Independent Swiss energy services firm. Quantitative trading and renewable balancing across European short-term power markets — 15 years of operating experience, powered by the proprietary ZOHAR ML platform
Renewable Balancing & Structured Energy Trading
Renewable Balancing &
Structured Energy Trading
Renewable Balancing & Structured Energy Trading
ML Signals / Day
Market Coverage
GW Assets Managed
Market Coverage
Navigating increasing volatility in European power markets.
Navigating increasing volatility in European power markets.
Years in power markets.
Years
experience.
The structural shift in European power markets is no longer theoretical. In 2025, negative-price hours reached 6% across Germany and the Netherlands — double the share two years earlier — and German renewable curtailment exceeded 1.7 TWh. Day-ahead intervals tightened to 15 minutes in September 2025. The implication is operational: forecasting must resolve to the quarter-hour, execution must be automated, and risk management must absorb sustained negative prices without distorting upside positioning. TSOHAR is built for this market structure, not the one before it.
The structural shift in European power markets is no longer theoretical. In 2025, negative-price hours reached 6% across Germany and the Netherlands — double the share two years earlier — and German renewable curtailment exceeded 1.7 TWh. Day-ahead intervals tightened to 15 minutes in September 2025. The implication is operational: forecasting must resolve to the quarter-hour, execution must be automated, and risk management must absorb sustained negative prices without distorting upside positioning. TSOHAR is built for this market structure, not the one before it.
Operating across Germany and the Netherlands — Europe's two most renewable-intense short-term power markets, where forecasting accuracy and execution discipline determine the margin.
Our core capabilities.
Our core capabilities.
Our core capabilities.
01
Short-Term Market Trading
Proprietary trading on EPEX SPOT across Germany and the Netherlands. Own capital, own risk, own algorithms. We carry full market exposure on every position.
· 96 + ML-driven price signals per day — one per quarter-hour interval
· Real-time position monitoring with hard-coded drawdown and exposure limits
· A live stress test for the algorithms that also drive our balancing operations
02
Renewable Balancing
We take over the imbalance risk on wind and solar portfolios across Germany. Asset owners get a single management fee. We absorb the deviation costs
· Generation forecasts combining numerical weather predictions, asset-level historical performance, and grid conditions
· Continuous intraday rebalancing as market conditions and generation output shift
· End-to-end operational handling: nomination, scheduling, settlement, reconciliation
01
Short-Term Market Trading
Proprietary trading on EPEX SPOT across Germany and the Netherlands. Own capital, own risk, own algorithms. We carry full market exposure on every position.
· 96 + ML-driven price signals per day — one per quarter-hour interval
· Real-time position monitoring with hard-coded drawdown and exposure limits
· A live stress test for the algorithms that also drive our balancing operations
02
Renewable Balancing
We take over the imbalance risk on wind and solar portfolios across Germany. Asset owners get a single management fee. We absorb the deviation costs
· Generation forecasts combining numerical weather predictions, asset-level historical performance, and grid conditions
· Continuous intraday rebalancing as market conditions and generation output shift
· End-to-end operational handling: nomination, scheduling, settlement, reconciliation
01
Short-Term Market Trading
Proprietary trading on EPEX SPOT across Germany and the Netherlands. Own capital, own risk, own algorithms. We carry full market exposure on every position.
· 96 + ML-driven price signals per day — one per quarter-hour interval
· Real-time position monitoring with hard-coded drawdown and exposure limits
· A live stress test for the algorithms that also drive our balancing operations
02
Renewable Balancing
We take over the imbalance risk on wind and solar portfolios across Germany. Asset owners get a single management fee. We absorb the deviation costs
· Generation forecasts combining numerical weather predictions, asset-level historical performance, and grid conditions
· Continuous intraday rebalancing as market conditions and generation output shift
· End-to-end operational handling: nomination, scheduling, settlement, reconciliation
What this means for asset owners.
What this means for asset owners.
Wind and solar portfolios now face single-digit-percent revenue exposure to imbalance risk in volatile periods and 2025 was the most volatile year on record across Germany and the Netherlands. Asset owners who handle balancing internally carry the cost of building and operating that infrastructure. Those who outsource to incumbents pay premium fees built around legacy overhead. We offer a third option: ML-driven balancing on an automation-first cost base.
Led by an energy trading professional with 15 years of European power market experience.
Led by an energy trading professional with 15 years of European power market experience.
Led by an energy trading professional with 15 years of European power market experience.
Grigorii Toulskii - Founder & Managing Director
Grigorii Toulskii - Founder & Managing Director
Grigorii Toulskii - Founder & Managing Director
Grigorii Toulskii has spent 15 years in European power markets as a trader, operator, and founder. He has founded and scaled two renewable energy trading ventures — the first grew to manage 6 GW of renewable assets and was acquired by a major Swiss utility, the second was a fully automated trading house focused on European spot markets. His expertise spans short-term power trading, regulatory compliance with German and Dutch authorities, and end-to-end engineering of trading infrastructure in .NET, Python, and SQL. The technical foundation of ZOHAR is built on the same disciplines.
Grigorii Toulskii has spent 15 years in European power markets as a trader, operator, and founder. He has founded and scaled two renewable energy trading ventures — the first grew to manage 6 GW of renewable assets and was acquired by a major Swiss utility, the second was a fully automated trading house focused on European spot markets. His expertise spans short-term power trading, regulatory compliance with German and Dutch authorities, and end-to-end engineering of trading infrastructure in .NET, Python, and SQL. The technical foundation of ZOHAR is built on the same disciplines.
Lutry, CH
How we operate.
How we operate.
One platform. Two service lines.
Trading: 24/7 automation across EPEX SPOT DE and NL Balancing: wind and solar portfolios in Germany, management fee per MW
Trading: 24/7 automation across EPEX SPOT DE and NL
Balancing: management fee per MW, asset owner keeps the upside
Built for professional energy market participants.
Built for professional energy market participants.
TSOHAR works with utilities, independent power producers, and renewable asset managers across Germany and the Netherlands. Trading services are available in both markets; renewable balancing is currently focused on Germany. We are best suited to clients who need automated execution, ML-driven forecasting, and a fee structure built around technology, not headcount. Our automation-first cost base translates directly into fees materially below incumbent levels.
TSOHAR works with utilities, independent power producers, and renewable asset managers across Germany and the Netherlands. Trading services are available in both markets; renewable balancing is currently focused on Germany. We are best suited to clients who need automated execution, ML-driven forecasting, and a fee structure built around technology, not headcount. Our automation-first cost base translates directly into fees materially below incumbent levels.
Ready to work with TSOHAR?
For utilities, independent power producers, and institutional participants in European short-term power markets.
Ready to work with TSOHAR?
For utilities, independent power producers, and institutional participants in European short-term power markets.
Ready to work with TSOHAR?
For utilities, independent power producers, and institutional participants in European short-term power markets.