Botol Bati (Solar Bottle Light)

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Botol Bati (Solar Bottle Light)

By ChangeBDIn standard22nd October, 2015

Project Overview:

With the support and guidance from GIZ’s (German Development Cooperation) Sustainable Development for Energy (SED) Programme, CHANGE, a youth based community and development organization implemented the project of Solar Bottle Light from April to August, 2013 to improve the energy efficiency of the Baonea-badh slum of Mirpur, Dhaka to identify the demand of daytime lighting and its necessity for inclusive development.

Botol Bati logo

Approach of the Project:

The main objective of the five months pilot project (April-August, 2013) is to introduce the locally customized solar bottle light technology in Baonea-badh slum area, Dhaka, Bangladesh to evaluate its applicability and social acceptance, and identify its impacts scientifically to understand its further prospect. This project will not only reduce the misuse of electricity from daytime lighting but will also reduce CO2 emission significantly by ensuring proper daytime lighting facility for the underprivileged people. Also this project tried to identify the socio-economic benefits and the limitations of the bottle light for further development. Botol Bati was constructed using empty bottles, tin sheds (1 ft by 1ft), silicon glue, chlorine, clean water are required and it produces at least 60 watts of equivalent light. So far through this initiative 250 bottles have been installed and saved around 8.24 MW of electricity/month. Under this initiative 250 families are benefitted at the Baonea-badh slum in Mirpur.

Project Impact:

  1. Energy Conservation: Installing the bottle lights, electricity demand from daytime lighting has been significantly reduced to 83.3% (N=250). According to the estimation, the project is going to save approximately 98.84 MW electricity per year through energy efficiency improvement, contributing a significant amount of electricity to the national grid.
  2. Carbon emission reduction: The project of Baonea-badh is reducing 8.24 MW of electricity monthly which is simultaneously reducing CO2 emission. For the case of Bangladesh, per KWH electricity generation emits 513 grams CO2 (IEA, 2012). According to the project: Monthly reduction of CO2 emission is 424.15 kg and yearly it might reduce 5.08 metric tons CO2.
  3. Ensuring Sufficient Daytime Lighting during Power Outages: In summer season, very often we face 3-4 hours of power outage while the shanties embed darkness even at daytime. But bottle lights have proven to be the most innovative way of ensuring daylight equivalent to a 60-65W electrical bulb. This simple solution also ensures continuous light to meet daytime lighting demand throughout the day without any electrical bulbs. Before installing bottle lights, it has been observed that women make saris (a type of women’s cloth) by lighting candles even at day time because of insufficient light during power outages.
  4. Economic Benefits: a. Reduction in electricity bill and related cost; b. Helps to generate an additional income.
  5. Social and Other Benefits: Bottle light also helps to reduce the amount of insects and mosquitoes inside the room during day time. The presence of sunlight prevents any kind of insect breeding. Therefore bottle light creates a better and healthier atmosphere for users.

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