Project: Norwegian Wind Atlas		Customer: NVE/ENOVA		Revision: 2.0.0
	Scenario: Nord-Trøndelag 1		User: VECTOR AS		Date : 30.04.01 11:00

+	Wind Resources in Nord-Trøndelag 1

		Average wind speed
		The wind climate displays large seasonal variations. The average wind speed is presented for different averaging periods.
		Averaging period: Summer Year Spring Summer Autumn Winter
	.					.
	.			.		.			.
	.		Large picture	.		.		Large picture	.
		Fig. 1	Digital terrain model				Fig. 2	Wind speed at 50 meters height
			Measurement station					Averaging period: Summer
			Interpolated or translated
			measurement station
			Wind turbine(s)

	Area classification
	The total model area is: 629 km2 while the area above land is: 418 km2. The land area is classified in four groups according to the average wind speed at 50 meters height. The first and largest group cover the land area where the average wind speeds is above 6 m/s. The subsequent groups covers reduced areas as the average wind speed is increased to above 7 m/s, 8 m/s and 9 m/s.
	The suitability of an area for wind energy purposes depends on the size of high wind speed areas. Further it will be an advantage if the high wind speed areas are grouped or connected. Table 1 classifies areas according to minimum wind speed and minimum size of connected sub-areas.
	.		>6 m/s		.	>7 m/s		.	>8 m/s		.	>9 m/s		.
	> 0.04 km2		169.2	(40)		51.7	(12)		7.1	(1)		0.1	(0)
	> 0.10 km2		167.1	(39)		48.6	(11)		5.2	(1)		0.0	(0)
	> 0.50 km2		155.6	(37)		36.1	(8)		1.0	(0)		0.0	(0)
	> 1.00 km2		148.7	(35)		26.0	(6)		1.0	(0)		0.0	(0)
	Table 1.	Areas in km2 classified in groups according to minimum average wind speed and minimum size of connected sub-areas, number in brackets is the area in the group as a percentage of the total land area

	Energy production
	The maximum theoretical energy production from the total land area with wind speed above 6 m/s is: 1545 GWh /summer
	The energy production is based on an installed capacity of 15MW/km2. The installed capacity will only be obtained when the wind speed typically exceeds 12-13 m/s. For lower wind speeds a wind turbine produces its installed capacity only a fraction of the time, usually expressed as full load hours. The right figure gives the relation between full load hours and average wind speed used in the energy calculations in this study: Energy calculations.
	.		>6 m/s		.	>7 m/s		.	>8 m/s		.	>9 m/s		.
	> 0.04 km2		1545	(100)		582	(37)		95	(6)		1	(0)
	> 0.10 km2		1514	(97)		543	(35)		70	(4)		0	(0)
	> 0.50 km2		1375	(88)		396	(25)		13	(0)		0	(0)
	> 1.00 km2		1291	(83)		285	(18)		13	(0)		0	(0)
	Table 2.	Energy production in GWh/summer for an installed capacity of 15MW/km2, the number in brackets gives the produced energy as a percentage of the total possible energy production for the land area.

	Climatology
	The wind resources in the model is based on the following wind climatology(s):
		Buholmsråsa, external: Sør-Trøndelag 7
		Buholmsråsa and Rørvik interpolated (0.6 + 0.4)
		Rørvik translated, external: Nord-Trøndelag 2
	Particular comments: The wind speed may be slightly overestimated at the areas longest inland from the average coastline.
	General comments: Climatology