In the course of the G7 energy minister meeting 2015, the energy bunker („Energiebunker“) Hamburg was visited by ministry representatives from Canada, Japan, France, Italy, Great Britain, Germany and USA. During this, the innovative energy concept of the energy bunker operated by the local utilities HAMBURG ENERGIE GmbH was presented.
A central part of the concept is the cogeneration plant which has been commissioned in late 2013 (GG 530) and early 2016 (GG 237, installed after the meeting). The plant produces power and heat from biomethane with a combined nominal power of 771 kW electric and 1058 kW thermal. With over 90 %, its total efficiency is more than twice as much as the 40 % total efficiency of conventional power plants which blast the heat generated with the power production into the atmosphere.
The power generated from the CHP plant is fed into the Hamburg mains together with the solar power from the PV units mounted on the southern facade of the energy bunker. The CHP heat production is used together with the large solar collector on top of the energy bunker to heat the surrounding buildings. Excess heat is stored in a 2.000.000 litres buffer sorage which serves the counterbalancing of heat production and demand.
The energy bunker had originally been erected in 1943 by forced labour as an air defence bunker and, after decades of decay, has been transformed in 2011 – 2013 also into an anti-war monument with numerous information signs about its history. Today it’s part of the climate protection project „Renewable Wilhelmsburg“ which aims at a heat and power supply from 100 % renewable sources in the year 2050.
„We regard the increase of energy efficiency and the intensified deployment of technologies to utilize renewable energies (…) as important pillars of a secure and sustainable energy system“ is written in the communique of the G7 energy minister meeting which is submitted to the heads of the governments at the G7 summit in Elmau for decision. Projects like the energy bunker show how well the teamplay between highly efficient cogeneration with decentral CHP units and renewable energy sources can be put into practice.