Table E1.  Estimated Primary Energy Consumption in the United States, Selected Years, 1635-1945                       (Quadrillion Btu)
Year	Fossil Fuels				Renewable Energy				Electricity Net Imports	Total
	Coal	Natural Gas	Petroleum	Total	Conventional Hydroelectric Power	Biomass		Total
						Wood 1
1635	NA	– –	– –	NA	– –	(s)		(s)	– –	(s)
1645	NA	– –	– –	NA	– –	0.001		0.001	– –	0.001
1655	NA	– –	– –	NA	– –	.002		.002	– –	.002
1665	NA	– –	– –	NA	– –	.005		.005	– –	.005
1675	NA	– –	– –	NA	– –	.007		.007	– –	.007
1685	NA	– –	– –	NA	– –	.009		.009	– –	.009
1695	NA	– –	– –	NA	– –	.014		.014	– –	.014
1705	NA	– –	– –	NA	– –	.022		.022	– –	.022
1715	NA	– –	– –	NA	– –	.037		.037	– –	.037
1725	NA	– –	– –	NA	– –	.056		.056	– –	.056
1735	NA	– –	– –	NA	– –	.080		.080	– –	.080
1745	NA	– –	– –	NA	– –	.112		.112	– –	.112
1755	NA	– –	– –	NA	– –	.155		.155	– –	.155
1765	NA	– –	– –	NA	– –	.200		.200	– –	.200
1775	NA	– –	– –	NA	– –	.249		.249	– –	.249
1785	NA	– –	– –	NA	– –	.310		.310	– –	.310
1795	NA	– –	– –	NA	– –	.402		.402	– –	.402
1805	NA	– –	– –	NA	– –	.537		.537	– –	.537
1815	NA	– –	– –	NA	– –	.714		.714	– –	.714
1825	NA	– –	– –	NA	– –	.960		.960	– –	.960
1835	NA	– –	– –	NA	– –	1.305		1.305	– –	1.305
1845	NA	– –	– –	NA	– –	1.757		1.757	– –	1.757
1850	0.219	– –	– –	0.219	– –	2.138		2.138	– –	2.357
1855	.421	– –	– –	.421	– –	2.389		2.389	– –	2.810
1860	.518	– –	0.003	.521	– –	2.641		2.641	– –	3.162
1865	.632	– –	.010	.642	– –	2.767		2.767	– –	3.409
1870	1.048	– –	.011	1.059	– –	2.893		2.893	– –	3.952
1875	1.440	– –	.011	1.451	– –	2.872		2.872	– –	4.323
1880	2.054	– –	.096	2.150	– –	2.851		2.851	– –	5.001
1885	2.840	0.082	.040	2.962	– –	2.683		2.683	– –	5.645
1890	4.062	.257	.156	4.475	0.022	2.515		2.537	– –	7.012
1895	4.950	.147	.168	5.265	.090	2.306		2.396	– –	7.661
1900	6.841	.252	.229	7.322	.250	2.015		2.265	– –	9.587
1905	10.001	.372	.610	10.983	.386	1.843		2.229	– –	13.212
1910	12.714	.540	1.007	14.261	.539	1.765		2.304	– –	16.565
1915	13.294	.673	1.418	15.385	.659	1.688		2.347	0.002	17.734
1920	15.504	.813	2.676	18.993	.738	1.610		2.348	.003	21.344
1925	14.706	1.191	4.280	20.177	.668	1.533		2.201	.004	22.382
1930	13.639	1.932	5.897	21.468	.752	1.455		2.207	.005	23.680
1935	10.634	1.919	5.675	18.228	.806	1.397		2.203	.005	20.436
1940	12.535	2.665	7.760	22.960	.880	1.358		2.238	.007	25.205
1945	15.972	3.871	10.110	29.953	1.442	1.261	[1]	2.703	.009	32.665
1There is a discontinuity in the "Wood" time series between 1945 and 1949.  Through 1945, data are for fuelwood only; beginning in 1949, data are for wood and wood-derived fuels (see Table 10.1). Notes:  ·  For years not shown, there are no data available.  ·  See Tables 1.3 and 10.1 for continuation of these data series from 1949 forward.  ·  See Note, "Geographic Coverage of Statistics for 1635-1945," at end of section. NA=Not available.  – – = Not applicable.  (s)=Less than 0.0005 quadrillion Btu.   Sources:  Coal, Natural Gas, and Petroleum:  Energy in the American Economy, 1850-1975, Table VII.  Conventional Hydroelectric Power:  Energy in the American Economy, 1850-1975, Table II.  Wood: ·  1635-1845:  U.S. Department of Agriculture Circular No. 641, Fuel Wood Used in the United States 1630-1930, February 1942.  This source estimates fuelwood consumption in cords per decade, which were converted to Btu using the conversion factor of 20 million Btu per cord.  The annual average value for each decade was assigned to the fifth year of the decade on the assumption that annual use was likely to increase during any given decade and the average annual value was more likely to reflect mid-decade yearly consumption than use at either the beginning or end of the decade.  Values thus begin in 1635 and are plotted at 10-year intervals.  ·  1850-1945:  Energy in the American Economy, 1850-1975, Table VII.  Electricity Net Imports:  Energy in the American Economy, 1850-1975, Tables I and VI.  Calculated as the difference between hydroelectric consumption and hydroelectric production times 3,412 Btu per kilowatthour.