Your electricity bill is the financial document you receive every month but probably never fully understand. It is filled with line items, abbreviations, and charges that seem designed to confuse. But understanding your bill is essential — both for evaluating whether solar makes sense and for maximizing your savings after installation.
At ProGreen Solar, the first thing we do with every prospective customer is analyze their electricity bill in detail. This guide walks you through every line item on a typical Xcel Energy bill (Colorado's largest utility), explains what each charge means, and shows how solar panels affect each one.
The Big Picture: Where Your Money Goes
Before diving into line items, here is where the average Colorado residential electricity dollar goes:
| Component | Percentage | What It Pays For |
|---|---|---|
| Energy supply | 35-45% | Generating the electricity |
| Distribution | 25-30% | Local power lines, transformers, meters |
| Transmission | 10-15% | High-voltage lines from power plants |
| Riders and adjustments | 5-10% | Fuel costs, renewable programs, efficiency programs |
| Taxes and fees | 5-8% | City franchise fees, state regulatory fees |
Understanding this breakdown matters because solar eliminates or reduces some of these charges but not others. Let us go line by line.
Line-by-Line Breakdown
1. Service and Facility Charge
What it is: A fixed monthly fee charged to every customer regardless of how much electricity you use. It covers the cost of maintaining your connection to the grid — your meter, the service line to your home, billing, and customer service.
Typical amount: $9.00 to $12.00 per month for residential customers.
How solar affects it: It does not. This charge remains the same whether you use 1,000 kWh or zero kWh. Even solar customers who generate more than they consume pay this fixed charge. It is the cost of being connected to the grid.
Note: Some utilities have attempted to increase this charge for solar customers. Colorado has so far resisted significant fixed charge increases targeting solar homes, but it is worth monitoring as policies evolve.
2. Energy Charge (kWh Charge)
What it is: The core charge for the electricity you actually consume. It is calculated by multiplying your usage in kilowatt-hours by the applicable rate per kWh.
Typical rate: $0.05 to $0.07 per kWh for the generation component. This is lower than most people expect because many other charges get added on top.
How to read it: Your bill shows total kWh consumed during the billing period. For flat-rate customers, it is a simple multiplication. For TOU customers, usage is broken into time periods with different rates.
How solar affects it: This is the primary charge that solar reduces. Every kWh your solar panels produce is a kWh you do not buy from Xcel. If you produce more than you consume, the surplus is credited through net metering. Understanding your kWh usage is the starting point for sizing a solar system.
3. Demand Charge (if applicable)
What it is: A charge based on your highest power draw during any 15-minute interval in the billing period. While energy charges measure total consumption (how many kWh), demand charges measure peak power (how many kW at once).
Typical rate: $2 to $5 per kW of peak demand for residential customers on demand-rate plans. Commercial customers pay much more — $10 to $20+ per kW.
Example: If you run your air conditioner (3 kW), electric dryer (5 kW), oven (4 kW), and EV charger (7 kW) simultaneously, your demand is 19 kW. Even if this only happens for 15 minutes all month, you pay the demand charge on 19 kW.
How solar affects it: Solar alone does not significantly reduce demand charges because your peak demand usually occurs in the evening when solar production has declined. However, a solar battery system can dramatically reduce demand charges by discharging during peak demand periods.
Who pays demand charges: Not all residential customers are on demand-rate plans. Check your rate code — if it includes the letter "D" or "demand" in the description, you have demand charges. Commercial customers almost always have demand charges.
4. Transmission Charge
What it is: The cost of transporting electricity over high-voltage transmission lines from power plants to your local distribution system. Think of transmission as the interstate highway of electricity, while distribution is the local streets.
Typical rate: $0.01 to $0.02 per kWh.
How solar affects it: Reduced proportionally to your reduced grid consumption. When you use solar-generated electricity, it does not travel over the transmission system, so you avoid this charge on those kWh.
5. Distribution Charge
What it is: The cost of delivering electricity from the local substation to your home through neighborhood power lines, transformers, and your meter. This funds maintenance, tree trimming, storm restoration, and local infrastructure upgrades.
Typical rate: $0.02 to $0.04 per kWh, plus potentially a demand-based component.
How solar affects it: Partially reduced. You pay distribution charges only on electricity you draw from the grid. When consuming your own solar production, you avoid this charge. However, some utilities are introducing minimum distribution charges for solar customers, arguing that solar homes still rely on the distribution system for backup.
6. Electric Commodity Adjustment (ECA)
What it is: An adjustment that accounts for the difference between the forecasted cost of fuel (natural gas, coal, wind, solar) used to generate your electricity and the actual cost. When fuel prices spike, the ECA increases; when they drop, it decreases.
Typical range: -$0.005 to +$0.02 per kWh. It fluctuates monthly and quarterly.
How solar affects it: Reduced proportionally to your reduced grid consumption. This is one of the variable charges that makes predicting future electricity costs difficult — and one reason solar's fixed cost is financially attractive.
7. Renewable Energy Standard Adjustment (RESA)
What it is: Funds Colorado's Renewable Energy Standard, which requires utilities to generate a certain percentage of electricity from renewable sources. This charge pays for utility-scale solar, wind, and other renewable projects.
Typical rate: $0.005 to $0.015 per kWh.
How solar affects it: You still pay this on grid-consumed kWh, but the charge is modest. And there is a satisfying irony: by installing solar, you are doing your part for renewable energy more directly and efficiently than this charge ever could.
8. Demand Side Management (DSM) Charge
What it is: Funds energy efficiency programs including rebates for ENERGY STAR appliances, insulation, smart thermostats, and other efficiency improvements. You may have already benefited from these programs — the rebates come from this charge on everyone's bill.
Typical rate: $0.01 to $0.015 per kWh.
How solar affects it: Reduced proportionally to reduced grid usage. Before going solar, consider taking advantage of the efficiency rebates these funds provide. See our guide on reducing your electric bill before going solar.
9. Clean Air-Clean Jobs Act Charge
What it is: Funds the conversion of coal-fired power plants to cleaner natural gas and renewable generation under Colorado's Clean Air-Clean Jobs Act.
Typical rate: $0.002 to $0.005 per kWh.
How solar affects it: Minimal charge, reduced proportionally with solar.
10. Taxes and Franchise Fees
What it is: Various taxes including city franchise fees (a fee the utility pays to the city for using public rights-of-way, passed through to customers), state regulatory fees, and other governmental charges.
Typical total: 5 to 8 percent of your total bill, or $5 to $15 per month for average residential customers.
How solar affects it: These are typically calculated as a percentage of your total charges, so they decrease proportionally as solar reduces your other charges.
Understanding Time-of-Use (TOU) Rate Structures
If you are on a TOU plan (or considering switching), your energy charge section looks different. Instead of a single rate, your usage is broken into time periods:
Xcel Energy Residential TOU Rates (Simplified)
Summer (June through September):
| Period | Hours | Rate |
|---|---|---|
| Off-peak | 9 PM - 1 PM | $0.08-$0.10/kWh |
| Mid-peak | 1 PM - 3 PM, 7 PM - 9 PM | $0.12-$0.14/kWh |
| On-peak | 3 PM - 7 PM weekdays | $0.18-$0.28/kWh |
Winter (October through May):
| Period | Hours | Rate |
|---|---|---|
| Off-peak | 9 PM - 1 PM | $0.07-$0.09/kWh |
| Mid-peak | 1 PM - 3 PM, 7 PM - 9 PM | $0.10-$0.12/kWh |
| On-peak | 3 PM - 7 PM weekdays | $0.12-$0.18/kWh |
How TOU Affects Solar Strategy
On a flat rate, every solar kWh has the same value regardless of when it is produced. On a TOU plan, solar kWh produced during peak hours are worth two to three times more than those produced off-peak.
The challenge: solar production peaks at midday (off-peak on most TOU schedules), while the highest-value peak hours are late afternoon and evening when production is declining. This mismatch reduces the value of solar under TOU rates compared to flat rates — unless you have battery storage.
With a battery, you can store midday solar production and discharge during expensive peak hours, capturing the full value spread. This is one reason battery economics are so strong for TOU customers. Learn more about smart energy management strategies for TOU optimization.
Should You Switch to TOU?
The answer depends on your lifestyle and habits:
TOU favors you if:
- You are home during the day and can run major loads midday
- You have a battery to shift solar to peak hours
- Your heaviest usage is overnight (EV charging, pool pumps)
- You can avoid running major appliances during peak hours
Flat rate favors you if:
- Your household runs most appliances in the evening
- You cannot shift usage patterns
- You do not have (or plan) battery storage
- Your solar system is small relative to your usage
We help every customer evaluate the optimal rate structure during the solar design process.
How to Read Your Bill for Solar Sizing
When you bring us your electricity bill for a solar consultation, here is what we look at:
12-month usage history. Your bill includes a graph or table showing monthly kWh consumption for the past 12 months. This seasonal pattern determines how large your solar system needs to be. Summer AC usage and winter heating loads create peaks that we account for.
Average daily kWh. Total monthly kWh divided by billing days gives your average daily consumption. This is the number your solar system needs to match or exceed.
Rate structure. Your current rate plan determines the value of each solar kWh and influences system design decisions including battery recommendations.
Peak demand (if applicable). If you have demand charges, your peak demand indicates whether battery storage would save you money through peak shaving.
Account number and service address. We need these to access your usage data from Xcel Energy (with your permission) for precise system modeling.
Sample Bill Analysis
Here is what a typical Xcel Energy bill looks like before and after solar:
Before Solar (Flat Rate, September)
| Line Item | Amount |
|---|---|
| Service and Facility Charge | $10.36 |
| Energy Charge (950 kWh x $0.058) | $55.10 |
| Transmission ($0.015 x 950) | $14.25 |
| Distribution ($0.032 x 950) | $30.40 |
| ECA ($0.008 x 950) | $7.60 |
| RESA ($0.010 x 950) | $9.50 |
| DSM ($0.012 x 950) | $11.40 |
| Clean Air charge ($0.003 x 950) | $2.85 |
| Taxes and fees (6%) | $8.49 |
| Total | $149.95 |
After Solar (7 kW System, Net Usage 100 kWh)
| Line Item | Amount |
|---|---|
| Service and Facility Charge | $10.36 |
| Energy Charge (100 kWh x $0.058) | $5.80 |
| Transmission ($0.015 x 100) | $1.50 |
| Distribution ($0.032 x 100) | $3.20 |
| ECA ($0.008 x 100) | $0.80 |
| RESA ($0.010 x 100) | $1.00 |
| DSM ($0.012 x 100) | $1.20 |
| Clean Air charge ($0.003 x 100) | $0.30 |
| Net metering credit | -$0.00 |
| Taxes and fees (6%) | $1.45 |
| Total | $25.61 |
Monthly savings: $124.34. Annual savings: approximately $1,492.
This example shows how solar reduces every usage-based charge while the fixed service charge remains. The total effective electricity rate drops from $0.158 per kWh (all-in) to near zero for solar-generated kWh.
What Your Bill Does Not Show You
Several important factors are invisible on your bill:
Rate increase trajectory. Your bill shows today's rates, not tomorrow's. Colorado electricity rates have increased an average of 3 to 5 percent annually for the past decade. Those rate increases compound, making future bills significantly higher than today's — and making solar's fixed cost increasingly valuable over time.
Carbon intensity. Your bill does not show the environmental cost of the electricity you consume. Xcel Energy's grid mix includes natural gas, coal, wind, and solar in varying proportions. Each kWh you offset with solar eliminates approximately 0.9 to 1.1 pounds of CO2.
Peak demand impact. Unless you are on a demand rate, your bill does not show your peak power draw. But this information is available through Xcel Energy's online portal and can reveal opportunities for load management savings.
Take Control of Your Energy Costs
Understanding your electricity bill is the first step toward taking control of your energy costs. The second step is generating your own electricity with solar panels — converting unpredictable, ever-increasing utility charges into a fixed, predictable cost that declines to zero over time.
Grab your most recent Xcel Energy bill and use our solar calculator to see exactly how solar would change every line item. Or call us at (303) 484-1410 and we will walk through your bill with you, identify opportunities for savings, and design a solar system that minimizes what you pay Xcel Energy each month. The consultation is free, and so is the education.
