Madrid, Spain --- (METERING.COM) --- October 1, 2008 - Spanish utility Endesa has presented proposals to reduce energy consumption by more than 30 percent in households and 40 percent in the lighting sector.

The proposals, for micro-cogeneration and luminous flux regulation, were presented at the First International Fair and Conference on Bioclimatic Architecture, Sustainable Construction and Energy Efficiency in Buildings (Ecobuildings 2008) held in Zaragoza, Spain, last week.

At the same event Endesa also advocated the use of solar energy, both thermal and photovoltaic, in buildings, both for the savings offered using solar water heating as well as for the option of supplying electricity to the grid.

Micro-cogeneration allows the simultaneous production of electricity and useful heat, and the electricity can be injected directly into the distribution network and consumed at the point of generation, thereby reducing the transmission and distribution losses.

Endesa says the installation of micro-cogeneration equipment in a new residential development of 97 units of 40 m2 would require an investment of 140,000 euros, which is marginal in terms of the total cost of the development. Such an investment would achieve an annual energy saving of more than 30 percent, with a saving of 71,000 kWh in primary energy, and would generate 24.75 MWh of electricity, providing an income of 3,205 euros a year to the community. In addition 15 tonnes of CO2 emissions per year would be avoided – the equivalent of that emitted by five vehicles.

The key for the viability of this type of project is high, constant thermal energy demand throughout the year, Endesa says.