Polarium

Senior Accountant

Join Polarium in Stockholm as a Senior Accountant, managing accounting, month-end closing, and financial reporting. Work in a dynamic renewable energy company with wellness benefits and a collaborative team.
Polarium
Polarium
Stockholm, Sweden On-site Full time UTC+01:00

Polarium

Company Overview

Name

Polarium

Headquarters

Stockholm, Sweden

Founded

2015

Size

Approximately 400 employees globally ranged from 330-600 in recent years (source: linkedin.com, apollo.io). Revenue of about SEK 1.084 billion in 2021 with rapid growth through the early 2020s (source: mfn.se).

What They Do

Polarium specializes in lithium-ion battery energy storage solutions, focusing on telecom, commercial, industrial, and distributed energy-storage applications (source: linkedin.com, polarium.com). Their product portfolio includes batteries, battery energy storage systems (BESS), and energy optimization software, with advanced cloud-based optimization and virtual power plant (VPP) functionalities integrated through recent partnerships (source: mfn.se, polarium.com). For telecom clients, Polarium provides reliable reserve-power solutions for base stations, while commercial and industrial customers benefit from energy cost reduction, grid upgrade avoidance, and revenue generation through energy arbitrage and flexibility services (source: polarium.com, mfn.se). Their competitive advantage lies in combining battery development expertise, modular BESS design, and integrated control software, enabling partnerships in EV charging, distributed storage, and telecom power sectors (source: polarium.com, polarium.com).

Projects & Track Record

Polarium has established a strong commercial track record, particularly in telecom energy storage deployments. A notable partnership with ATC Africa involved supplying thousands of energy-storage solutions and setting up a factory in Cape Town with an annual capacity exceeding 300,000 batteries (source: mfn.se). In the commercial and industrial sector, Polarium completed a 700 kWh installation for Lindberg & Son and deployed an Energy Optimization System in 2024 for Grönlunds Plåt (source: polarium.com, polarium.com). They also collaborated with Telia on a 2022 pilot project validating smart battery solutions for telecom networks and with Areim on a large-scale battery pilot in Swedish commercial property (source: mfn.se). Additionally, Polarium partnered with Kempower to integrate their BESS technology with EV charging infrastructure, enhancing reliable power distribution (source: polarium.com).

Recent Developments

In recent years, Polarium has intensified its focus on distributed storage and EV charging infrastructure. In January 2025, it formed a strategic partnership with Stella Futura to accelerate BESS deployment in Northern Europe, combining modular battery systems with cloud-based optimization and virtual power plant solutions (source: polarium.com). In March 2026, Polarium partnered with VAROPreem to deliver intelligent storage systems for fast-charging sites across Sweden, utilizing modular BESS and energy management system (EMS) functionality to address grid connection limitations (source: polarium.com). The company also appointed Jan Roschek as Managing Director for Germany in 2026, signaling expansion in that market (source: polarium.com). Furthermore, Polarium secured an RWE tolling arrangement to market at least 50 MW and 135 MWh from its distributed battery portfolio starting in late 2026 (source: polarium.com).

Working There

Polarium offers career opportunities across a range of disciplines including battery engineering, energy storage systems design, battery management, software and energy management systems (EMS), sales, project delivery, and regional business leadership (source: polarium.com, polarium.com). The company’s main office is located in Stockholm, Sweden, with an additional U.S. office in Littleton, Colorado, supporting its global operations and regional commercial expansion (source: linkedin.com, polarium.com). Polarium’s workplace culture emphasizes expertise in intelligent energy storage, combining hardware and software innovation with customer project execution, focusing on telecom power and distributed storage markets (source: polarium.com).


Last updated on Sep 4, 2026 | Report an issue

Job Description

We're on a journey to change the way the world uses energy and accelerate the transition to renewable energy through our market-leading energy storage systems.

As part of our Finance team, you will play an important role in ensuring accurate accounting, financial reporting and compliance within Polarium Energy Solutions AB. In this role, you will work hands-on with accounting, month-end closing, statutory reporting and related finance processes, while contributing to the continuous development of financial processes and systems.

You will collaborate closely with colleagues across Finance and other business functions, supporting the delivery of high-quality financial information and ensuring compliance with group policies and local regulations.

Responsibilities

In the role as Senior Accountant, you will be responsible for the accounting operations of Polarium Energy Solutions AB and support accounting-related activities across selected entities within the Polarium Group when needed. You will work closely with colleagues across the Finance function to ensure accurate accounting, timely reporting and compliance with group policies and local regulations.

The role includes day-to-day accounting, month-end closing activities, reconciliations, financial reporting and support with statutory reporting requirements. You will also contribute to continuous improvements of financial processes and systems.

This role is a central function within our Finance team at HQ in Stockholm, located in Hagastaden.

The position reports to the VP Global Accounting.

Your Main Tasks

Day-to-Day Accounting Operations

Execute journal entries, perform account reconciliations and manage daily accounting transactions in accordance with group policies and local requirements. Support ongoing accounting activities within assigned legal entities and contribute to accurate and timely financial information.

Month-End Closing

Lead the month-end and year-end closing processes, ensuring that activities are completed accurately and on time. Drive the closing timetable, coordinate inputs from relevant stakeholders, prepare accruals, provisions and other closing entries, and follow up to make sure the close is completed according to plan.

Perform balance sheet reconciliations using Adra Balancer and Task Manager and support internal and external reporting requirements.

Financial Reporting

Support the preparation of financial statements and reporting packages, assist with balance sheet and profit and loss analysis, and provide supporting documentation for audits and reviews.

Compliance & Statutory Reporting

Support compliance with local accounting regulations, tax requirements and group accounting policies. Assist with VAT reporting and other recurring statutory reporting requirements and support the preparation of annual reports and other regulatory filings.

Polarium Energy Solutions Public System Support

Manage transactional activities in the ERP system (Microsoft Business Central), identify opportunities for process efficiency, and support system optimization efforts.

Collaboration & Communication

Work closely with colleagues within Finance and other business functions to ensure efficient collaboration and information sharing. Support accounting-related matters across the Group when needed and collaborate with auditors, advisors and external partners.

Accounts Payable Support

Provide support to the Accounts Payable function during periods of high workload, absences or other business needs, helping to ensure efficient processing and timely payments.

Payroll Accounting Support

Support payroll-related accounting entries and reconciliations as part of the regular reporting cycle, in coordination with HR and external payroll providers.

Who Are You

To succeed in the role of Senior Accountant at Polarium, you are detail-oriented, analytical and well organized, with a strong interest in accounting and financial reporting.

You have a proactive mindset and enjoy working in a dynamic environment where priorities may change.

You are a strong team player who enjoys collaborating with colleagues and building relationships across functions.

You communicate clearly and professionally, both verbally and in writing.

You have a degree in Accounting, Finance or a related field and several years of experience in accounting and financial reporting.

You have experience working with month-end closing, reconciliations and accounting processes.

Experience from an international environment is considered an advantage, as is experience from a manufacturing company.

You are fluent in both Swedish and English, written and spoken.

Experience with Microsoft Business Central is highly valued. Experience with Adra Balancer and Task Manager is considered an advantage.

We Offer

  • Competitive salary
  • Wellness contribution
  • Opportunity to work in a dynamic, international company focused on renewable energy
  • Collaborative team environment with continuous learning opportunities

Questions?

If you have any questions regarding the position, please contact: Therese Lundh [email protected] VP Global Accounting

At Polarium, creating change in the energy industry starts with our people. We believe a diverse workplace drives creativity, innovation and better represents the customers and communities we serve around the world.

A healthy work-life balance supports both individual growth and long-term success.

Since Polarium launched in 2015, we've been on a mission to redesign the energy industry. We're unlocking the massive potential of energy storage systems through our wide range of intelligent and digital services. Our passion for solving challenges is what drives our next generation of premium energy storage products in use on all continents and in all climate zones. Today, we power businesses, optimize energy usage and reduce carbon dioxide emissions to create a cleaner future in energy.

We look forward to receiving your application!

What's in it for you?

We offer a challenging position in an open, friendly, international environment where we help each other to develop and create value, as We Are One. Your work and mind-set will have a true impact on Polarium's future success, and we encourage you to Take Charge.

Every day we encourage you to excel, as We think big for a smarter and more sustainable future - let's do it together!

Energize your career We believe an inclusive work environment is what will boost our employees' success. An open mindset is what charges our innovation and creativity. We believe that there's always one more thing to learn, one new thing to invent, and one more product to develop to make energy systems around the world greener and more efficient. Come join our team and get the opportunity to engineer the future!

Plug into Polarium

We've enabled endless energy since 2015.

Our frontier tech in energy storage systems has reached all over the world and transformed the renewable energy industry. Our valuable diversity, creativity and top-class engineering is the code we use to unlock the most complex sustainability problems in energy.

Apply now

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About the role

September 10, 2026

September 11, 2026

Full time

On-site

Company

Energy Storage

Polarium

polarium.com

  •  Stockholm, Sweden

Several years of experience in accounting and financial reporting

UTC+01:00