SIESTART™ hybrid solutions

Instant and zero carbon energy at the push of a button

Today's energy producers depend on the reliability of their operations and 100% availability of energy. They need to quickly respond to fluctuations in power demand and must be able to shift to island operation to ensure an independent power supply when needed. The challenge is to meet these standards while also reducing emissions and costs. Grid fluctuations are currently compensated primarily by fossil-fired power plants. They provide dispatchable and reliable power but depend on external sources when an autonomous power supply is needed. In this case, battery energy storage system (BESS) serves as ideal back-up for instant power supply. SIESTART sums up the capabilities of both fossil and renewable power generation by integration of BESS. Such hybrid solutions provide instantaneous, reliable, and sustainable energy.

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Stable grids are a necessity to providing safe, reliable energy. In today's rapidly changing energy landscape, factors such as the increase in renewable power generation, aging infrastructure, and the extension of power supply to remote areas challenge the ability to balance both real and reactive power.

Batteries are currently the first choice when balancing load difference in the grid is required, due to their flexible, reliable and instantenous operation behaviour. They're also supporting the decarbonization by integrating renewable power.

New opportunities

Boosting existing and new plants

SIESTART enables an advanced upgrade for existing power plants, enriching them with new features, while extending performance and providing new business opportunities – independently of OEM technology. It also significantly improves the value of newly built power generation units. With its exceptional flexibility, SIESTART can be used with gas turbines, steam turbines and combined cycles. This helps you to easily scale your power production operations and reduce operating expenses (OpEx). 

Typical implementation cases for SIESTART

The combination of a battery energy storage system (BESS) and fossil-fired conventional power plant opens up a range of different services for the grid and power plant operators, including black-start capability, grid services, opex optimization and new flexibility/enhanced generation capabilities.


Black start of a gas turbine on loss of off-site power and support to restore the grid

Generally, power plants use small diesel generators to start turbines, or to provide power references such as voltage and frequency to allow renewable power generators to reconnect. Due to its speed of response as well as advanced control, SIESTART can be used as an alternative to a black start diesel generator. Therefore, batteries support the decarbonization by replacing CO2-emitting Diesel-Engines. It saves time and improves reliability while helping you boost revenues. SIESTART can also provide the necessary short-circuit power to ensure a given protection sequence.


Increasing the power gradient of the supply to the grid on start-up or ramp-up of the power plant

Run-up and start-up of a gas turbine require time. However, even the fastest and most flexible power plants are still too slow to respond to grid fluctuations within a matter of seconds and almost impossible to respond to demand down-turn situations. Depending on the scale of the battery energy storage system (BESS), it can immediately supply power to the grid and absorb power from the grid and can therefore fully or at least partially take over this activity for a brief period. In this mode of operation the BESS would supply power to the grid while the gas turbine is ramping up. The battery energy storage system continues to supply power to the grid until the gas turbine takes over and the battery can then be recharged (if needed).


Provision of regulating capacity with the power plant from cold start or in operation

The provision of regulation capability using battery energy storage system (BESS) is significantly faster (< 1 sec) and much more precise than what can be accomplished with a fossil-fired power plant. Power plant operators can generate additional business opportunities by offering this regulation capacity, and operating the plant with more flexibility. On simultaneous implementation of the BESS and the gas turbine, the battery assumes the task of fast response (both positive and negative), while the gas turbine only supplies the energy to deliver extended service requirements and balance the battery charge level. Such an optimized operating mode significantly reduces the stress on the gas turbine such as fuel and maintenance costs.


Ramp-up and ramp-down support

The battery energy storage system (BESS) supports the gas turbine in accelerating output adjustment and stabilization/smoothing of volatile load. BESS can already supply energy before and during gas turbine startup, therefore the overall energy output of the power plant to the grid can be significantly accelerated to respond to sudden load changes.


Offering up to rated-power plant output and maintaining spinning reserve with the SIESTART battery energy storage system (BESS)

Should spinning reserve be required to respond to large grid under-frequency, the BESS can be used to temporarily increase the maximum power output of the power plant at the POI. The otherwise permanently restricted output from the power plant can then by circumvented, and therefore offering power generation capacity up to rated output opens up additional revenue opportunities.


Improve partial load behaviour of gas turbines by storing excess energy into the battery 

When the grid is saturated with electricity, the output of conventional power plants needs to be decreased. The consequence: decreased turbine efficiency and higher emissions, especially carbon monoxide. BESS avoids these issues by storing excess energy allowing the turbine to operate at suitable partial load behaviour.


Stabilization of gas and steam turbines during grid outages as well as safe transition of the power plant to island mode

The most important objectives in stabilizing gas and steam turbines on grid outages are thus to limit the speed increase as well as to maintain turbine operation at the auxiliary power requirement or in island mode. On disconnection from the grid, the excess energy in the rotating system must be removed through the generator as electrical energy and input to/stored in the battery energy storage system (BESS). This significantly reduces the acceleration and thus the speed increase. Conflicting oscillations between the BESS and the turbine are not anticipated, because the battery energy storage system operates in power-controlled mode and the turbine in speed control.

Improve performance in power plant operation

SPPA-T3000 control system - flexible integration of BESS System into any OEM power plant

The reliability and predictability of power plant operation greatly depends on the control room operator’s ability to take the right action at the right time. SPPA-T3000 is specifically tailored to the operator’s tasks and requirements. An intuitive and safe operation, ergonomic design, and adaptability to the needs of your company support the operator during daily routines as well as during critical situations. This improves operator effectiveness and efficiency – and directly affects the availability of your entire plant’s operations.
Energy stories

Setting sail to efficient floating power

With SeaFloat, our engineers have created a trailblazing, highly efficient floating power plant on a mobile, self-supporting barge equipped with a SIESTART Battery Energy Storage Solution. Get to know the team behind the project Estrella del Mar III in the Domenican Republic.

Comprehensive experience

Count on an integrated solution from power plant experts

Siemens is the world leader in flexible power generation for the changing demands of grids. The ability to combine the high performance of a conventional power plant with the instantaneous response of a battery energy storage system makes our solution ideal for many use cases, maybe even yours. Put your trust in a partner that knows the power business and power technologies inside and out.

The solution in practical operation

Why to invest in a new technology? Siemens Energy has combined conventional power generation with an energy battery storage system in different use cases.

Benefit now

Boost your plant’s possibilities

Conventional energy suppliers increasingly face the challenge of having to respond as quickly as possible to load fluctuations. SIESTART provides the ideal solution, offering more flexible and more cost-effective power station operation – with capacity at the push of a button. Using state-of-the-art energy storage systems, conventional power stations can be ramped up and down more quickly, and used as a more targeted comprehensive solution – even for black starts when necessary.