asked the Secretary of State for Energy (1) what in his Depart- ment's estimate of the contribution which geothermal power will provide for United Kingdom power generation by (a) 1990, (b) 1995, (c) 2000;(2) what is his Department's estimate of the contribution which wind power will provide for United Kingdom power generation by (
a) 1990, ( b) 1995, ( c) 2000;
(3) what is his Department's estimate of the contribution which wave power will provide for United Kingdom power generation by ( a) 1990, ( b) 1995, and ( c) 2000;
(4) what is his Department's estimate of the contribution which tidal power will provide for United Kingdom power generation by ( a) 1990, ( b) 1995, and ( c) 2000;
(5) what is his Department's estimate of the contribution which solar energy will provide for United Kingdom power generation by ( a) 1990, ( b) 1995, and ( c) 2000.
Most renewable sources are at an early stage of development, and substantial further work is needed to establish their feasibility and reduce costs. As given in the Working Document on Energy Policy, maximum technically feasible contributions to enregy supplies from individual sources in the year 2000, if each were successfully developed, could be:
| Solar | |
| domestic space heating | 1 mtce |
| domestic water heating | 4 mtce |
| fuel from plant materials | 3 mtce |
| Waves | up to 15 mtce |
| Winds | up to 8 mtce |
| Tidal | up to 4 mtce |
| Geothermal | up to 4 mtce |
| (mtce—million tons of coal equivalent) | |