# Energy storage

> Energy storage is jouleWise's electricity solution: batteries and thermal stores that make contracted energy usable.

Canonical: https://joulewise.com/solutions/energy-storage  
Publisher: jouleWise Advisory Services Pvt Ltd, Noida, India · Spain  
Reviewed: 2026-10-08  
Status: company page

## In short

Battery storage for block matching, peak shaving and ride-through; thermal storage so heat is made when electricity is cheapest. Neither creates energy — both decide when you get to use it. Renewable generation arrives when the resource is available, not when the plant is consuming. Without somewhere to put it, surplus generation is spilled or banked on unfavourable terms while the plant imports at tariff hours later. Storage is what converts contracted capacity into consumed units.
## The problem

Renewable generation arrives when the resource is available, not when the plant is consuming. Without somewhere to put it, surplus generation is spilled or banked on unfavourable terms while the plant imports at tariff hours later. Storage is what converts contracted capacity into consumed units.

## What we do

- **Block matching.** Shift contracted generation into the fifteen-minute blocks where consumption actually sits. This is the job that raises renewable share rather than just capacity.
- **Peak shaving.** Cut the contract demand you are billed on and ride through the short peaks that set it.
- **Ride-through.** Hold critical utilities across a grid disturbance, where an outage costs a batch rather than an hour.
- **Thermal storage.** Hot water and higher-temperature stores charged in cheap blocks, discharged to process on demand — often a better return per rupee than an equivalent battery.

## Where it stops

- **Discharge cost decides it.** The number that matters is cost per kWh discharged over the asset's life, not capital cost per kWh installed. Cycle count, depth and degradation assumptions move it more than chemistry choice.
- **Arbitrage is not the case.** Charging cheap and discharging dear is real but modest, and the first return to disappear when spreads narrow. Storage justified on arbitrage alone tends to disappoint.
- **Sizing needs block data.** Storage sized against annual figures is guesswork. It is a block-by-block question and needs metered consumption at fifteen-minute resolution.

## What we need to start

- Fifteen-minute consumption data
- Contract demand and demand-charge structure
- Existing or planned renewable contracts
- Criticality of loads for ride-through
- Space, fire and safety constraints

## What drives the economics

- Cost per kWh discharged, across the assumed cycle life
- Demand charge avoided, where peak shaving applies
- Spill avoided on the renewable portfolio
- Cost of the alternative: importing at tariff in those blocks
## Facts

- Block matching: Shift contracted generation into the fifteen-minute blocks where consumption actually sits. This is the job that raises renewable share rather than just capacity.
- Peak shaving: Cut the contract demand you are billed on and ride through the short peaks that set it.
- Ride-through: Hold critical utilities across a grid disturbance, where an outage costs a batch rather than an hour.
- Thermal storage: Hot water and higher-temperature stores charged in cheap blocks, discharged to process on demand — often a better return per rupee than an equivalent battery.

## Assumptions and limits

- Discharge cost decides it. The number that matters is cost per kWh discharged over the asset's life, not capital cost per kWh installed. Cycle count, depth and degradation assumptions move it more than chemistry choice.
- Arbitrage is not the case. Charging cheap and discharging dear is real but modest, and the first return to disappear when spreads narrow. Storage justified on arbitrage alone tends to disappoint.
- Sizing needs block data. Storage sized against annual figures is guesswork. It is a block-by-block question and needs metered consumption at fifteen-minute resolution.

## Questions and answers

**Battery or thermal?**  
Whichever moves the constraint. If the problem is heat arriving at the wrong time, a thermal store is usually cheaper per unit shifted. If it is demand charges or electrical matching, a battery.

**How many cycles?**  
Modelling assumes 330 cycles a year for block matching. More aggressive cycling changes both the return and the degradation assumption, and both should be stated.

## Related

- [Explore BESS Studio](https://joulewise.com/studios/bess)
- [How you buy it](https://joulewise.com/engagement)

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