

Energy Case Interview Example: Powering a Data Center

 

This second example is the kind of case energy practices are actually running today, and it exercises the utility economics most candidates skip. Numbers again are illustrative.

 

Interviewer: A regulated utility has been asked to serve a new 500 megawatt data center campus by 2029. Should it build a combined cycle gas plant or contract solar plus storage? What do you need to know?

 

You: First I want to size the actual energy requirement, because 500 megawatts is capacity, not consumption. If the campus draws 90% of its peak around the clock, average load is 450 megawatts, which over 8,760 hours is about 3.9 million megawatt hours a year.

 

That conversion is the whole case. A gas plant with high availability can serve 450 megawatts of steady load with roughly 500 megawatts of nameplate capacity.

 

Solar cannot. At the 24.4% capacity factor EIA reported for utility-scale solar in 2025, matching 450 megawatts of average output would take roughly 1,850 megawatts of solar nameplate plus enough storage to shift output into the overnight hours.

 

Now bring in the regulated economics, which is where candidates separate themselves. Assume the gas plant costs 1,200 dollars per kilowatt, putting about 600 million dollars into rate base, and assume a 50% equity layer at a 10% allowed return.

 

That is 300 million dollars of equity earning 10%, or roughly 30 million dollars a year of allowed equity return for the utility. The build decision is therefore not only an engineering comparison but a question about which option the commission will approve into rate base and how quickly.

 

Strong candidates close by naming what they would test next: whether the data center signs a long-term contract that protects other ratepayers, whether interconnection and permitting can be completed by 2029, and whether the utility can earn on contracted renewables the same way it earns on owned generation. Working through the NPV case interview mechanics for both options is the natural next step if the interviewer pushes further.

 

The reason this case type keeps appearing is straightforward. EIA's Annual Energy Outlook 2026 estimates that servers alone accounted for about 7% of US commercial sector electricity consumption in 2025, and projects that share climbing to between 22% and 33% of commercial building electricity use by 2050.

 

Which Consulting Firms Give Energy Case Interviews?

 

Every major consulting firm has an energy practice, and the type of case you get depends heavily on which practice you are interviewing for. Firms will also probe energy experience already on your resume, so a summer at a utility makes an energy case far more likely regardless of the office.

 

Firm	Energy practice structure	Typical case focus
McKinsey	Separate Oil and Gas and Electric Power and Natural Gas practices	Capital allocation, portfolio strategy, transition planning
BCG	Energy practice spanning power, oil and gas, and climate	Market entry, growth strategy, portfolio rationalization
Bain	Energy and natural resources practice	Private equity due diligence, performance improvement
Deloitte	Energy, Resources and Industrials	Operations, digital transformation, regulatory compliance
Oliver Wyman	Energy and natural resources, strong in utilities	Regulatory strategy, rate design, pricing
Kearney	Energy and process industries	Procurement, supply chain, operations improvement

 

The McKinsey split is worth noting when you prepare. Because the firm runs Oil and Gas and Electric Power and Natural Gas as separate practices, a McKinsey case interview for the power practice can look nothing like one for the oil and gas practice.

 

Adjacent sectors borrow the same structures. Cases at heavy industrial clients often mirror a mining case interview, where reserve life, extraction cost, and commodity price exposure drive the analysis in exactly the same way.

 

How Do You Prepare for an Energy Case Interview?

 

Two weeks of focused work is enough if your case fundamentals are already solid. The tips below are ordered the way I would actually sequence them for a candidate I was coaching.

 

Tip #1: Learn the value chain before you touch a case

 

Spend two evenings until you can name every segment, its revenue model, and its price exposure from memory. This is the one piece of content knowledge that is genuinely non-negotiable, because you cannot segment a business you cannot describe.

 

Tip #2: Memorize the metrics table, not the numbers

 

Interviewers give you figures. What they will not give you is the meaning of a crack spread or a capacity factor, and pausing to ask what a basic term means costs you credibility in a sector interview.

 

Tip #3: Drill unit conversions until they are automatic

 

Practice converting megawatts to megawatt hours, barrels per day to barrels per year, and dollars per barrel to total contribution. Write the units next to every number on your paper so a slip becomes visible before you say it out loud.

 

Tip #4: Always name your price assumption

 

Say "at 70 dollars per barrel" or "assuming current spreads hold" every time you produce a revenue or profit figure. This single habit signals sector fluency more reliably than any piece of trivia you could memorize.

 

Tip #5: Practice one utility case for every two oil and gas cases

 

Most available practice material skews heavily toward hydrocarbons, which leaves candidates helpless on regulated utility prompts. Deliberately build cases around rate base growth, interconnection queues, and reliability spending to close that gap.

 

Tip #6: Read one industry outlook before your interview

 

An hour with a current EIA or IEA outlook gives you two or three specific facts you can work into the case naturally. In my experience at Bain, the candidates who referenced a real current dynamic rather than a generic trend consistently scored higher on business judgment.

 

Tip #7: Prepare a credible answer for "why energy"

 

Sector practices ask this in nearly every round, and a vague answer about caring for the planet lands badly. My fit interview course covers how to build these answers around a specific experience rather than a stated interest.

 

Tip #8: Build idea lists for the four recurring energy questions

 

Energy cases almost always include an open question about reducing emissions, cutting downtime, securing supply, or funding new capacity. Prepare five ideas for each one in advance so your brainstorming in case interviews sounds organized rather than improvised.

 

Tip #9: Get feedback from someone who has run energy cases

 

Self-practice cannot tell you that your segmentation was slow or your assumptions sounded unanchored. Working with a coach who has interviewed candidates for a sector practice surfaces those issues in one session instead of ten.

 

If you want to build the underlying case skills first, my case interview course covers the frameworks and structuring habits that every energy case sits on top of.

 

What Mistakes Should You Avoid in Energy Case Interviews?

 

Six mistakes account for most of the failed energy cases I have seen. Every one of them is avoidable with an hour of preparation.

 

• Structuring before segmenting: drawing a generic profit tree for a company that runs three different businesses under one roof

 

• Confusing capacity with energy: multiplying megawatts by a price per megawatt hour and producing an answer that is off by thousands

 

• Calling pipelines commodity-exposed: treating fee-based midstream revenue as if it moved with the oil price

 

• Applying private company logic to a utility: recommending price increases or cost cuts as if a regulator were not setting the terms

 

• Quoting profit without a price assumption: giving a single revenue figure when the answer changes completely at a different commodity price

 

• Waving off the transition as out of scope: ignoring the decarbonization angle when it is often the reason the client hired a consultant

 

That last mistake has become expensive. Energy clients are the ones funding the build-out, so a candidate who treats emissions and new-energy capital as a side topic misses what the work is actually about, which is a point the frameworks in a sustainability case interview handle well.

 

Fixing the price assumption habit is the highest-return hour you can spend. Interviewers in energy practices are listening for whether you understand that the client controls volume and cost but not price, and stating your assumption proves you do.

 

Beyond the sector layer, energy cases reward the same fundamentals as everything else. Practicing widely across industry-specific case interview formats builds the pattern recognition that lets you spot which archetype you are in within the first minute.

 

The single most useful thing you can do to prepare for an energy case interview is learn the value chain cold, then practice segmenting out loud before you structure. Do that consistently and the rest of the case is work you already know how to do.

 

Frequently Asked Questions

 

What is an energy case interview?

 

An energy case interview is a consulting case set in the oil and gas, power, utilities, or renewables sector. You segment the value chain first, identify which segment owns the problem, and then apply a standard framework inside that segment. The extra difficulty comes from commodity price exposure, regulated returns, and capital cycles that run 10 years or longer.

 

Do you need an energy background to pass an energy case interview?

 

No. Interviewers supply every number you need to solve the case. What they expect is that you understand roughly 10 terms and can tell the difference between a fee-based pipeline business and a price-exposed drilling business. Candidates from liberal arts and non-technical backgrounds pass energy cases every recruiting cycle.

 

How do you structure an oil and gas profitability case?

 

Ask which segment of the business is underperforming before you build any tree. Once you know whether the problem sits in upstream, midstream, or downstream, split revenue into realized price times volume and split costs into fixed and variable. State the commodity price assumption you are working from, because the same volume produces very different profit at different prices.

 

Which consulting firms ask energy case interview questions?

 

McKinsey, BCG, Bain, Deloitte, EY, Kearney, Oliver Wyman, and Accenture all run large energy or power practices and use sector cases. McKinsey splits its work into two separate practices, Oil and Gas and Electric Power and Natural Gas, so the case you get depends on which one you are interviewing for. Boutiques focused on energy and infrastructure use energy cases in nearly every round.

 

What is the difference between upstream, midstream, and downstream?

 

Upstream finds and produces oil and gas, so its revenue moves almost one for one with commodity prices. Midstream moves and stores hydrocarbons for a fee, which makes it look more like infrastructure than a commodity business. Downstream refines crude into gasoline, diesel, and jet fuel and earns the spread between product value and crude cost.

 

How long does it take to prepare for an energy case interview?

 

If you already have solid case fundamentals, two weeks of focused work is enough. Spend the first few days on the value chain and the metrics table, then run 6 to 8 practice cases set in energy. Candidates starting from zero on case interviews should budget 6 to 8 weeks total and treat the energy layer as the final week.

 

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