Study for the CEP by practicing offer comparison, not memorization of definitions. The applied skill is decomposing a supply offer into its price mechanism, the risks it transfers to you, and the contract terms that can erase an apparent price advantage. Work through load-profile scenarios, build a comparison table you can reproduce from memory, and score yourself with a rubric that checks whether you identified the risk each structure assigns to the buyer.
Fixed, indexed, and hybrid supply structures: what each one actually transfers to you
A fixed-price product transfers most price risk to the supplier; a fully indexed product keeps it with the buyer; hybrid structures such as block-and-index split the risk between both parties.
In a fixed-price supply agreement, the buyer pays a set unit rate for the term, so the supplier carries the risk that wholesale prices rise and the buyer carries the risk that they fall. In a fully indexed product, the bill floats with a published market index plus a stated adder, so the buyer keeps both upside and downside. Neither is universally better; each is a bet on volatility.
Hybrid structures exist because many buyers want partial certainty. A block-and-index product locks a specified percentage of expected volume at a fixed price and prices the remainder at the index. A collar sets index-based boundaries on the floating portion. When studying, practice describing each structure by two features: which volume is hedged, and which party gains if the market moves in each direction.
| Structure | Price mechanism | Risk borne by buyer | Fits best when |
|---|---|---|---|
| Fixed price | One set rate for the full term and volume | Opportunity cost if prices fall | Budget certainty outranks savings potential |
| Full index | Published index plus stated adder | All market price volatility | Buyer can absorb swings or has flexibility in usage timing |
| Block-and-index | Part of volume fixed, remainder at index | Volatility on unhedged share only | Buyer wants partial protection and some market exposure |
| Collar / cap | Index price bounded by agreed limits | Volatility only within the band | Buyer accepts bounded uncertainty to avoid a fixed premium |
Why the headline rate misleads: load factor, demand charges, and all-in cost
A unit rate alone cannot rank offers, because the bill depends on load factor, demand-related charges, and any pass-through costs. All-in cost per unit, computed from the customer's actual profile, is the comparison basis.
Load factor, the ratio of average demand to peak demand, changes what a given rate is worth. A flat, high-load-factor profile lets a supplier serve volume efficiently, so competitive fixed rates are achievable. A spiky, low-load-factor profile forces the supplier to hedge capacity for peaks that occur rarely, which tends to show up either as a higher rate or as separate demand charges.
This is why a comparison exercise should always rebuild the bill: multiply each offer's energy rate by the profile's consumption, add demand charges applied to peak kW, and add any fixed monthly charges or pass-through items. Two offers with the same quoted rate can differ meaningfully once demand charges and profile shape are included. Practice this arithmetic until ranking offers from a rate sheet feels mechanical.
Worked scenario: choosing between fixed and block-and-index for a manufacturing load
A buyer with moderate volatility tolerance comparing a fixed offer against a block-and-index offer should rank them by all-in expected cost under more than one price path, not by the quoted rate alone.
Scenario: a plant consumes steadily year-round. Supplier A offers a fixed rate for the term. Supplier B offers block-and-index, fixing half the expected volume and floating the rest at an index plus an adder. The tempting mistake is to compare A's fixed rate with only B's fixed block rate, or to compare both against a single guessed future price and declare a winner.
The better decision is to model at least two market paths: one where the index rises above the fixed block level and one where it falls below. Under rising prices, B's floating half costs more, so A wins; under falling prices, B wins. The decision then rests on the buyer's tolerance for the floating share, not on a forecast. Why it matters: a ranking that only holds on one assumed price path has hidden a risk decision inside an arithmetic exercise, and stating the price path dependence is what turns the calculation into a defensible procurement recommendation.
Basis, heat rate, and shape risk: three related but distinct risk terms
Basis risk is a location spread, heat rate risk links gas prices to power prices, and shape risk comes from how usage is distributed over time. Each affects a different kind of offer.
Basis is the difference between a reference hub price and the price at the delivery point. A product priced as hub plus basis transfers that spread to the buyer, so the same hub quote can produce different delivered costs in different regions. Heat rate converts fuel price into an implied electricity price; offers indexed to a gas hub with a stated heat rate expose the buyer to both fuel price and the efficiency assumption embedded in that number.
Shape risk arises when your consumption pattern does not match the flat-shaped volume a supplier might prefer: heavy summer cooling, weekend shutdowns, or seasonal production all create shape. Offers that hedge a flat block leave your off-shape volume exposed. When studying, practice assigning each offer clause to the risk it creates: location spread, fuel-to-power conversion, or usage shape. That one-to-one mapping is more durable than memorizing definitions in isolation.
Contract clauses that change value: bandwidth, swing, settlement, and exit terms
Clauses governing volume tolerance, usage variation, settlement of differences, and early termination can add cost or remove risk. Reading them is part of evaluating an offer, not legal housekeeping.
Volume-related clauses determine what happens when actual usage deviates from expectations. A bandwidth clause defines an allowed range around forecast volume; usage outside it may be repriced. Swing provisions cover month-to-month variation. If a facility curtails production, loses a tenant, or adds equipment, these clauses determine whether the buyer owes difference charges, and a cheap headline rate can be offset by a narrow bandwidth.
Settlement and exit clauses allocate different risks. Daily versus monthly settlement changes how quickly floating prices hit the invoice. Early-termination provisions may liquidate the supplier's hedge position at the buyer's expense, which can be large if the market has moved. In practice exercises, read each clause and record one sentence: who pays, when, and under what trigger. An offer is not fully evaluated until every such sentence is written.
Worked scenario: an RFP comparison where the cheapest-looking bid is not the cheapest
When evaluating multiple RFP responses, reprice each bid onto the customer's actual load and bill of market data before ranking. A bid with pass-through items must be expanded, not taken at face value.
Scenario: a buyer issues an RFP and receives two responsive bids. Bid 1 quotes a single all-in rate. Bid 2 quotes a lower energy rate but lists several charges as pass-through at cost, including a capacity-related component and a balancing item. The plausible mistake is ranking the bids by the quoted energy rate and shortlisting Bid 2 as the clear leader.
The better decision is to build both bills from the same twelve-month load history: apply each bid's rates and fixed charges, and estimate the pass-through items from the customer's own recent bills or published data where available. Bid 2 may still win, but only after the pass-through exposure is quantified and compared with the buyer's risk tolerance. Why it matters: unquantified pass-throughs shift volatility to the buyer, so accepting them without an estimate silently converts a fixed-price decision into an indexed one.
A practice routine that builds comparison skill: exercises, rubric, and a study sequence
Build skill by writing your own offer sheets from public market data, comparing them against your own load profile, and scoring your analysis against a fixed rubric until every risk category is addressed unprompted.
Practical exercise: take a simple hypothetical load, for example a facility using a steady monthly volume with a seasonal peak. Draft two offer sheets yourself: one fixed, one block-and-index with stated bandwidth and pass-through items. Then compare them across three market paths (index up, flat, down). Expected observations: the fixed offer wins only on the rising path, the indexed offer's advantage shrinks as the adder grows, and a narrow bandwidth clause imposes a cost in at least one path where your hypothetical volume deviates. If you did not notice the bandwidth effect, repeat the exercise with the clause made stricter.
Self-check rubric, scored one to five per item, as learning milestones rather than pass predictions: (1) Can you state, for each product structure, which party holds the price risk? (2) Can you compute all-in cost from a rate sheet plus a load profile? (3) Can you map basis, heat rate, and shape risk to the clauses that create them? (4) Can you identify the trigger, payer, and timing in a termination or difference clause? (5) In a two-bid scenario, can you articulate why the ranking could flip under a different price path?
Adaptable preparation sequence: first week, master the product structures and rebuild the comparison table from memory. Second week, do the load-profile arithmetic on your own drafts until the ranking logic is automatic. Third week, write out contract clauses and the one-sentence risk allocation for each. Final phase, run full timed scenarios: read a case, produce a ranked recommendation, and state the condition under which your ranking would reverse. Readiness checks before the exam: you can complete the rubric at level four or higher without notes, reproduce the decision table unprompted, and explain both worked scenarios aloud in under three minutes each.
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.