# Solar Power - Stage 4 (technology)

internal name `solar-power-mk04` · tier 9 (Utility science pack, [tier 9](https://factorio.kalzumeus.com/tier/9.md))
HTML page: https://factorio.kalzumeus.com/tech/solar-power-mk04/

## Cost

3300 units of (1 × [Utility science pack](https://factorio.kalzumeus.com/item/utility-science-pack.md), 2 × [pY science pack 4](https://factorio.kalzumeus.com/item/py-science-pack-4.md), 3 × [Production science pack](https://factorio.kalzumeus.com/item/production-science-pack.md), 6 × [pY science pack 3](https://factorio.kalzumeus.com/item/py-science-pack-3.md), 10 × [Chemical science pack](https://factorio.kalzumeus.com/item/chemical-science-pack.md), 20 × [pY science pack 2](https://factorio.kalzumeus.com/item/py-science-pack-2.md), 30 × [Logistic science pack](https://factorio.kalzumeus.com/item/logistic-science-pack.md), 60 × [pY science pack 1](https://factorio.kalzumeus.com/item/py-science-pack-1.md), 100 × [Automation science pack](https://factorio.kalzumeus.com/item/automation-science-pack.md), 20 × [Military science pack](https://factorio.kalzumeus.com/item/military-science-pack.md)), 600 s each.

## Requires (2)

- [Renewables - Stage 4](https://factorio.kalzumeus.com/tech/renewable-mk04.md)
- [Utility science pack](https://factorio.kalzumeus.com/tech/utility-science-pack.md)

## Leads to (2)

- [Photovoltaic - Stage 4](https://factorio.kalzumeus.com/tech/solar-mk04.md)
- [Thermosolar Power - Stage 4](https://factorio.kalzumeus.com/tech/thermal-mk04.md)

## Unlocks (2 recipes)

### Pressurized steam (`he-04`)

- 2.5 s · tier 8
- Ingredients: 100 × [Hot Molten Salt](https://factorio.kalzumeus.com/fluid/hot-molten-salt.md) (≥3950°C), 75 × [Pressurized water](https://factorio.kalzumeus.com/fluid/pressured-water.md)
- Results: 100 × [Molten Salt](https://factorio.kalzumeus.com/fluid/molten-salt.md), 75 × [Pressurized steam](https://factorio.kalzumeus.com/fluid/pressured-steam.md) (4000°C)
- Made in: Heat exchanger MK01, Heat exchanger MK02, Heat exchanger MK03, Heat exchanger MK04
- Unlocked by: [Biomass Power - Stage 4](https://factorio.kalzumeus.com/tech/biomassplant-mk04.md), [Coal Power - Stage 4](https://factorio.kalzumeus.com/tech/coalplant-mk04.md), [Gas Power - Stage 4](https://factorio.kalzumeus.com/tech/gasplant-mk04.md), [Oil Power - Stage 4](https://factorio.kalzumeus.com/tech/oilplant-mk04.md), [Solar Power - Stage 4](https://factorio.kalzumeus.com/tech/solar-power-mk04.md)

### Pressurized steam (`he-05`)

- 2.5 s · tier 8
- Ingredients: 100 × [Hot Molten Salt](https://factorio.kalzumeus.com/fluid/hot-molten-salt.md) (≥4950°C), 75 × [Pressurized water](https://factorio.kalzumeus.com/fluid/pressured-water.md)
- Results: 100 × [Molten Salt](https://factorio.kalzumeus.com/fluid/molten-salt.md), 75 × [Pressurized steam](https://factorio.kalzumeus.com/fluid/pressured-steam.md) (5000°C)
- Made in: Heat exchanger MK01, Heat exchanger MK02, Heat exchanger MK03, Heat exchanger MK04
- Unlocked by: [Non Renewables - Stage 4](https://factorio.kalzumeus.com/tech/nonrenewable-mk04.md), [Solar Power - Stage 4](https://factorio.kalzumeus.com/tech/solar-power-mk04.md)