# Customer acquisition costCustomer acquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → in a market where switching is rare and slow
A UK energy supplier spends 45 pounds acquiring a customer through a price comparison website, 90 pounds through paid search, and 130 pounds through a door-to-door agent. Blend those three into one "CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition →" of, say, 70 pounds, and you have a number that is technically correct and strategically useless. It tells you nothing about which channel to cut, which to scale, or why your door knockers keep hitting quota while your margins quietly erode.
This is the trap in energy retail marketing. Unlike a subscription app where someone signs up in 90 seconds, energy switching runs on consideration cycles of 18 to 24 months in many mature markets. Customers get burned by a bad experience, sit on it for a year, then switch during a rate shock or a house move. That lag breaks the simple CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → math most marketers learned in faster-moving categories.
CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → (customer acquisition costcustomer acquisition costCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition →) is normally: total acquisition spend divided by number of customers acquired, in a given period.
The problem in energy: spend and acquisition don't happen in the same window. A comparison site click today might convert eight months later, after three more comparison site visits and two paid search sessions. Standard last-click attributionattributionA framework for assigning credit to the touchpoints that contributed to a conversion, so you can measure which channels and interactions actually drive results.View full definition → hands all the credit (and cost) to whichever channel touched the customer last, usually the comparison site at the moment of switching. Paid search and brand awarenessbrand awarenessThe degree to which your target audience recognises or recalls your brand, either prompted or unprompted. It measures how present your brand is in people's minds.View full definition → spend upstream look like they "did nothing," even though they built the consideration that made the final click possible.
Comparison sites (in the UK: Uswitch, MoneySuperMarket, Compare the Market; in Germany: Check24; in the US, deregulated markets like Texas use sites like Power to Choose, a state-run comparator) charge suppliers a fee per acquired customer, often structured as pay-per-switch. This fee is transparent and easy to count, which is exactly why it gets blamed or credited disproportionately.
Paid search and display costs are diffuse and hard to tie to a specific signed contract 14 months later, because most ad platforms report last-click or 7-to-30-day attributionattributionA framework for assigning credit to the touchpoints that contributed to a conversion, so you can measure which channels and interactions actually drive results.View full definition → windows, far shorter than the actual consideration cycle.
Door-to-door (D2D) agents are paid per acquisition or on commission, and D2D CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → looks deceptively low per contract signed, until you add the churn: D2D-acquired customers in several European markets show materially higher early cancellation rates than digitally self-selected customers, based on industry commentary from firms like Cornwall Insight, a UK energy market analysis firm. If half of them churn within 12 months, your true CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → per *retained* customer doubles.
Three adjustments turn blended CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → into something decision-useful.
1. Attribute over the full consideration window, not the click window.
Use multi-touch attributionmulti-touch attributionA method that distributes conversion credit across all marketing touchpoints in the customer journey, rather than crediting only the first or last interaction.View full definition → (crediting multiple touchpoints across the journey, not just the last one) with a lookback window matched to your actual sales cycle, 18 to 24 months, not the platform default of 30 days. Most marketing teams under-invest in this because it requires stitching together CRMCRMCustomer Relationship Management: software and strategy to manage and analyse customer interactions throughout their lifecycle.View full definition → (customer relationship managementcustomer relationship managementCustomer Relationship Management: software and strategy to manage and analyse customer interactions throughout their lifecycle.View full definition → software) data with ad platform data over a much longer horizon than e-commerce playbooks assume.
2. Segment CAC by channel AND by acquisition quality.
Don't just report CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → per channel. Report CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → per *retained* customer at 12 months per channel. This is the single highest-leverage fix.
3. Include the loaded cost, not just media spend.
True CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → = (media/agency fees + comparison site fees + D2D commissions + sales ops overhead + creative production) ÷ net customers acquired in the period. Many suppliers only count the comparison site fee or the D2D commission and ignore the internal team supporting both.
Say a mid-sized European supplier runs three channels in a quarter:
| Channel | Spend | Customers acquired | Raw CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → | 12-month retention rate (estimate) | CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → per retained customer |
|---|---|---|---|---|---|
| Comparison site | €200,000 | 4,000 | €50 | 85% | €59 |
| Paid search/display | €150,000 | 1,500 | €100 | 90% | €111 |
| Door-to-door | €300,000 | 3,000 | €100 | 55% | €182 |
Retention rates here are illustrative estimates for demonstration, not published figures, sector retention varies widely by market and supplier.
Raw CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → makes D2D look identical to paid search (100 euros each). Once you divide by the retained base instead of the raw acquired base, D2D CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → nearly doubles to 182 euros, the worst of the three, while the comparison site, often assumed to be a "commodity" channel with thin margins, actually delivers the cheapest retained customer.
The formula:
CAC_retained = Total loaded channel spend / (Customers acquired × 12-month retention rate)This single adjustment is usually enough to reallocate a marketing budget.
Energy retail CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → benchmarks are not as standardized or publicly reported as, say, SaaS (software-as-a-service) CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → benchmarks, and suppliers treat these figures as commercially sensitive. Treat the following as directional, sector-informed estimates, not audited figures:
Low switching rates are precisely why CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → discipline matters more here than in fast-churn categories: you get far fewer bites at the apple per customer, so misallocating spend across channels compounds for years, not months.
Knowledge check
1. Why is a single blended CAC number considered strategically useless for an energy supplier's marketing decisions?
2. What is the core reason standard CAC math (spend divided by acquisitions in a period) breaks down in energy retail?
3. Why might last-click attribution systematically overstate the value of comparison sites relative to upstream channels like paid search or brand advertising?
4. Select ALL correct answers about why energy switching behavior differs from fast-converting categories like subscription apps.
Select all the correct answers.
5. Select ALL correct answers about pay-per-switch fees charged by comparison sites.
Select all the correct answers.
CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → only means something next to customer lifetime valuecustomer lifetime valueLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition → (LTVLTVLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition →: total gross margingross marginGross margin is the share of revenue left after subtracting the direct cost of producing goods or services, expressed as a percentage of revenue.View full definition → a supplier expects from a customer over the relationship). In a category with 18 to 24 month consideration cycles, LTVLTVLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition → calculations must assume long holding periods, often 3 to 5 years, because switching friction (energy switches, standing charge structures, contract exit fees where regulation allows them) works in the incumbent's favor once someone is acquired.
A rough LTVLTVLifetime Value: the total revenue (or profit) a customer generates throughout their entire relationship with your business.View full definition →:CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → target commonly cited across subscription-style and contract-based industries is 3:1 as a health benchmark, though this originates in SaaS commentary and should be treated as a loose reference point, not an energy-sector standard. If your D2D channel's CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow. per retained customer is 182 euros and average annual per residential customer is, say, 60 to 90 euros (a plausible estimate depending on market and tariff type), you need multiple years of retention just to break even on that one channel, before overheads.
This is why churn and retention metrics (covered elsewhere in this module) are not a separate topic from CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition →. They are the denominator that makes CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → honest.
🎬 [VIDEO: "Customer Acquisition CostCustomer Acquisition CostCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → Explained" - youtube.com/results?search_query=customer+acquisition+cost+explained - a primer on CACCACCustomer Acquisition Cost (CAC) is the total sales and marketing spend divided by the number of new customers gained in a period. It measures how efficiently you grow.View full definition → fundamentals and common measurement pitfalls, useful as a base before applying the energy-sector adjustments above]