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In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h).

Very cold winters increase demand for natural gas and to a lesser extent, electricity, while warmer than normal summers increase demand for electricity, especially among our residential and commercial customers., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for electricity and natural gas is often greater in the summer and winter months associated with cooling and heating., Such technologies could also result in further declines in commodity prices or demand for delivered energy., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions.

SOUTH DAKOTA ELECTRIC RATE SCHEDULE | NORTHWESTERN ENERGY PUBLIC SERVICE CORPORATION d/b/a NORTHWESTERN ENERGY | 326th Revised Sheet No. 33a | ADJUSTMENT CLAUSE RATES Per KWH

Funding for irrigation projects is provided through NorthWestern’s Universal System Benefits Charge (USBC)., Estimate electric energy and demand savings and/or natural gas savings for each measure., Electric demand reduction will be detailed by month as well. 8., NorthWestern is not responsible for project design, operation, or performance; however, NorthWestern will review the project design to verify estimates of costs, energy savings, and demand savings., The study proposal will include preliminary estimates of annual energy and electric demand savings and/or natural gas savings potential associated with the defined scope of work. 5.

Funding for irrigation projects is provided through NorthWestern’s Universal System Benefits Charge (USBC)., Estimate electric energy and demand savings and/or natural gas savings for each measure., Electric demand reduction will be detailed by month as well. 8., NorthWestern is not responsible for project design, operation, or performance; however, NorthWestern will review the project design to verify estimates of costs, energy savings, and demand savings., The study proposal will include preliminary estimates of annual energy and electric demand savings and/or natural gas savings potential associated with the defined scope of work. 5.

Information for our seasonal irrigation service customers about energy consumption and tips to minimize consumption.

The net of these two activities is charged (or credited) to NorthWestern., In general, the battery is connected to the VER resource that is used to charge the battery., • Demand response resources under automated control., Demand Side Management – The potential for reduction of consumer demand for energy through various methods such as fnancial incentives and behavioral change., Peak Demand – The highest hourly net energy consumption for load.

In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h).

Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for electricity and natural gas is often greater in the summer and winter months associated with cooling and heating., A decrease in the region’s electric capacity may impair the reliability of the grid, particularly during peak demand periods., Such technologies could also result in further declines in commodity prices or demand for delivered energy., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions.

All transmission costs are classified as demand-related costs., NorthWestern’s firm power supply contracts have demand charges that are not recoverable 15 in its Fuel Clause., Note that the system peak demand occurred in 10 the month of July., Generation costs and non-recoverable purchased power demand charges are functionalized 4 as production-related and allocated on the basis of the 12CP demand allocation factor., Lines 22 – 35 show the unit $/kW 10 charges that would result by using different units of customer demand (12 CP, NCP, billing 11 demand).

Environmental Protection Agency (EPA) - A Federal agency charged with protecting the environment., The demand for natural gas largely depends upon weather conditions., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions., This charge is recorded within other income, net on the Consolidated Statements of Income.

Larger users with loads greater than 15 kilowatts (kW) require a demand meter and incur an additional demand charge., The demand charge is measured through a demand meter which registers the highest rate of electrical fow (current) for specifed time periods, usually 15 or 30 minute intervalsduring each billing period, independent of the kWh energy usage., Making decisions to use your pump based on the meter-reading schedule provided can help you better control your demand charges., Demand charges may be prorated, if used less than 25 days, on the frst and last billing periods., Prorating allows you to pay a partial demand charge that better matches the time of energy use.

Monthly NCP demand is the maximum metered hourly (60-minute integration) demand in a month., Footnote any demand not stated on a megawatt basis and explain. 7.Report in column (g) the megawatt hours shown on bills rendered to the purchaser. 8.Report demand charges in column (h), energy charges in column (i), and the total of any other types of charges, including out-of-period adjustments, in column (j)., Do not report net exchange. 7.Report demand charges in column (k), energy charges in column (l), and the total of any other types of charges, including out-of-period adjustments, in column (m)., In column (k), provide revenues from demand charges related to the billing demand reported in column (h)., In column (e) report the demand charges and in column (f) energy charges related to the amount of energy transferred.

NATURAL GAS RATE SCHEDULE | Purchased Gas Cost Adjustment | Section No. 3 | Sheet No. 7.1

I became the Vice President in charge of Customer 11 Care in 2002 and assumed responsibility for Corporate Communications and 12 Human Resources in 2005 and 2009, respectively., While we did not want to be an early adopter of AMI, 20 we believed an AMI deployment was a matter of when, not if, given the 21 advancements in renewable energy, energy efficiency, distributed generation, 22 demand side management, and a move towards increased electrification in 23 BLS-10 general., NorthWestern when making the 15 decision to implement AMI fall into the following categories: 16 • Increased awareness and control by providing customers with detailed 17 usage data in real or near-real time including proactive billing and usage 18 alerts – which allows customers to better understand and manage their 19 consumption, to make more informed decisions about their energy usage, 20 and to identify ways they may be able to lower their bills; 21 BLS-11 • Proactive outage detection which allows the utility to more quickly 1 respond, improve restoration times, and provide alerts to customers 2 containing information about their outage; 3 • Reduction in the need to estimate meter reads which improves billing 4 accuracy and reduces customer confusion and frustration; 5 • Alternative rate and payment options such as time-of-use rates and pre- 6 pay options to give customers more flexibility in how they are billed and 7 how and when they pay; 8 • Energy conservation and demand, response support which allows 9 customers to use energy more wisely and to participate in demand 10 reduction programs to help offset the need to purchase energy on the 11 market during high demand times; 12 • Remote electric connect and disconnect which allows the utility to turn a 13 customer on or off in a matter of minutes on a 24 by 7 basis; and 14 • Automatic demand reset for commercial meters. 15 16 Additionally, NorthWestern has identified the following customer benefits 17 during implementation of AMI: 18 • Events and alarms to aid in detecting potential issues including on the 19 customer side such as faulty wiring or overloading; 20 • Aid in detecting issues with customer equipment such as pumps and 21 private solar installations that are not working properly or at all; 22 BLS-12 • The ability to send a signal to a meter to ensure power is flowing to the 1 meter, which helps customers determine if the issue is on their side of the 2 meter; and 3 • The ability

NorthWestern Energy 2021 fourth quarter FERC form

SOUTH DAKOTA GAS RATE SCHEDULE | Rate No. 81 - Residential Gas Service Gas Commodity Charge | Rate No. 82 - General Gas Service Gas Commodity Charge

This increase was primarily due to higher Montana transmission loads and rates, favorable weather compared to prior period, higher commercial demand as compared to the prior period due to the COVID-19 pandemic related shutdowns, the prior period disallowance of supply costs, and a favorable electric qualifying facilities (QF) liability adjustment as compared with the prior period., As a result of the project discontinuance, we recorded a $1.6 million pre-tax charge for the write-off of preliminary construction costs., This increase was primarily due to higher Montana transmission loads and rates, favorable weather, higher commercial demand as compared to the prior NorthWestern Reports 2021 Financial Results February 10, 2022 Page 6 period due to the COVID-19 pandemic related shutdowns, the prior period disallowance of supply costs, a favorable electric QF liability adjustment as compared with the prior period, and lower property and other taxes, partly offset by higher operating and maintenance expense, depreciation and depletion, and Montana electric supply costs., Consolidated utility margin for items impacting net income increased $55.9 million, including: • $25.1 million increase due to higher transmission rates and demand due to market conditions and pricing and the recognition of approximately $4.7 million of deferred interim revenues; • $17.1 million increase due to higher electric retail volumes driven by warmer summer weather in both Montana and South Dakota, customer growth, and increased commercial volume as compared to the prior year due to the COVID-19 pandemic related shutdowns, partly offset by warmer overall winter weather in Montana and South Dakota; • $9.4 million increase due to prior period MSPC disallowance of electric supply costs; • $4.4 million increase due to a more favorable electric QF liability adjustment compared to the prior period., This increase was primarily driven by higher Montana transmission loads and rates, favorable weather, higher commercial demand as compared to the prior period due to the COVID-19 pandemic related shutdowns, the prior period disallowance of supply costs, a favorable electric QF liability adjustment as compared with the prior period, and lower property and other taxes, partly offset by higher operation and maintenance expense, higher depreciation expense, and higher administrative and general expense.

Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for electricity and natural gas is often greater in the summer and winter months associated with cooling and heating., We are also impacted by market conditions outside of our service territories related to demand for transmission capacity and wholesale electric pricing., Such technologies could also result in further declines in commodity prices or demand for delivered energy., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions.

Environmental Protection Agency (EPA) - A Federal agency charged with protecting the environment., The demand for natural gas largely depends upon weather conditions., Thus, the rates we are allowed to charge may or may not match our costs at any given time., Demand for our Montana transmission capacity fluctuates with regional demand, fuel prices and weather related conditions., This charge is recorded within other income, net on the Consolidated Statements of Income.