BEIJING, Nov 6 (AFP) - China is planning a drastic surge in Tibet's electrical and industrial output over the next 25 years in a bid to reduce political and economic problems in the impoverished region.

According to internal documents obtained by the London-based Tibet Information Network (TIN) and received here Wednesday, electricity supply in Tibet will witness a 23-fold increase by the year 2020, while secondary industry will expand 14 times its present size.

The documents, which have never been published, were drafted by the Tibetan regional government and provide the first details of the rapid industrialisation ordered by the Third Forum on Tibet a high-level policy session convened by the State Council in Beijing in 1994.

The forum called for immediate modernisation of the sensitive Himalayan region, arguing that overhauling an economy over-reliant on farming and herding would help promote political stability.

According to the plans obtained by TIN, electricity output will be doubled in the next five years alone, meaning a jump in average annual output growth from seven percent in the past decade to 17 percent.

The power supply increase is at the heart of a strategy which aims to boost secondary industrial output by an annual 15.5 percent in the next five years.

Secondary industry, which includes mining, processing and manufacturing, at present only accounts for 15 percent of Tibet's gross domestic product (GDP) and has remained static in size for decades.

The plans also envisage a seven-fold increase by 2020 in Tibet's tertiary sector including tourism and services until it accounts for 50 percent of the region's GDP.

Tibet's energy plans are largely dependent on on the success of current attempts to relaunch the Yamdrok Tso hydro-project 100 kilometers (60 miles) southwest of Lhasa, which will have an installed capacity of 90 megawatts when completed.

The project was put years behind schedule after a major tunnel collapsed in 1995.