Example Energy Trading Questions

Let's frame this with the single question that separates the two: who decides the price, and how many companies are allowed to sell?

In a regulated market, one entity — usually a government-owned or government-appointed utility — controls the whole chain: generation (making the power), transmission (the high-voltage lines that move it long distances), and distribution (the local wires that reach your home). Because that utility is effectively a monopoly, you can't let it charge whatever it wants, so a regulator (a government body) sets the prices it is allowed to charge. The deal is simple: the utility gets a protected market with no competitors, and in return the regulator caps its prices to protect consumers. You, the customer, have one provider and no choice — but you also get stable, predictable prices.

In a deregulated market, that monopoly is broken open. Multiple companies are allowed to generate and sell energy, and instead of a regulator stamping the price, the price is set by competition — supply and demand between rival sellers. As a customer you can now shop between providers and pick the plan you like. The aim of deregulation is to use that competition to push prices down and force companies to run more efficiently and innovate, since they have to fight to win and keep your business.

There is one crucial point to land: deregulated does not mean unwatched. Even when the market sets prices, you still need robust oversight to make sure companies compete fairly and don't manipulate the market — for example, by deliberately withholding supply to drive prices up. So the regulator doesn't disappear in a deregulated market; it stops setting prices and instead polices the rules of the game.

Sanity check

Put yourself in a customer's shoes. In a regulated market you have exactly one electricity provider, a price set by the regulator, and no decision to make — simple and stable, but no choice and no competitive pressure to drive prices down. In a deregulated market you can compare several providers, switch to a cheaper or greener plan, and benefit from companies competing for you — but you also take on more price volatility, and the system leans on oversight to keep that competition honest. Same electricity, two completely different market structures behind the socket.

So, regulated means one overseen monopoly with prices set by a regulator, and deregulated means many competing sellers with prices set by the market — that contrast is the whole answer in a nutshell!

Let's start with the word "bond", because the green part only makes sense once that's clear. A bond is just a loan in tradeable form. When a company issues a bond, investors hand over cash today, and in return the company promises to pay them a fixed stream of interest (the coupon) over some years and then repay the original amount (the principal) at the end. The investor can sell that promise to someone else before it matures. That's the whole machine: you borrow money from the market instead of from a single bank.

A green bond is exactly that same machine with one extra promise bolted on: the issuer commits that the money raised will only be spent on projects with an environmental benefit. Building a wind farm, a solar plant, or a hydro facility all qualify. Nothing about the financial mechanics changes. You still pay a coupon, you still repay the principal, and if the issuer goes bankrupt a green bondholder stands in exactly the same queue as an ordinary bondholder. The "green" is a ring-fence on the use of proceeds, not a different kind of security.

So why would the wind-farm developer bother with the label instead of issuing plain vanilla bonds? Three reasons worth saying out loud in an interview.

• It widens the pool of buyers
  a lot of large investors, pension funds, insurers, sovereign funds, now run mandates that force them to put a slice of their money into things labelled sustainable. A green label puts your bond on their shopping list. More potential buyers competing for the same bond means you can usually borrow a little more cheaply. That small discount in the coupon, the price of borrowing, is sometimes nicknamed the "greenium".
• It matches the cash to the asset
  a wind farm is a long-lived, predictable, capital-heavy asset. Once it is built it spins off steady revenue for twenty years. That is a natural fit for bond investors who want a long, steady stream of coupons, so the financing and the project line up neatly.
• It signals commitment
  issuing under a recognised standard tells the market you are serious about the environmental side, which can matter for your reputation with customers and regulators.

Now the part most candidates forget: what can go wrong with the label. The core risk is greenwashing, which means slapping a green sticker on money that quietly funds something that isn't really green, or that you would have built anyway. Because there is no single global rulebook for what counts as a "green project", the definition has soft edges, and an investor has to trust the issuer's word. That is why credible green bonds come with two safeguards: an independent third party reviews the framework before issuance, and the issuer publishes regular reports showing exactly where the money went and what emissions it avoided. Many issuers align to a published set of voluntary guidelines such as the Green Bond Principles to give investors a common reference point. If you skip that verification, the greenium evaporates the moment investors suspect the label is hollow.

A real example you can name plainly: the European Investment Bank, the EU's public lending arm, was the first issuer of a green bond back in 2007 (it called it a Climate Awareness Bond) and has since raised the equivalent of tens of billions of euros this way to fund renewable energy and efficiency projects across Europe. The market it kicked off has grown into one issuing hundreds of billions of dollars of green bonds a year.

So the honest interview answer is: a green bond is a normal bond whose cash is ring-fenced for environmental projects; for a wind-farm developer it broadens the buyer base and can shave the borrowing cost a touch, but it only works if you can credibly prove the money actually went where you said, otherwise the whole advantage collapses into a greenwashing accusation!

Let's be precise here, because "supply chain disruption" is a vague phrase that actually covers several distinct mechanisms. An interviewer wants to see you break it into channels rather than waving at it.

A supply chain is just the whole sequence of steps that gets something from raw material to the end user, including mining, manufacturing, shipping, and storage. When any link breaks, the effect on energy markets flows through three separate channels.

Channel 1: moving the energy itself

The most direct hit is when the fuel can't physically get from where it's produced to where it's needed. If a war, a sanction, a closed shipping lane, or a damaged pipeline stops oil or gas reaching its buyers, you get a local shortage even though the world still has plenty of the stuff overall. Buyers in the cut-off region bid up the price to attract supply from somewhere else, and that costs more because it now has to travel further or by a more expensive route.

A clean way to see this: imagine a refinery that normally gets crude by a short pipeline for, say, 2 dollars a barrel of transport cost. If that pipeline goes down and the crude must instead come by tanker from across the world at 7 dollars a barrel, that 5-dollar gap lands straight on the delivered price, with no change in the underlying oil price at all. The disruption shows up as a transport-cost spike. This is also why traders watch chokepoints and pipeline outages so closely, a logistics problem becomes a price problem almost instantly.

Channel 2: the equipment to build energy assets

This channel is subtler and often more important for the long run. Energy isn't just fuel, it's the hardware that produces it: wind turbine blades, solar panels, transformers, steel for rigs and pipelines, and the specialised chips and magnets inside them. A lot of this gear is made by only a handful of factories in a few countries, so it's concentrated and fragile. When the supply chain for these components seizes up, you can't build new energy capacity on schedule.

The consequence is that projects get delayed and more expensive. A solar farm waiting a year for panels, or a grid upgrade waiting on transformers that now have multi-year lead times, costs more and comes online later. Because renewables are especially equipment-heavy (their whole cost is the up-front build, since the sun and wind are free), they're particularly exposed to this channel, which means a component shortage can directly slow the energy transition.

Channel 3: the financing knock-on

The third channel is financial and feeds off the first two. When supply chains are unreliable, the timing and cost of a project become uncertain, and uncertainty makes lenders nervous. If a bank can't be sure a wind farm will be built on time and on budget, it demands a higher interest rate to compensate for the risk, or declines to lend at all. Higher financing costs make capital-intensive energy projects (the ones with big up-front spending) less attractive, so some get delayed or cancelled outright. So a physical bottleneck in factories quietly turns into a financial bottleneck in the capital that funds new energy.

Sanity check: which channel bites when

A quick consistency test. Channel 1 (fuel logistics) is fast and shows up as an immediate price spike, exactly what you saw when shipping routes were threatened and crude had to be rerouted. Channels 2 and 3 (equipment and financing) are slow-burn, showing up as delayed projects and thinner pipelines of new capacity months or years later. So the timescale of the effect tells you which channel you're looking at: a sudden price jump points to logistics, while a stalled build-out points to equipment and financing. The three channels don't compete, they stack, which is why a broad disruption can raise today's prices and choke tomorrow's supply at the same time.

So the takeaway: don't say "supply chains went wrong and prices rose", say which chain broke, moving the fuel, building the kit, or funding the project, because each one hits energy markets through a different door!