NYSE: CPK

◦Identification and pursuit of additional pipeline expansions, including new interstate and intrastate transmission projects.

◦Growth of Marlin Gas Services’ CNG transport business and expansion into LNG and RNG transport services as well as methane capture.

◦Identifying and undertaking additional strategic propane acquisitions that provide a larger foundation in current markets and expand our brand and presence into new strategic growth markets.

◦Leveraging our current capabilities, including our integrated set of energy delivery businesses, to support and contribute to a more sustainable future.

•Proactively managing our regulatory agenda.

◦Driving regulatory initiatives that align with our growth strategy and investment plans.

•Continually executing on our business transformation initiatives.

◦Increased opportunities to transform the Company with a focus on people, process, technology and organizational structure.

Operating Segments

We conduct operations within two reportable segments: Regulated Energy and Unregulated Energy. The remainder of our operations are presented as "Other businesses and eliminations" which were not material to our earnings or our financial position at December 31, 2025. These segments are described below in detail.

Regulated Energy

Overview

Our regulated energy businesses are comprised of natural gas and electric distribution, as well as natural gas transmission services.

On November 30, 2023, we completed the acquisition of FCG for $922.8 million in cash, including working capital adjustments as defined in the agreement, pursuant to the previously disclosed stock purchase agreement with Florida Power & Light Company. Upon completion of the acquisition, FCG became a wholly-owned subsidiary of the Company and is included within our Regulated Energy segment. FCG currently serves approximately 125,000 residential and commercial natural gas customers across eight counties in Florida, including Miami-Dade, Broward, Brevard, Palm Beach, Hendry, Martin, St. Lucie and Indian River. Results for FCG are included within our consolidated results from the acquisition date.

Chesapeake Utilities Corporation 2025 Form 10-K Page 3

The following table presents net income for the year ended December 31, 2025 and total assets as of December 31, 2025, by operation and area served:

Operations Areas Served Net Income Total Assets

(in millions)

Natural Gas Distribution

FPU Florida $ 33.2 $ 702.9

FCG Florida 5.2 1,133.7

Delmarva Natural Gas (1)
Delaware/Maryland 18.1 490.2

Natural Gas Transmission

Eastern Shore Delaware/Maryland/

Pennsylvania 28.0 599.3

Peninsula Pipeline Florida 25.6 275.7

Aspire Energy Express Ohio 0.6 8.6

Electric Distribution

FPU Florida 9.0 214.9

Total Regulated Energy $ 119.7 $ 3,425.3

(1) Delmarva Natural Gas consists of Delaware division and Maryland division. In accordance with the Maryland PSC approval of our natural gas base rate proceeding, effective April 2025, our natural gas distribution business in Maryland (Maryland natural gas division, Sandpiper Energy and Elkton Gas) are now consolidated for rate-making and other purposes and are reflected on a consolidated basis for all periods presented consistent with the final rate order. See Note 17, Rates and Other Regulatory Activities, for additional information.

Revenues in the Regulated Energy segment are based on rates regulated by the PSC in the states in which we operate or, in the case of Eastern Shore which is an interstate business, by the FERC. The rates are designed to generate revenues to recover all prudent operating and financing costs and provide a reasonable return for our stockholders. Each of our distribution and transmission operations has a rate base, which generally consists of the original cost of the operation's plant (less accumulated depreciation), working capital and other assets. For Delmarva Natural Gas and Eastern Shore, rate base also includes deferred income tax liabilities and other additions or deductions. The FPU natural gas, FCG, and FPU electric regulated energy operations do not include deferred income tax liabilities in their rate base.

Our natural gas and electric distribution operations bill customers at standard rates approved by their respective state PSC. Each state PSC allows us to negotiate rates, based on approved methodologies, for large customers that can switch to other fuels. Some of our customers in Maryland receive propane through underground distribution systems in Worcester County. We bill these customers under PSC-approved rates and include them in the natural gas distribution results and customer statistics.

Our natural gas and electric distribution operations earn profits on the delivery of natural gas or electricity to customers. The cost of natural gas or electricity that we deliver is passed through to customers under PSC-approved fuel cost recovery mechanisms. The mechanisms allow us to adjust our rates on an ongoing basis without filing a rate case to recover changes in the cost of the natural gas and electricity that we purchase for customers. Therefore, while our distribution operating revenues fluctuate with the cost of natural gas or electricity we purchase, our distribution adjusted gross margin is generally not impacted by fluctuations in the cost of natural gas or electricity.

Our natural gas transmission operations bill customers under rate schedules approved by the FERC or at rates negotiated with customers.

Chesapeake Utilities Corporation 2025 Form 10-K Page 4

Operational Highlights

The following table presents operating revenues, volumes and the average number of customers by customer class for our natural gas and electric distribution operations for the year ended December 31, 2025:

Delmarva

Natural Gas Distribution
Florida

Natural Gas Distribution FPU

Electric

Distribution

Operating Revenues (in millions)

Residential $ 101.6 61 % $ 112.3 31 % $ 49.9 48 %

Commercial and Industrial 54.2 32 % 194.1 54 % 44.5 43 %

Other (1)
11.9 7 % 55.8 15 % 9.5 9 %

Total Operating Revenues $ 167.7 100 % $ 362.2 100 % $ 103.9 100 %

Volumes (in Dts for natural gas/MW Hours for electric)

Residential 5,408,011 34 % 4,172,387 7 % 318,748 46 %

Commercial and Industrial 10,300,217 64 % 47,550,094 82 % 366,853 54 %

Other 293,693 2 % 6,346,023 11 % — — %

Total Volumes 16,001,921 100 % 58,068,504 100 % 685,601 100 %

Average Number of Customers (2)

Residential 105,737 93 % 211,478 92 % 26,026 78 %

Commercial and Industrial 8,482 7 % 17,340 8 % 7,490 22 %

Other 26 — % 131 — % — — %

Total Average Number of Customers 114,245 100 % 228,949 100 % 33,516 100 %

(1) Operating Revenues from "Other" sources include revenue, unbilled revenue, under (over) recoveries of fuel cost, conservation revenue, other miscellaneous charges, fees for billing services provided to third parties, and adjustments for pass-through taxes.

(2) Average number of customers is based on the twelve-month average for the year ended December 31, 2025.

The following table presents operating revenues, by customer type, for Eastern Shore and Peninsula Pipeline for the year ended December 31, 2025, as well as contracted firm transportation capacity by customer type, and design day capacity at December 31, 2025. Aspire Energy Express has been excluded from the table below and had operating revenue of $1.5 million and firm transportation capacity of 300,000 Dts/d for the year ended December 31, 2025:

Eastern Shore Peninsula Pipeline

Operating Revenues (in millions)

Local distribution companies - affiliated (1)
$ 38.4 44 % $ 50.0 95 %

Local distribution companies - non-affiliated 23.1 26 % — — %

Commercial and industrial - affiliated — — % 1.2 2 %

Commercial and industrial - non-affiliated 24.9 29 % 0.5 1 %

Other (2)
0.5 1 % 1.1 2 %

Total Operating Revenues $ 86.9 100 % $ 52.8 100 %

Contracted firm transportation capacity (in Dts/d)

Local distribution companies - affiliated 167,795 52 % 1,080,571 99 %

Local distribution companies - non-affiliated 56,576 18 % — — %

Commercial and industrial - affiliated — — % 1,500 <1%

Commercial and industrial - non-affiliated 96,040 30 % 5,100 1 %

Total Contracted firm transportation capacity 320,411 100 % 1,087,171 100 %

Design day capacity (in Dts/d)
320,411 100 % 1,087,171 100 %

Chesapeake Utilities Corporation 2025 Form 10-K Page 5

(1) Eastern Shore's and Peninsula Pipeline's service to our local distribution affiliates is based on the respective regulator's approved rates and is an integral component of the cost associated with providing natural gas supplies to the end users of those affiliates. We eliminate operating revenues of these entities against the natural gas costs of those affiliates in our consolidated financial information; however, our local distribution affiliates include this amount in their purchased fuel cost and recover it through fuel cost recovery mechanisms.

(2) Operating revenues from "Other" sources include the rental of gas properties.

Regulatory Overview

The following table highlights key regulatory information that was effective for each of our principal Regulated Energy operations at December 31, 2025. Peninsula Pipeline and Aspire Energy Express are not regulated with regard to cost of service by either the Florida PSC, the Ohio PUC or the FERC and are therefore excluded from the table. See Item 8, Financial Statements and Supplementary Data (Note 17, Rates and Other Regulatory Activities, in the consolidated financial statements) for further discussion on the impact of this legislation on our regulated businesses.

Natural Gas Distribution

Delmarva Florida Electric Distribution Natural Gas Transmission

Operation/Division Delaware Maryland FPU
FCG (1)
FPU Eastern Shore

Regulatory Agency Delaware PSC Maryland PSC Florida PSC FERC

Effective date - Last Rate Order
5/1/2025
4/19/2025
03/01/2023

06/09/2023
3/20/2025 08/01/2017

Rate Base (in Rates)

(in millions)
Not stated
Not stated $453.7 $487.3 Not stated
Not stated

Annual Rate Increase Approved (in millions) $6.1 $3.5 $17.2 $14.1 $8.6 $9.8

Capital Structure (in rates) (2)*

Not stated
Not stated LTD: 33%

STD: 5%

Equity: 45%

Other: 17% LTD: 31%

STD: 4%

Equity: 53%

Other: 12% LTD: Not stated

STD: Not stated

Equity: 50.04%
Not stated

Allowed ROE (3)

9.60%

6.88% (4)

10.25%

9.50%

10.20%

Not stated

TJCA Refund Status associated with customer rates Refunded Refunded Retained Refunded Refunded Refunded

(1) See additional information below regarding FCG's February 2026 notice to the Florida PSC of its intent to file a petition seeking a general rate base increase.

(2) Other components of capital structure include customer deposits, deferred income taxes and tax credits.

(3) Allowed after-tax ROE.

(4) Allowed rate of return as stated in final order.

* LTD-Long-term debt; STD-Short-term debt.

In January 2024, our natural gas distribution businesses in Maryland, CUC-Maryland Division, Sandpiper Energy, Inc., and Elkton Gas Company (collectively, “Maryland natural gas distribution businesses”) filed a joint application for a natural gas rate case with the Maryland PSC. In connection with the application, we sought approval of the following: (i) permanent rate relief of approximately $6.9 million with a ROE of 11.5 percent; (ii) authorization to make certain changes to tariffs to include a unified rate structure and to consolidate the Maryland natural gas distribution businesses which we anticipate will be called Chesapeake Utilities of Maryland, Inc.; and (iii) authorization to establish a rider for recovery of the costs associated with our new technology systems. A $2.6 million increase in annual base rates was approved, and the Company filed a Phase II filing in November 2024 to determine rate design across the Maryland natural gas distribution businesses, consolidation of the applicable tariffs and recovery of technology costs. The hearing was held in March 2025, during which Phase II was approved, including an additional $0.9 million in revenue requirement for a total cumulative increase of $3.5 million. A final order was issued in April 2025 and included approval of the consolidation of the operations and the assets of CUC-Maryland Division, Sandpiper Energy, and Elkton Gas into one entity, which was renamed and operates as Chesapeake Utilities of Maryland, Inc.

In January 2024, our Maryland natural gas distribution businesses also filed a joint petition for approval of their proposed unified depreciation rates with the Maryland PSC. A settlement agreement between the Company, PSC staff and the OPC was reached and the final order approving the settlement agreement went into effect in July 2024, with new depreciation rates effective as of January 1, 2023. The approved depreciation resulted in an annual reduction in depreciation expense of approximately $1.2 million.

Chesapeake Utilities Corporation 2025 Form 10-K Page 6

In August 2024, our Florida Electric division filed a petition with the Florida PSC seeking a general base rate increase of $12.6 million with a ROE of 11.3 percent based on a 2025 projected test year. Annualized interim rates of approximately $1.8 million, were approved and became effective in November 2024. In March 2025, the Florida PSC approved the permanent rate increase, but the order was subsequently protested. In May 2025, the Company reached a settlement agreement with the interested parties to resolve all outstanding issues. This settlement which was approved by the Florida PSC in July 2025, provides for a total revenue increase of approximately $8.6 million on an annual basis, with $1.0 million of the increase deferred from the first year's base rate increase and recovered over three years. A step-up rate increase was also approved for up to $0.7 million, upon completion of the purchase and refurbishment of certain substations, which is expected to be completed in December 2026.

In August 2024, our Delaware natural gas division filed an application for a natural gas rate case with the Delaware PSC seeking approval of the following: (i) permanent rate relief of approximately $12.1 million with ROE of 11.5 percent; (ii) proposed changes to depreciation rates which were part of a depreciation study also submitted with the filing; and (iii) authorization to make certain changes to tariffs. Annualized interim rates were approved by the Delaware PSC in the amount of $2.5 million and became effective in October 2024. A settlement among the Company, PSC staff and the Delaware Division of the Public Advocate was reached and approved by the Delaware PSC in June 2025 providing an annual revenue increase of $6.1 million, as well as dividing the rate case into two phases. Rates set to recover the approved components of the increase were effective in March 2025. In October 2025, a settlement was reached for Phase II of the rate case addressing tariff-related changes including rate design and approved by the Delaware Public Service Commission with rates effective as of October 15, 2025.

In May 2022, FCG filed a general base rate increase with the Florida PSC based on a projected 2023 test year. In June 2023, the Florida PSC issued an order approving a single total base revenue increase of $23.3 million (which included an incremental increase of $14.1 million, a previously approved increase of $3.8 million for a liquefied natural gas facility, and $5.3 million to transfer the SAFE investments from a rider clause to base rates), with new rates becoming effective as of May 1, 2023. The Commission also approved FCG's proposed RSAM with a $25.0 million reserve amount, continuation and expansion of the capital SAFE program, implementation of an automated metering infrastructure pilot, and continuation of the storm damage reserve with a target reserve of $0.8 million. The RSAM was recorded as either an increase or decrease to accrued removal costs on the balance sheet, with a corresponding increase or decrease to depreciation and amortization expense. At December 31, 2024, the RSAM reserve had been completely utilized. The Florida OPC filed a notice of appeal with the Florida Supreme Court in July 2023, which is pending. The Florida OPC filed their initial brief in January 2024 with answer briefs filed in April 2024. Oral arguments in the case were held in December 2024.

In February 2025, FCG filed a depreciation study with the Florida PSC. The application is requesting approval of revised annual depreciation rates, as well as a reduction related to a reserve imbalance that would be amortized over a two-year period. The outcome of the application was subject to review and approval by the Florida PSC. In February 2026, the Florida PSC approved a $6.8 million reserve imbalance to be amortized over the remaining life of the assets, with the revised depreciation rates effective as of January 1, 2025.

In February 2026, FCG provided notice to the Florida PSC of its intent to file a petition seeking a general rate base increase based on a 2027 projected test year. The rate case filing is expected to be submitted in April 2026 and the outcome of the application will be subject to review and approval by the Florida PSC.

The following table presents margin stability mechanisms that have been approved by the respective PSC for our regulated energy distribution businesses at December 31, 2025. These include: Delaware surcharges to expand natural gas service in its service territory as well as for the conversion of propane distribution systems to natural gas; Maryland’s surcharges to fund natural gas conversions and system improvements in Worcester County; Florida’s GUARD surcharge which provides accelerated recovery of the costs of replacing older portions of the natural gas distribution system to improve safety and reliability; FCG's SAFE surcharge which provides accelerated recovery of the costs of replacing older portions of that natural gas distribution system to improve safety and reliability; and the Florida electric distribution operation's limited proceeding which allowed recovery of storm-related costs and the Storm Protection Plan ("SPP") which provides recovery of storm hardening costs.

Chesapeake Utilities Corporation 2025 Form 10-K Page 7

Operation(s)/Division(s) Jurisdiction Infrastructure mechanism
Margin stability mechanism (1)

Delaware division Delaware Yes No

Maryland division (2)
Maryland No Yes

FPU natural gas Florida Yes No

FCG (3)
Florida Yes No

FPU electric division Florida Yes No

(1) Margin stability mechanisms reduce variability due to rate design, revenue normalization clauses, and other riders.

(2) In accordance with the Maryland PSC approval of our natural gas base rate proceeding, effective April 2025, our natural gas distribution business in Maryland (Maryland natural gas division, Sandpiper Energy and Elkton Gas) are now consolidated for rate-making and other purposes and are reflected on a consolidated basis for all periods presented consistent with the final rate order. See Note 17, Rates and Other Regulatory Activities, for additional information.

(3) See Item 8, Financial Statements and Supplementary Data, Note 17, Rates and Other Regulatory Activities, for additional information related to FCG's RSAM that was approved as part of its rate case effective as of May 1, 2023.

Weather

Weather variations directly influence the volume of natural gas and electricity sold and delivered to residential and commercial customers for heating and cooling and changes in volumes delivered impact the revenue generated from these customers. Natural gas volumes are highest during the winter months, when residential and commercial customers use more natural gas for heating. Demand for electricity is highest during the summer months, when more electricity is used for cooling. We measure the relative impact of weather using degree-days. A degree-day is the measure of the variation in the weather based on the extent to which the average daily temperature falls above or below 65 degrees Fahrenheit. Each degree of temperature below 65 degrees Fahrenheit is counted as one HDD, and each degree of temperature above 65 degrees Fahrenheit is counted as one CDD. Normal heating and cooling degree-days are based on the most recent 10-year average.

Competition

Natural Gas Distribution

While our natural gas distribution operations do not compete directly with other distributors of natural gas for residential and commercial customers in our service areas, we do compete with other natural gas suppliers and alternative fuel providers for sales to industrial customers. Large customers could bypass our natural gas distribution systems and connect directly to intrastate or interstate transmission pipelines, and we compete in all aspects of our natural gas business with alternative energy sources, including electricity, oil, propane and renewables. The most effective means to compete against alternative fuels are lower prices, superior reliability and flexibility of service. Natural gas historically has maintained a price advantage in the residential, commercial and industrial markets, and reliability of natural gas supply and service has been excellent. In addition, we provide flexible pricing to our large customers to minimize fuel switching and protect these volumes and their contributions to the profitability of our natural gas distribution operations.

Natural Gas Transmission

Our natural gas transmission business competes with other interstate and intrastate pipeline companies to provide service to large industrial, generation and distribution customers, primarily in the northern portion of the Delmarva Peninsula and in Florida. Our transmission business in Ohio, Aspire Energy Express, services one customer, Guernsey Power Station, to which it is the sole supplier.

Electric Distribution

While our electric distribution operations do not compete directly with other distributors of electricity for residential and commercial customers in our service areas, we do compete with other electricity suppliers and alternative fuel providers for sales to industrial customers. Some of our large industrial customers may be capable of generating their own electricity, and we structure rates, service offerings and flexibility to retain these customers in order to retain their business and contributions to the profitability of our electric distribution operations.

Chesapeake Utilities Corporation 2025 Form 10-K Page 8

Supplies, Transmission and Storage

Natural Gas Distribution

Our natural gas distribution operations purchase natural gas from marketers and producers and maintain contracts for transportation and storage with several interstate pipeline companies to meet projected customer demand requirements. We believe that our supply and capacity strategy will adequately meet our customers’ needs over the next several years and we will continue to adapt our supply strategy to meet projected growth in customer demand within our service territories.

The Delmarva Natural Gas distribution systems are directly connected to Eastern Shore’s pipeline, which has connections to other pipelines that provide us with transportation and storage. These operations can also use propane-air and liquefied natural gas peak-shaving equipment to serve customers. Our Delmarva Peninsula natural gas distribution operations maintain asset management agreements with a third party to manage their natural gas transportation and storage capacity. The current agreements were effective as of April 2023 and expire in March 2026. Our Delmarva operations receive a fee, which we share with our customers, from the asset manager, who optimizes the transportation, storage and natural gas supply for these operations.

Our FPU natural gas distribution business uses Peninsula Pipeline and Peoples Gas system (a subsidiary of Emera Incorporated) to transport natural gas where there is no direct connection with FGT. FPU natural gas distribution and Eight Flags entered into separate 10-year asset management agreements with Emera Energy Services, Inc. to manage their natural gas transportation capacity, each of which expires in November 2030. An agreement with Florida Southeast Connection LLC for additional service to Palm Beach County is also in place for an initial term through December 2044. FCG utilizes FGT and Peninsula Pipeline to transport natural gas.

A summary of our pipeline capacity contracts follows:

Maximum Daily Firm Transportation Capacity (Dts) Contract Expiration Dates

Division Pipeline

Delmarva Natural Gas Distribution Eastern Shore 167,795 2026-2044

Columbia Gas (1)
5,246 2029-2032

Transco (1)
30,439 2026-2032

TETLP (1)
50,000 2027

FPU natural gas
Gulfstream (2)
10,000 2032

FGT 48,716 - 82,317 2026-2041

Peninsula Pipeline 399,600 2033-2048

Peoples Gas system 12,160 2026

Florida Southeast Connection LLC 5,000 2044

Southern Natural Gas Company 1,500 2029

FCG FGT 32,235 - 68,955 2030

Peninsula Pipeline 15,000 2033 - 2043

(1) Transco, Columbia Gas and TETLP are interstate pipelines interconnected with Eastern Shore's pipeline.

(2) Pursuant to a capacity release program approved by the Florida PSC, all of the capacity under this agreement has been released to various third parties. Under the terms of these capacity release agreements, Chesapeake Utilities is contingently liable to Gulfstream should any party, that acquired the capacity through release, fail to pay the capacity charge.

Eastern Shore has three agreements with Transco for a total of 7,292 Dts/d of firm daily storage injection and withdrawal entitlements and total storage capacity of 288,003 Dts. These agreements expire in March 2028. Eastern Shore retains these firm storage services in order to provide swing transportation service and firm storage service to customers requesting such services.

Aspire Energy Express, our Ohio intrastate pipeline subsidiary, has an agreement to provide natural gas transportation capacity to Guernsey Power Station.

Chesapeake Utilities Corporation 2025 Form 10-K Page 9

Electric Distribution

Our Florida electric distribution operation purchases wholesale electricity under the power supply contracts summarized below:

Area Served by Contract Counterparty Contracted Amount (MW) Contract Expiration Date

Northwest Florida Florida Power & Light Company Full Requirement* 2032

Northeast Florida
Florida Power & Light Company
Full Requirement* 2032

Northeast Florida Eight Flags 21 2036

Northeast Florida Rayonier 1.7 to 3.0 2036

Northeast Florida WestRock Company As-available N/A

*The counter party is obligated to provide us with the electricity to meet our customers’ demand, which may vary.

Unregulated Energy

Overview

The following table presents net income for the year ended December 31, 2025 and total assets as of December 31, 2025, for our Unregulated Energy segment by operation and area served:

Operations Area Served Net Income (Loss) Total Assets

(in millions)

Propane Operations (Sharp, Diversified Energy, FPU and Flo-gas) Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina, Florida $ 12.7 $ 192.1

Energy Transmission (Aspire Energy) Ohio 5.0 150.5

Energy Generation (Eight Flags) Florida 1.7 30.0

Marlin Gas Services The Entire U.S. 5.1 66.6

Sustainable investments and other (1)
Various (3.2) 55.8

Total $ 21.3 $ 495.0

(1) Includes our renewable natural gas projects that are in various stages of development.

Propane Operations

Our propane operations sell propane to residential, commercial/industrial, wholesale and AutoGas customers, in the Mid-Atlantic region, North Carolina, South Carolina and Florida, through Sharp Energy, Inc., Sharpgas, Inc., Diversified Energy, FPU and Flo-gas. We deliver to and bill our propane customers based on two primary customer types: bulk delivery customers and metered customers. Bulk delivery customers receive deliveries into tanks at their location. We invoice and record revenues for these customers at the time of delivery. Metered customers are either part of an underground propane distribution system or have a meter installed on the tank at their location. We invoice and recognize revenue for these customers based on their consumption as dictated by scheduled meter reads. As a member of AutoGas Alliance, we install and support propane vehicle conversion systems for vehicle fleets and provide on-site fueling infrastructure.

Chesapeake Utilities Corporation 2025 Form 10-K Page 10

Propane Operations - Operational Highlights

For the year ended December 31, 2025, operating revenues, volumes sold and average number of customers by customer class for our propane operations were as follows:

Operating Revenues

(in millions) Volumes

(in thousands of gallons)
Average Number of Customers (1)

Residential bulk $ 54.9 32 % 17,538 22 % 67,604 73 %

Residential metered 17.2 10 % 5,220 7 % 15,320 17 %

Commercial bulk 44.0 26 % 23,549 30 % 9,095 10 %

Commercial metered 1.6 1 % 538 1 % 218 <1%

Wholesale 26.1 15 % 26,645 34 % 48 <1%

AutoGas 7.9 4 % 5,134 6 % 117 <1%

Other (2)
19.9 12 % — — % — — %

Total $ 171.6 100 % 78,624 100 % 92,402 100 %

(1) Average number of customers is based on a twelve-month average for the year ended December 31, 2025.

(2) Operating revenues from "Other" sources include revenues from customer loyalty programs; delivery, service and appliance fees; and unbilled revenues.

Competition

Our propane operations compete with national and local independent companies primarily on the basis of price and service. Propane is generally a lower cost fuel alternative for home heating compared to oil and electricity but more expensive than natural gas. Our propane operations are largely concentrated in areas that are not currently served by natural gas distribution systems.

Supplies, Transportation and Storage

We purchase propane from major oil companies and independent natural gas liquids producers. Propane is transported by truck and rail to our bulk storage facilities in Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina and Florida which have a total storage capacity of 8.4 million gallons. Deliveries are made from these facilities by truck to tanks located on customers’ premises or to central storage tanks that feed our underground propane distribution systems. While propane supply has traditionally been adequate, significant fluctuations in weather, closing of refineries and disruption in supply chains, could cause temporary reductions in available supplies.

Weather

Propane revenues are affected by seasonal variations in temperature and weather conditions, which directly influence the volume of propane used by our customers. Our propane revenues are typically highest during the winter months when propane is used for heating. Sustained warmer-than-normal temperatures will tend to reduce propane use, while sustained colder-than-normal temperatures will tend to increase consumption.

Unregulated Energy Transmission and Supply (Aspire Energy)

Aspire Energy owns approximately 2,800 miles of natural gas pipeline systems in 40 counties in Ohio. The majority of Aspire Energy’s revenues are derived from long-term supply agreements with Columbia Gas of Ohio and Consumers Gas Cooperative ("CGC"), which together serve more than 23,000 end-use customers. Aspire Energy purchases natural gas to serve these customers from conventional producers in the Marcellus and Utica natural gas production areas. In addition, Aspire Energy's Noble Road Landfill RNG pipeline transports RNG generated from the landfill to Aspire Energy’s pipeline system, displacing conventionally produced natural gas. In 2025, the RNG volumes represented approximately 10 percent of Aspire Energy’s gas gathering volumes and are anticipated to continue at such rate in 2025 and beyond. In addition, Aspire Energy earns revenue by gathering and processing natural gas for customers.

Chesapeake Utilities Corporation 2025 Form 10-K Page 11

For the year ended December 31, 2025, Aspire Energy's operating revenues and deliveries by customer type were as follows:

Operating revenues Deliveries

(in millions) % of Total (in thousands Dts) % of Total

Supply to Columbia Gas of Ohio $ 17.3 34 % 2,716 35 %

Supply to CGC 21.2 42 % 2,164 27 %

Supply to Marketers 9.6 19 % 2,890 37 %

Other (including natural gas gathering and processing) 2.3 5 % 54 1 %

Total $ 50.4 100 % 7,824 100 %

Energy Generation (Eight Flags)

Eight Flags generates electricity and steam at its CHP plant located on Amelia Island, Florida. The plant is powered by natural gas transported by Peninsula Pipeline and our FPU natural gas distribution business and produces approximately 21 MW of electricity and 75,000 pounds per hour of steam. Eight Flags sells the electricity generated from the plant to our Florida electric distribution operation and sells the steam to the customer who owns the site on which the plant is located, both under separate 20-year contracts.

Marlin Gas Services

Marlin Gas Services is a supplier of mobile CNG/RNG and virtual pipeline solutions, primarily to utilities, pipelines, and RNG producers. Marlin Gas Services provides temporary hold services, pipeline integrity services, emergency services for damaged pipelines and specialized gas services for customers who have unique requirements. These services are provided by a highly trained staff of drivers and maintenance technicians who are all certified to meet/exceed PHMSA standards to safely perform pipeline functions throughout the United States. Marlin Gas Services maintains a fleet of CNG trailers, mobile compression equipment, LNG tankers and vaporizers, and an internally developed patented regulator system which allows for delivery of over 7,000 Dts/d of natural gas. Marlin Gas Services continues to actively expand the territories it serves, as well as leveraging its fleet of equipment and patented technologies to serve LNG and RNG market needs.

Sustainable Investments

Our sustainable investments are comprised primarily of our renewable natural gas projects that are in various stages of development. Included in these are the assets and intellectual property of Planet Found that we acquired during the fourth quarter of 2022, whose farm scale anaerobic digestion pilot system and technology produces biogas from poultry litter. In addition, we constructed a dairy manure RNG facility that we own and operate at Full Circle Dairy in Madison County, Florida. The project consists of a facility converting dairy manure to RNG and transportation assets to bring the gas to market. The facility became operational with the first injection of RNG during the second quarter of 2024.

Environmental Matters

See Item 8, Financial Statements and Supplementary Data (Note 18, Environmental Commitments and Contingencies, in the consolidated financial statements).

Human Capital Initiatives

Our tradition of serving employees, customers, investors, partners and communities is at the core of our special culture. Our unique culture is grounded in a solid foundation of regulated businesses, but enhanced by an entrepreneurial, innovative and competitive market mindset. Among the ongoing initiatives across our enterprise, we highlight below the importance of our culture of safety, our team, and our commitment to supporting a more sustainable future.

Workplace Health and Safety

We are committed to ensuring safety is at the center of our culture and the way we do business. The importance of safety is exhibited throughout the entire organization, with the direction and tone set by both the BOD and our President and CEO, and evidenced through required attendance at monthly safety meetings, routine safety training and the inclusion of safety moments at key team meetings. Additionally, we remain committed to providing products and services to our customers in a safe and reliable manner.

Chesapeake Utilities Corporation 2025 Form 10-K Page 12

Maintaining safety as a priority requires shared responsibility. Our employees remain committed and work together to ensure that our plans, programs, policies, and behaviors are aligned with our aspirations as a Company. The achievement of superior safety performance is both an important short-term and long-term strategic initiative in managing our operations. To support this commitment, the Company has invested heavily in safety and simulation training programs.

Our state-of-the art training facilities known as Safety Towns, located in Dover, Delaware and DeBary Florida, now serve as resources for training our employees who build, maintain and operate our natural gas infrastructure. The facilities offer hands-on training and fully immersive, on-the-job field experiences. The Company conducts live simulations and has adopted the National Incident Management Systems ("NIMS") approach to emergency response. First responders and other community partners also benefit from the realistic scenario-based training based on conditions they could encounter as they enter homes in the community.

Our Team Drives Our Performance

Our employees are the key to our success. Our leadership and human resources teams are responsible for attracting and retaining top talent and as an equal opportunity employer committed to creating a diverse workforce, we consider all qualified applicants without regard to race, religion, color, sex, national origin, age, sexual orientation, gender identity, disability or veteran status, among other factors. Our senior management team includes a Chief Human Resources Officer, with expertise in diverse candidate recruitment, to ensure that we continue to expand our candidate pools to better reflect the diverse demographics of the communities we serve.

Throughout our organization, we seek to promote from within, reviewing strategic positions regularly and identifying potential internal candidates to fill those positions, evaluating critical job skill sets to identify competency gaps and creating developmental plans to facilitate employee professional growth, as well as succession plans for key positions throughout the organization. We provide training and development programs, including many forms of training on our internal learning platform, as well as tuition reimbursement to promote continued professional growth.

We had more than 1,300 employees at December 31, 2025, 186 of whom are union employees represented by two labor unions: the International Brotherhood of Electrical Workers ("IBEW") and the United Food and Commercial Workers Union. The collective bargaining agreements covering our employees with these labor unions expire in 2027 and 2028, respectively. We consider our relationships with employees, including those covered by collective bargaining agreements, to be in good standing. We provide a competitive Total Rewards package for our employees including health insurance coverage, wellness initiatives, retirement savings benefits, paid time off, employee assistance programs, educational and tuition reimbursement, competitive pay, career growth opportunities, paid volunteer time, and a culture of recognition.

We listen to our employees and actively seek their input and feedback. Many of the initiatives we have in place are driven by feedback from our employees during an annual survey process or through regular employee engagement. We have also been purposeful in wanting to provide adequate recognition of our employees and their many efforts. We maintain an internal recognition platform which enables employees to be recognized in real-time for their contributions.

We have a values-driven culture that supports diversity and inclusion across our enterprise including within our employee resource groups ("ERGs").

Our first ERG was established in 2019, and as of December 31, 2025, there were 12 active ERGs meeting throughout the Company. ERGs are voluntary, employee-led groups that focus on shared identities, affinities and experiences and seek to apply those perspectives to initiatives that create value throughout the Company. The ERGs support their members' personal growth and professional development, and help develop learning programs and community service opportunities throughout the Company. ERGs also help foster a sense of belonging by creating a deep and intentional community that extends beyond an employee’s day-to-day team and colleagues into a companywide network.

Driving Sustainability across the Company

Consistent with our culture of teamwork, the focus on sustainability is supported and shared across our organization by the dedication and efforts of our BOD and its Committees, as well as through the entrepreneurship and dedication of our team. As stewards of long-term enterprise value, the BOD is committed to overseeing the sustainability of the Company, its environmental stewardship initiatives, and its safety and operational compliance practices. Chesapeake Utilities continues to drive numerous initiatives in support of its sustainability focus, including but not limited to:

•Construction and operation of our first full scale RNG production facility in Lee, Florida utilizing dairy waste;

•Production of raw biogas, that is pipeline quality RNG, at our Planet Found poultry anaerobic digester facility in Worcester County, Maryland;

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•FERC approval and construction advancing for the Worcester Resiliency Upgrade project, an LNG storage facility project on Delmarva;

•Transportation of RNG produced from multiple third-party waste facilities and injected into multiple interconnection points across our various pipeline systems;

•Continued internal team engagement focused on identifying and recommending ways to further reduce methane emissions for our transmission and gathering operations;

•Implementation of various energy efficiency programs in several of our service territories;

•Alignment of FCG’s SAFE program to more closely align with FPU’s GUARD program; and

•Continued recycling of used pipe into benches, many of which have been donated to various organizations.

Information about our Executive Officers

Set forth below are the names, ages, and positions of our executive officers with their recent business experience. The age of each officer is as of the filing date of this Annual Report.

Name Age Executive Officer Since Offices Held During the Past Five Years

Jeffry M. Householder 68 2010 Chair of the Board of Directors (May 2023 - present) President (January 2019 - present) Chief Executive Officer (January 2019 - present) Director (January 2019 - present)

President of FPU (June 2010 - February 2019)

Beth W. Cooper 59 2005 Executive Vice President (February 2019 - present)

Chief Financial Officer (September 2008 - present)

Senior Vice President (September 2008 - February 2019)

Treasurer (January 2022 - present)

Assistant Corporate Secretary (March 2015 - present)

James F. Moriarty 68 2015 Executive Vice President (February 2019 - present) General Counsel & Corporate Secretary (March 2015 - present) Chief Policy and Risk Officer (February 2019 - present)

Senior Vice President (February 2017 - February 2019) Vice President (March 2015 - February 2017)

Kevin J. Webber 67 2010 Chief Development Officer (January 2022 - present)

Senior Vice President (February 2019 - present) President FPU (February 2019 - December 2019) Vice President Gas Operations and Business Development Florida Business Units (July 2010 - February 2019)

Jeffrey S. Sylvester 56 2019
Chief Operating Officer (January 2022 - present)

Senior Vice President (December 2019 - present) Vice President Black Hills Energy (October 2012 - December 2019)

Available Information on Corporate Governance Documents

Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other reports and amendments to these reports that we file with or furnish to the SEC at their website, www.sec.gov, are also available free of charge at our website, www.chpk.com, as soon as reasonably practicable after we electronically file these reports with, or furnish these reports to the SEC. The content of this website is not part of this Annual Report.

In addition, the following documents are available free of charge on our website, www.chpk.com:

•Business Code of Ethics and Conduct applicable to all employees, officers and directors;

•Code of Ethics for Financial Officers;

•Corporate Governance Guidelines; and

•Charters for the Audit Committee, Compensation Committee, Investment Committee, and Corporate Governance Committee of the BOD.

Any of these reports or documents may also be obtained by writing to: Shareholders Services; c/o Chesapeake Utilities Corporation, 500 Energy Lane Suite 100, Dover, DE 19901.

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