500+
Satisfied customers
CUSTOMER EXPERIENCES
What our customers say
We’re proud of our customers and the trust they place in us. Here are a few reviews and testimonials we’ve received. Every project matters to us, and we do everything we can to ensure the customer is satisfied.
IN NUMBERS
Our achievements
Over the years, we’ve installed hundreds of solar systems and helped customers save thousands of euros on energy costs.
5 MW+
Installed capacity
4.9/5
Average rating
98%
Would recommend
REVIEWS
Customer stories
Read what our customers say about their experience with Otso. Every piece of feedback matters and helps us improve.
"Outstanding service from start to finish! The team was professional, the installation was fast and high-quality. The solar park has been running for 6 months and we’re very happy. Our electricity bills have dropped by over 70%!"
Marten K.
Tallinn • 8 kW solar park
"I chose Otso because they were transparent and honest throughout the process. The quote was competitive and they kept to the deadlines. The heat pump works отлично and the house is always at the ideal temperature."
Kadri L.
Tartu • Air-to-air heat pump
"Our company installed a 150 kW solar system and we’re very satisfied. The investment will start paying for itself by the end of the second year. The Otso team were true experts and helped with everything from design to grid connection."
Toomas V.
Pärnu • 150 kW industrial system
"The solar + battery combination is the best investment we’ve made. In winter we charge the battery with cheap off-peak electricity, in summer with the sun. Our electricity bill is almost zero! Thanks to the Otso team for the excellent work."
Riina M.
Rakvere • 12 kW + 15 kWh battery
"The EV charger installation was quick and effortless. The team came over, installed everything needed, and configured the system to work with the solar park. Now I charge the car for free with solar energy. I recommend it to everyone!"
Jaanus P.
Viljandi • 22 kW EV charger
"The frequency market service with a battery is brilliant — the battery pays for itself much faster than we calculated! The system runs automatically and we earn extra income every month. The Otso team explained everything clearly and set it all up."
Andres S.
Haapsalu • 20 kWh battery + FCR-D
"Otso was the only one who could offer a complete solution — solar, battery, heat pump, and EV charger. Everything works in sync and our energy costs are minimal. A professional approach and top-quality work!"
Liis T.
Rapla • Turnkey solution
"We’re very satisfied! The consultation was thorough, the installation was fast and high-quality. The team was friendly and professional. The solar park has been running for a year with zero issues. Highly recommended!"
Kristjan H.
Jõhvi • 10 kW solar park
"Perfect service! Everything happened exactly as promised — timing, price, and quality. After installation, the team came back for training and explained everything in detail. We’re truly energy independent now!"
Eva K.
Kuressaare • 15 kW + 20 kWh
WHY CHOOSE US
Why customers trust us
Customer satisfaction isn’t an accident. It’s the result of a thoughtful approach and true dedication.
Commitment to quality
We use only top-tier components and follow all standards. Every project goes through thorough quality control.
Transparent communication
We keep you updated at every step. No hidden costs, no surprises — everything is clear and fair.
Long-term support
Our relationship doesn’t end with installation. We provide year-round support, maintenance, and guidance.
On-time delivery
We plan carefully and keep our promises. Your time matters, and we respect it.
Experienced team
Our team consists of certified professionals with years of hands-on experience.
Fair pricing
Our pricing is fair and competitive. You get top quality for a clear, honest price.
Join our family of satisfied customers
Get in touch and start your journey toward energy independence. We offer a free consultation and a clear quote.