How Demand Charges Affect Commercial Solar Savings in Telangana
Commercial rooftop solar can significantly reduce the electricity purchased from the grid. However, many Telangana businesses are surprised when their total electricity bill does not fall by the same percentage as their grid-energy consumption.
The main reason is that a commercial electricity bill can contain more than an energy charge. High-tension commercial consumers may also pay demand charges based on their billing demand in kilovolt-amperes, or kVA.
Solar panels primarily reduce grid-energy consumption during daylight hours. They reduce demand charges only when solar generation lowers the facility’s highest grid demand during the relevant billing period—and even then, minimum billing-demand conditions may continue to apply.
Understanding this distinction is essential when estimating commercial solar savings, choosing a solar system capacity and calculating project payback.
What Are Demand Charges?
Demand charges represent the cost associated with the highest level of electrical capacity a business requires from the grid.
An energy charge measures how much electricity a facility consumes over time. It is generally billed in kilowatt-hours or kilovolt-ampere-hours.
A demand charge, by contrast, is based on how much power the facility draws at its highest measured demand level.
Consider two businesses that each consume 50,000 units during a month:
Business A maintains a relatively stable electrical load.
Business B operates several large machines simultaneously for a short period.
Although their total energy consumption is identical, Business B may record a higher maximum demand because its electricity use is more concentrated. It may therefore incur higher demand-related charges.
Energy Charges vs Demand Charges
| Bill component | What it measures | Can commercial solar reduce it? |
|---|---|---|
| Energy charge | Total grid electricity consumed during the billing period | Usually, when solar offsets grid imports |
| Demand charge | Billing demand determined under the applicable tariff | Only when solar lowers the relevant grid-demand peak |
| Fixed or customer charge | Charge associated with the service connection | Usually not |
| Time-of-Day charge | Energy used during specified time blocks | Mainly during solar-generation hours |
| Power-factor-related billing | Relationship between useful and reactive power | Requires coordinated power-factor management |
This distinction is why a solar feasibility study should model both energy savings and demand savings. Businesses can review COP Energy’s commercial solar solutions before requesting a site-specific assessment.
Telangana’s Commercial HT Tariff Framework
Under Telangana’s Retail Supply Tariff for FY 2026–27, HT-II(A) applies to various high-tension commercial and non-domestic consumers, including shops, offices, hospitals, hotels, restaurants, theatres, warehouses and similar premises.
For HT-II(A), the published demand charge is ₹500 per kVA per month of billing demand. The normal energy charge varies by supply voltage. The tariff also applies Time-of-Day rates, with higher energy charges during morning and evening peak periods and a daytime incentive from 10:00 a.m. to 6:00 p.m. TGERC Retail Supply Tariff Order FY 2026–27
These rates and rules can change through subsequent tariff orders. Every commercial solar proposal should therefore use the consumer’s current bill and the latest applicable TGERC schedule.
What Is Billing Demand?
Billing demand is not necessarily the same as the maximum demand shown on a meter.
For HT-II(A) commercial consumers in Telangana, the FY 2026–27 order states that billing demand is the higher of:
Maximum demand recorded during the month, or
80% of contracted demand
The order also provides that energy charges are based on actual energy consumption or 25 kVAh per kVA of billing demand, whichever is higher. TGERC Retail Supply Tariff Order FY 2026–27
This 80% contracted-demand floor is particularly important when analysing how much a commercial solar installation can save.
How Commercial Solar Affects Demand Charges
Solar reduces a facility’s grid demand only while the system is generating electricity.
A simplified relationship is:
Grid demand = Facility load − Solar output
Suppose a commercial building requires 300 kW at noon while its solar system is producing 120 kW. Ignoring power factor and other electrical effects, the grid may supply approximately 180 kW during that period.
That reduction can lower maximum demand if:
The facility’s monthly peak occurs during solar-generation hours.
The solar system is producing sufficiently at that moment.
No higher grid-demand peak occurs at another time.
The revised recorded demand remains above the tariff’s minimum billing-demand floor.
If the highest demand occurs in the evening, early morning or during cloudy conditions, rooftop solar may produce little or no demand-charge reduction.
Example of Demand-Charge Savings
Consider an illustrative HT commercial consumer with:
Contracted demand: 500 kVA
Demand charge: ₹500 per kVA per month
Recorded maximum demand before solar: 480 kVA
Recorded maximum demand after solar: 420 kVA
Before solar
Billing demand is the higher of:
Recorded demand: 480 kVA
80% of contracted demand: 400 kVA
Therefore:
Billing demand = 480 kVA
480 × ₹500 = ₹2,40,000 per month
After solar
Billing demand is the higher of:
Recorded demand: 420 kVA
Minimum billing-demand floor: 400 kVA
Therefore:
Billing demand = 420 kVA
420 × ₹500 = ₹2,10,000 per month
The indicative demand-charge saving would be:
₹2,40,000 − ₹2,10,000 = ₹30,000 per month
This excludes taxes, duties, energy charges and other bill components.
What if solar lowers recorded demand to 350 kVA?
The billing demand would still be 400 kVA because 80% of the 500 kVA contracted demand is higher than the recorded demand.
Therefore:
400 × ₹500 = ₹2,00,000 per month
Once recorded demand falls below the contractual floor, additional solar-related demand reduction does not necessarily produce additional demand-charge savings unless the contracted-demand arrangement is formally revised, where permitted.
This is why solar savings must be modelled against both recorded demand and contracted demand.
When Solar Is Most Effective at Reducing Demand Charges
Commercial solar has the strongest demand-reduction potential when electricity consumption and solar generation occur at the same time.
Suitable load profiles may include:
Shopping malls operating heavily during the day
Hospitals with substantial daytime cooling loads
Hotels with daytime common-area and HVAC consumption
Educational institutions operating during daylight hours
Offices with daytime air-conditioning and IT loads
Warehouses with daytime material-handling equipment
Retail centres with steady daytime consumption
Function halls with daytime events
Cold-storage facilities with continuous loads
The customer’s actual interval load data must be analysed. Industry type alone cannot confirm whether solar will reduce maximum demand.
When Solar May Not Reduce Demand Charges Significantly
Evening demand peaks
A hotel, shopping centre, theatre or function hall may record its highest demand after sunset. Solar panels cannot directly reduce a late-evening grid peak.
Sudden equipment start-up
Large motors, pumps, compressors, chillers and lifts can create short high-load periods. If these events establish the recorded maximum demand, energy savings from solar may not translate into demand savings.
Cloud-related fluctuations
Solar generation can fall quickly during cloud cover while the building load remains high. The grid then supplies the shortfall, potentially creating a new demand peak.
Seasonal load changes
A commercial facility may experience its highest demand during months with heavy cooling requirements or during a particular operating season. Annual average data can hide these critical monthly peaks.
Minimum billing-demand conditions
Even when solar reduces recorded demand, the electricity bill may continue to use the minimum percentage of contracted demand prescribed by the tariff.
Poor power factor
Solar primarily supplies active power. The relationship between kW and kVA means poor power factor can keep the recorded kVA demand comparatively high.
A facility should manage reactive power carefully and ensure that capacitor banks, automatic power-factor correction systems and solar inverters are properly coordinated.
Why Solar Generation Alone Cannot Predict Savings
A solar installer may estimate how many units a system will generate annually. That figure is important, but it does not reveal whether the installation will reduce maximum demand.
Two buildings receiving similar solar generation can obtain different financial results because of differences in:
Operating hours
Daytime electricity consumption
Maximum-demand timing
Contracted demand
Power factor
Weekend and holiday loads
Seasonal operations
Time-of-Day energy consumption
Solar export and settlement arrangements
Equipment start-up patterns
A reliable financial model should combine solar-generation estimates with the facility’s load profile and tariff structure.
Time-of-Day Tariffs and Solar Savings
Telangana’s FY 2026–27 HT-II(A) schedule applies:
Additional energy charges during 6:00 a.m.–10:00 a.m.
Additional energy charges during 6:00 p.m.–10:00 p.m.
A daytime incentive from 10:00 a.m.–6:00 p.m.
Normal energy charges during 10:00 p.m.–6:00 a.m.
For HT-II(A), the order specifies an addition of ₹1.50 per kVAh during the morning and evening peak periods and an incentive of ₹0.50 per kVAh during daytime hours. TGERC Retail Supply Tariff Order FY 2026–27
Because rooftop solar generates mainly during the daytime, it may replace electricity that already receives a daytime tariff incentive. Its effect on expensive evening-peak consumption may be limited unless battery storage or operational load shifting is introduced.
The actual value of each solar unit must therefore be calculated using the customer’s applicable tariff, metering arrangement and settlement mechanism.
Solar, Battery Storage and Peak Shaving
A Battery Energy Storage System can store energy and discharge when grid demand approaches a selected limit. This strategy is commonly called peak shaving.
A properly configured battery-control system can:
- Monitor the facility’s grid demand.
- Compare demand with a defined target.
- Discharge stored energy during critical peaks.
- Reduce grid imports during those intervals.
- Recharge according to the approved solar and grid strategy.
Battery storage is not automatically economical. Feasibility depends on the demand-charge rate, frequency and duration of peaks, battery power and energy capacity, round-trip efficiency, degradation, replacement cost and control strategy. Learn more about COP Energy’s solar and battery solutions.
How to Improve Demand-Charge Savings
Analyse interval demand data
Monthly electricity bills show recorded maximum demand but may not reveal exactly when or why the peak occurred. Interval data helps identify:
Time of maximum demand
Duration of peak events
Recurring operational patterns
Solar–load overlap
Weekend demand
Seasonal changes
Suitable battery capacity
At least 12 months of bills should be reviewed, with interval-meter data used wherever available.
Right-size the solar system
A system sized only to maximise annual generation could export substantial daytime energy without materially reducing demand charges.
Commercial solar design should consider:
Daytime base load
Usable roof or land area
Maximum demand
Contracted demand
Working days
Seasonal production
Export limitations
Future expansion
Battery-storage plans
Stagger large equipment
Starting multiple chillers, pumps, compressors or production lines simultaneously can create a demand spike. Staggering their operation may reduce grid demand without affecting overall output.
Use automated demand control
An energy-management system can monitor grid demand and temporarily control flexible loads when the facility approaches a demand threshold.
Flexible loads may include:
Non-critical HVAC equipment
Water pumping
Thermal storage
EV charging
Compressors
Certain process loads
Load control must be designed so that safety, comfort and production are not compromised.
Improve power factor
Because HT demand is billed in kVA, low power factor can increase kVA demand for the same useful kW load.
The relationship is:
kVA = kW ÷ power factor
If a facility draws 400 kW at a power factor of 0.80:
400 kW ÷ 0.80 = 500 kVA
At a power factor of 0.95:
400 kW ÷ 0.95 ≈ 421 kVA
This simplified example shows why power-factor correction can be important. However, solar inverters and capacitor banks must be coordinated to avoid overcompensation or leading power factor.
Review contracted demand
If the business consistently operates below its contracted demand after installing solar or implementing efficiency measures, it may be worth evaluating whether contracted demand can be reduced through the applicable DISCOM process.
A reduction should not be requested without studying future loads. Setting contracted demand too low can create operational limitations or charges if demand later exceeds the approved level.
Commercial Solar Savings Calculation
A complete financial model should evaluate:
Total bill savings = Energy-charge savings + Demand-charge savings
+ Other eligible savings - New project costsNew or continuing costs may include operation and maintenance, insurance, financing, inverter replacement allowance, metering charges and battery degradation. The model should use conservative assumptions and test changes in generation, load growth, tariffs and equipment availability.
Commercial Solar Assessment Checklist
Before approving a project, collect:
- At least 12 months of electricity bills
- Contracted and recorded maximum demand
- Tariff category and supply voltage
- Available interval load data
- Operating schedule and major equipment list
- Power-factor history
- Planned expansion and future loads
- Roof or land details
- Transformer and panel capacities
- Export or net-metering arrangement
You can also review COP Energy’s project portfolio to understand its wider solar experience.
Frequently Asked Questions
1. Do solar panels automatically reduce demand charges?
No. Solar reduces demand charges only when it lowers the facility’s maximum grid demand used for billing. If the peak occurs after sunset or during low solar generation, demand charges may remain unchanged.
2. What is the difference between contracted and recorded demand?
Contracted demand is the electrical capacity agreed upon with the distribution company. Recorded demand is the maximum demand measured during a billing period. Billing demand is determined using both figures according to the applicable tariff.
3. How is billing demand calculated for an HT commercial consumer in Telangana?
For HT-II(A) under the FY 2026–27 tariff, billing demand is the maximum demand recorded during the month or 80% of contracted demand, whichever is higher. Consumers should verify their category and the latest tariff order.
4. What is the HT commercial demand-charge rate in Telangana?
The FY 2026–27 HT-II(A) schedule specifies ₹500 per kVA per month of billing demand. Tariffs can be revised, so the current TGERC order and electricity bill should be checked before making an investment decision.
5. Can solar reduce the contracted demand?
Solar can reduce grid demand, but it does not automatically change the contracted demand registered with the DISCOM. Contracted-demand revision requires a separate evaluation and applicable approval process.
6. Why did our energy consumption decrease while maximum demand remained high?
The facility may have experienced a brief peak during early morning, evening, cloudy weather or simultaneous operation of large equipment. One sufficiently high demand event can determine the month’s recorded maximum.
7. Can battery storage reduce demand charges?
Potentially, yes. A properly sized and controlled battery can discharge during peak-demand periods. Its financial viability depends on the load profile, demand-charge rate, battery cost and frequency of peak events.
8. Does power factor affect commercial demand charges?
Yes, where demand is measured in kVA. Poor power factor can result in higher kVA demand for the same amount of useful kW load.
9. How much electricity-bill reduction can commercial solar provide?
There is no universal percentage. Savings depend on solar capacity, generation, daytime consumption, tariff category, maximum-demand behaviour, contracted demand, power factor and export settlement.
10. How much billing history is needed for a solar feasibility study?
A minimum of 12 months is recommended to identify seasonal consumption and demand patterns. Interval meter data provides a more accurate assessment of solar–load overlap and peak demand.
Conclusion
Commercial rooftop solar can reduce electricity costs for Telangana businesses, but energy savings and demand-charge savings must be calculated separately.
Solar generally reduces grid-energy purchases when a facility consumes power during daylight hours. It reduces demand charges only when solar output coincides with the facility’s highest grid-demand period. For HT-II(A) consumers, the minimum billing-demand condition tied to contracted demand can further limit the reduction.
The best commercial solar strategy therefore combines:
Accurate load-profile analysis
Proper solar-system sizing
Maximum-demand monitoring
Power-factor management
Operational load shifting
Contracted-demand review
Battery storage where financially justified
Before investing, businesses should obtain a site-specific energy assessment based on current electricity bills, interval data and the latest Telangana tariff regulations.
COP Energy can evaluate your commercial load profile, solar-generation potential and demand behaviour to develop a solution focused on measurable, realistic long-term savings. Contact COP Energy to request a commercial energy assessment.
Regulatory note: Tariff rates and billing conditions can change. The figures in this article are based on TGERC’s FY 2026–27 Retail Supply Tariff Order and should be verified against the customer’s latest electricity bill and applicable DISCOM rules before making a financial decision.
Official Regulatory Source
Tariffs and billing conditions should always be checked against the latest TGERC tariff orders.
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